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result sql = Redesign of carnitine acetyltransferase specificity by protein engineering.
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char = c;code = 99
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char = a;code = 97
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char = d;code = 100
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char = n;code = 110
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char = r;code = 114
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char = e;code = 101
char = d;code = 100
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char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
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char = t;code = 116
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char = w;code = 119
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = s;code = 115
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char = o;code = 111
char = r;code = 114
char = t;code = 116
char = -;code = 45
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
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char = s;code = 115
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char = ;code = 32
char = A;code = 65
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
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char = t;code = 116
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char = ;code = 32
char = M;code = 77
char = 5;code = 53
char = 6;code = 54
char = 4;code = 52
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = l;code = 108
char = u;code = 117
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = M;code = 77
char = e;code = 101
char = t;code = 116
char = 5;code = 53
char = 6;code = 54
char = 4;code = 52
char = ;code = 32
char = b;code = 98
char = l;code = 108
char = o;code = 111
char = c;code = 99
char = k;code = 107
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
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char = m;code = 109
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char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
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char = c;code = 99
char = h;code = 104
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
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char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = r;code = 114
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char = e;code = 101
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char = d;code = 100
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char = m;code = 109
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = o;code = 111
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char = a;code = 97
char = l;code = 108
char = ;code = 32
char = m;code = 109
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char = d;code = 100
char = e;code = 101
char = l;code = 108
char = s;code = 115
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char = o;code = 111
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char = ;code = 32
char = w;code = 119
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = -;code = 45
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = e;code = 101
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char = d;code = 100
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char = t;code = 116
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
char = T;code = 84
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = O;code = 79
char = T;code = 84
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = p;code = 112
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char = r;code = 114
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char = t;code = 116
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char = i;code = 105
char = s;code = 115
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char = h;code = 104
char = y;code = 121
char = p;code = 112
char = o;code = 111
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char = h;code = 104
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
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char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = s;code = 115
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char = t;code = 116
char = i;code = 105
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char = a;code = 97
char = b;code = 98
char = l;code = 108
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char = m;code = 109
char = i;code = 105
char = n;code = 110
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char = e;code = 101
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char = s;code = 115
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char = s;code = 115
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char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = s;code = 115
char = p;code = 112
char = e;code = 101
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char = T;code = 84
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = In eukaryotes, L-carnitine is involved in energy metabolism by facilitating beta-oxidation of fatty acids. Carnitine acetyltransferases (CrAT) catalyze the reversible conversion of acetyl-CoA and carnitine to acetylcarnitine and free CoA. To redesign the specificity of rat CrAT toward its substrates, we mutated Met564. The M564G mutated CRAT SHOWED HIGHER ACTIVITY TOWARD LONGER CHAIN ACYL-COAS: activity toward myristoyl-CoA was 1250-fold higher than that of the wild-type CrAT, and lower activity toward its natural substrate, acetyl-CoA. Kinetic constants of the mutant CrAT showed modification in favor of longer acyl-CoAs as substrates. In the reverse case, mutation of the orthologous glycine (Gly553) to methionine in carnitine octanoyltransferase (COT) decreased activity toward its natural substrates, medium- and long-chain acyl-CoAs, and increased activity toward short-chain acyl-CoAs. Another CrAT mutant, M564A, was prepared and tested in the same way, with similar results. We conclude that Met564 blocks the entry of medium- and long-chain acyl-CoAs to the catalytic site of CrAT. Three-dimensional models of wild-type and mutated CrAT and COT support this hypothesis. We show for the first time that a single amino acid is able to determine the substrate specificity of CrAT and COT.
char = e;code = 101
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = y;code = 121
char = l;code = 108
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = n;code = 110
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char = i;code = 105
char = n;code = 110
char = e;code = 101
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = .;code = 46
result sql = Redesign of carnitine acetyltransferase specificity by protein engineering.
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char = e;code = 101
char = u;code = 117
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char = a;code = 97
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char = s;code = 115
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char = r;code = 114
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char = i;code = 105
char = n;code = 110
char = e;code = 101
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char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = o;code = 111
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char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = e;code = 101
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char = e;code = 101
char = r;code = 114
char = g;code = 103
char = y;code = 121
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char = s;code = 115
char = m;code = 109
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char = b;code = 98
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char = a;code = 97
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char = a;code = 97
char = t;code = 116
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = i;code = 105
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char = C;code = 67
char = a;code = 97
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char = i;code = 105
char = t;code = 116
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char = n;code = 110
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char = C;code = 67
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char = T;code = 84
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char = c;code = 99
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char = a;code = 97
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
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char = s;code = 115
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
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char = c;code = 99
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char = i;code = 105
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char = t;code = 116
char = o;code = 111
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char = a;code = 97
char = c;code = 99
char = e;code = 101
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char = y;code = 121
char = l;code = 108
char = c;code = 99
char = a;code = 97
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char = i;code = 105
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = e;code = 101
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char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = f;code = 102
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char = e;code = 101
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char = C;code = 67
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char = .;code = 46
char = ;code = 32
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char = C;code = 67
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char = t;code = 116
char = o;code = 111
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char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = i;code = 105
char = t;code = 116
char = s;code = 115
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char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
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char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = e;code = 101
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char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = M;code = 77
char = e;code = 101
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char = 5;code = 53
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char = 4;code = 52
char = .;code = 46
char = ;code = 32
char = T;code = 84
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char = e;code = 101
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char = M;code = 77
char = 5;code = 53
char = 6;code = 54
char = 4;code = 52
char = G;code = 71
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char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = C;code = 67
char = R;code = 82
char = A;code = 65
char = T;code = 84
char = ;code = 32
char = S;code = 83
char = H;code = 72
char = O;code = 79
char = W;code = 87
char = E;code = 69
char = D;code = 68
char = ;code = 32
char = H;code = 72
char = I;code = 73
char = G;code = 71
char = H;code = 72
char = E;code = 69
char = R;code = 82
char = ;code = 32
char = A;code = 65
char = C;code = 67
char = T;code = 84
char = I;code = 73
char = V;code = 86
char = I;code = 73
char = T;code = 84
char = Y;code = 89
char = ;code = 32
char = T;code = 84
char = O;code = 79
char = W;code = 87
char = A;code = 65
char = R;code = 82
char = D;code = 68
char = ;code = 32
char = L;code = 76
char = O;code = 79
char = N;code = 78
char = G;code = 71
char = E;code = 69
char = R;code = 82
char = ;code = 32
char = C;code = 67
char = H;code = 72
char = A;code = 65
char = I;code = 73
char = N;code = 78
char = ;code = 32
char = A;code = 65
char = C;code = 67
char = Y;code = 89
char = L;code = 76
char = -;code = 45
char = C;code = 67
char = O;code = 79
char = A;code = 65
char = S;code = 83
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = w;code = 119
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = y;code = 121
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = o;code = 111
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = 1;code = 49
char = 2;code = 50
char = 5;code = 53
char = 0;code = 48
char = -;code = 45
char = f;code = 102
char = o;code = 111
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = -;code = 45
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
char = T;code = 84
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = w;code = 119
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = .;code = 46
char = ;code = 32
char = K;code = 75
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
char = T;code = 84
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = v;code = 118
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = o;code = 111
char = g;code = 103
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = g;code = 103
char = l;code = 108
char = y;code = 121
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = G;code = 71
char = l;code = 108
char = y;code = 121
char = 5;code = 53
char = 5;code = 53
char = 3;code = 51
char = );code = 41
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = c;code = 99
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = o;code = 111
char = y;code = 121
char = l;code = 108
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = C;code = 67
char = O;code = 79
char = T;code = 84
char = );code = 41
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = w;code = 119
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = -;code = 45
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = -;code = 45
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = w;code = 119
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = -;code = 45
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
char = T;code = 84
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ,;code = 44
char = ;code = 32
char = M;code = 77
char = 5;code = 53
char = 6;code = 54
char = 4;code = 52
char = A;code = 65
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = l;code = 108
char = u;code = 117
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = M;code = 77
char = e;code = 101
char = t;code = 116
char = 5;code = 53
char = 6;code = 54
char = 4;code = 52
char = ;code = 32
char = b;code = 98
char = l;code = 108
char = o;code = 111
char = c;code = 99
char = k;code = 107
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = -;code = 45
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = -;code = 45
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = C;code = 67
char = o;code = 111
char = A;code = 65
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
char = T;code = 84
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = -;code = 45
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = r;code = 114
char = A;code = 65
char = T;code = 84
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = O;code = 79
char = T;code = 84
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = p;code = 112
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
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char = ;code = 32
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
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result sql = In eukaryotes, L-carnitine is involved in energy metabolism by facilitating beta-oxidation of fatty acids. Carnitine acetyltransferases (CrAT) catalyze the reversible conversion of acetyl-CoA and carnitine to acetylcarnitine and free CoA. To redesign the specificity of rat CrAT toward its substrates, we mutated Met564. The M564G mutated CRAT SHOWED HIGHER ACTIVITY TOWARD LONGER CHAIN ACYL-COAS: activity toward myristoyl-CoA was 1250-fold higher than that of the wild-type CrAT, and lower activity toward its natural substrate, acetyl-CoA. Kinetic constants of the mutant CrAT showed modification in favor of longer acyl-CoAs as substrates. In the reverse case, mutation of the orthologous glycine (Gly553) to methionine in carnitine octanoyltransferase (COT) decreased activity toward its natural substrates, medium- and long-chain acyl-CoAs, and increased activity toward short-chain acyl-CoAs. Another CrAT mutant, M564A, was prepared and tested in the same way, with similar results. We conclude that Met564 blocks the entry of medium- and long-chain acyl-CoAs to the catalytic site of CrAT. Three-dimensional models of wild-type and mutated CrAT and COT support this hypothesis. We show for the first time that a single amino acid is able to determine the substrate specificity of CrAT and COT.
Publication: J. Biol. Chem. 2004 Aug 6 ;279(32)::33899-908.
Publication Date: 2004 Aug 6
Study Author(s): Cordente, Antonio G;López-Viñas, Eduardo;Vázquez, María Irene;Swiegers, Jan H;Pretorius, Isak S;Gómez-Puertas, Paulino;Hegardt, Fausto G;Asins, Guillermina;Serra, Dolors;
Institution: Department of Biochemistry and Molecular Biology, School of Pharmacy, University of Barcelona, Diagonal 643, E-08028 Barcelona, Spain.
Shortcut link to this study:
Publication Date: 2004 Aug 6
Study Author(s): Cordente, Antonio G;López-Viñas, Eduardo;Vázquez, María Irene;Swiegers, Jan H;Pretorius, Isak S;Gómez-Puertas, Paulino;Hegardt, Fausto G;Asins, Guillermina;Serra, Dolors;
Institution: Department of Biochemistry and Molecular Biology, School of Pharmacy, University of Barcelona, Diagonal 643, E-08028 Barcelona, Spain.
Shortcut link to this study:
In eukaryotes, L-carnitine is involved in energy metabolism by facilitating beta-oxidation of fatty acids. Carnitine acetyltransferases (CrAT) catalyze the reversible conversion of acetyl-CoA and carnitine to acetylcarnitine and free CoA. To redesign the specificity of rat CrAT toward its substrates, we mutated Met564. The M564G mutated CRAT SHOWED HIGHER ACTIVITY TOWARD LONGER CHAIN ACYL-COAS: activity toward myristoyl-CoA was 1250-fold higher than that of the wild-type CrAT, and lower activity toward its natural substrate, acetyl-CoA. Kinetic constants of the mutant CrAT showed modification in favor of longer acyl-CoAs as substrates. In the reverse case, mutation of the orthologous glycine (Gly553) to methionine in carnitine octanoyltransferase (COT) decreased activity toward its natural substrates, medium- and long-chain acyl-CoAs, and increased activity toward short-chain acyl-CoAs. Another CrAT mutant, M564A, was prepared and tested in the same way, with similar results. We conclude that Met564 blocks the entry of medium- and long-chain acyl-CoAs to the catalytic site of CrAT. Three-dimensional models of wild-type and mutated CrAT and COT support this hypothesis. We show for the first time that a single amino acid is able to determine the substrate specificity of CrAT and COT.
PMID: 15155769
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