char = C;code = 67
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
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 = d;code = 100
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = r;code = 114
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 = 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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = B;code = 66
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
result sql = Change of the donor substrate specificity of Clostridium difficile toxin B by site-directed mutagenesis.
Change of the donor substrate specificity of Clostridium difficile toxin B by site-directed mutagenesis.
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = g;code = 103
char = l;code = 108
char = y;code = 121
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = y;code = 121
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = G;code = 71
char = T;code = 84
char = P;code = 80
char = a;code = 97
char = s;code = 115
char = e;code = 101
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 = R;code = 82
char = h;code = 104
char = o;code = 111
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = l;code = 108
char = y;code = 121
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = A;code = 65
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = B;code = 66
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = r;code = 114
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = i;code = 105
char = i;code = 105
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = U;code = 85
char = D;code = 68
char = P;code = 80
char = -;code = 45
char = g;code = 103
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = g;code = 103
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = y;code = 121
char = l;code = 108
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 = R;code = 82
char = h;code = 104
char = o;code = 111
char = /;code = 47
char = R;code = 82
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = G;code = 71
char = T;code = 84
char = P;code = 80
char = a;code = 97
char = s;code = 115
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 = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = -;code = 45
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = v;code = 118
char = y;code = 121
char = i;code = 105
char = ;code = 32
char = N;code = 78
char = -;code = 45
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 = g;code = 103
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = y;code = 121
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = R;code = 82
char = h;code = 104
char = o;code = 111
char = ;code = 32
char = G;code = 71
char = T;code = 84
char = P;code = 80
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = U;code = 85
char = D;code = 68
char = P;code = 80
char = -;code = 45
char = N;code = 78
char = -;code = 45
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 = g;code = 103
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = r;code = 114
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 = 46
char = ;code = 32
char = B;code = 66
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = .;code = 46
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = B;code = 66
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = g;code = 103
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = r;code = 114
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 = 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 = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = t;code = 116
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = I;code = 73
char = l;code = 108
char = e;code = 101
char = -;code = 45
char = 3;code = 51
char = 8;code = 56
char = 3;code = 51
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = G;code = 71
char = l;code = 108
char = n;code = 110
char = -;code = 45
char = 3;code = 51
char = 8;code = 56
char = 5;code = 53
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = B;code = 66
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = y;code = 121
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 = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = U;code = 85
char = D;code = 68
char = P;code = 80
char = -;code = 45
char = N;code = 78
char = -;code = 45
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 = g;code = 103
char = l;code = 108
char = u;code = 117
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = g;code = 103
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = R;code = 82
char = h;code = 104
char = o;code = 111
char = A;code = 65
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = K;code = 75
char = (;code = 40
char = m;code = 109
char = );code = 41
char = ;code = 32
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 9;code = 57
char = 6;code = 54
char = 0;code = 48
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 2;code = 50
char = 6;code = 54
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = m;code = 109
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 = d;code = 100
char = o;code = 111
char = u;code = 117
char = b;code = 98
char = l;code = 108
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 = 46
char = ;code = 32
char = A;code = 65
char = c;code = 99
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = l;code = 108
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = i;code = 105
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result sql = The large cytotoxins of Clostridia species glycosylate and thereby inactivate small GTPases of the Rho family. Clostridium difficile toxins A and B and Clostridium sordellii lethal toxin use UDP-glucose as the donor for glucosylation of Rho/Ras GTPases. In contrast, alpha-toxin from Clostridium novyi N-acetylglucosaminylates Rho GTPases by using UDP-N-acetylglucosamine as a donor substrate. Based on the crystal structure of C. difficile toxin B, we studied the sugar donor specificity of the toxins by site-directed mutagenesis. The changing of Ile-383 and Gln-385 in toxin B to serine and alanine, respectively, largely increased the acceptance of UDP-N-acetylglucosamine as a sugar donor for modification of RhoA. The K(m) value was reduced from 960 to 26 mum for the double mutant. Accordingly, the potential of the double mutant of toxin B to hydrolyze UDP-N-acetylglucosamine was higher than that for UDP-glucose. The changing of Ile-383 and Gln-385 in the lethal toxin of C. sordellii allowed modification of Ras in the presence of UDP-N-acetyl-glucosamine and reduced the acceptance of UDP-glucose as a donor for glycosylation. Vice versa, the changing of the equivalent residues in C. novyi alpha-toxin from Ser-385 and Ala-387 to isoleucine and glutamine, respectively, reversed the donor specificity of the toxin from UDP-N-acetylglucosamine to UDP-glucose. These data demonstrate that two amino acid residues are crucial for the co-substrate specificity of clostridial glycosylating toxins.

Publication: J. Biol. Chem. 2005 Nov 11 ;280(45)::37833-8.
Publication Date: 2005 Nov 11
Study Author(s): Jank, Thomas;Reinert, Dirk J;Giesemann, Torsten;Schulz, Georg E;Aktories, Klaus;
Institution: Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Freiburg, Germany.
Shortcut link to this study:
The large cytotoxins of Clostridia species glycosylate and thereby inactivate small GTPases of the Rho family. Clostridium difficile toxins A and B and Clostridium sordellii lethal toxin use UDP-glucose as the donor for glucosylation of Rho/Ras GTPases. In contrast, alpha-toxin from Clostridium novyi N-acetylglucosaminylates Rho GTPases by using UDP-N-acetylglucosamine as a donor substrate. Based on the crystal structure of C. difficile toxin B, we studied the sugar donor specificity of the toxins by site-directed mutagenesis. The changing of Ile-383 and Gln-385 in toxin B to serine and alanine, respectively, largely increased the acceptance of UDP-N-acetylglucosamine as a sugar donor for modification of RhoA. The K(m) value was reduced from 960 to 26 mum for the double mutant. Accordingly, the potential of the double mutant of toxin B to hydrolyze UDP-N-acetylglucosamine was higher than that for UDP-glucose. The changing of Ile-383 and Gln-385 in the lethal toxin of C. sordellii allowed modification of Ras in the presence of UDP-N-acetyl-glucosamine and reduced the acceptance of UDP-glucose as a donor for glycosylation. Vice versa, the changing of the equivalent residues in C. novyi alpha-toxin from Ser-385 and Ala-387 to isoleucine and glutamine, respectively, reversed the donor specificity of the toxin from UDP-N-acetylglucosamine to UDP-glucose. These data demonstrate that two amino acid residues are crucial for the co-substrate specificity of clostridial glycosylating toxins.
PMID: 16157585

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