char = O;code = 79
char = n;code = 110
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 = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = t;code = 116
char = u;code = 117
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 = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = k;code = 107
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = C;code = 67
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = a;code = 97
char = ;code = 32
char = z;code = 122
char = o;code = 111
char = f;code = 102
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = z;code = 122
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = o;code = 111
char = s;code = 115
char = y;code = 121
char = n;code = 110
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 = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = x;code = 120
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = .;code = 46
result sql = One amino acid substitution in phytoene desaturase makes Chlorella zofingiensis resistant to norflurazon and enhances the biosynthesis of astaxanthin.
One amino acid substitution in phytoene desaturase makes Chlorella zofingiensis resistant to norflurazon and enhances the biosynthesis of astaxanthin.
char = A;code = 65
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = a;code = 97
char = ;code = 32
char = z;code = 122
char = o;code = 111
char = f;code = 102
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = s;code = 115
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 = (;code = 40
char = E;code = 69
char = 1;code = 49
char = 7;code = 55
char = );code = 41
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
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 = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
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 = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = t;code = 116
char = h;code = 104
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = x;code = 120
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = o;code = 111
char = s;code = 115
char = y;code = 121
char = n;code = 110
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 = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = T;code = 84
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 = E;code = 69
char = 1;code = 49
char = 7;code = 55
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
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 = c;code = 99
char = o;code = 111
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = i;code = 105
char = d;code = 100
char = s;code = 115
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 = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
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 = 0;code = 48
char = .;code = 46
char = 2;code = 50
char = 5;code = 53
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = M;code = 77
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = z;code = 122
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = t;code = 116
char = h;code = 104
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 = 32
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = W;code = 87
char = T;code = 84
char = );code = 41
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = o;code = 111
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = i;code = 105
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = -;code = 45
char = l;code = 108
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = r;code = 114
char = r;code = 114
char = a;code = 97
char = d;code = 100
char = i;code = 105
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 = 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 = e;code = 101
char = ,;code = 44
char = ;code = 32
char = E;code = 69
char = 1;code = 49
char = 7;code = 55
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = 4;code = 52
char = 4;code = 52
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = 3;code = 51
char = 6;code = 54
char = %;code = 37
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = x;code = 120
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = W;code = 87
char = T;code = 84
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = z;code = 122
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = i;code = 105
char = n;code = 110
char = t;code = 116
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 = (;code = 40
char = C;code = 67
char = -;code = 45
char = T;code = 84
char = );code = 41
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 = v;code = 118
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = o;code = 111
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = r;code = 114
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 = P;code = 80
char = D;code = 68
char = S;code = 83
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = E;code = 69
char = 1;code = 49
char = 7;code = 55
char = ,;code = 44
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = n;code = 110
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 = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = L;code = 76
char = 5;code = 53
char = 1;code = 49
char = 6;code = 54
char = F;code = 70
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = T;code = 84
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 = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = P;code = 80
char = D;code = 68
char = S;code = 83
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = 3;code = 51
char = 1;code = 49
char = -;code = 45
char = f;code = 102
char = o;code = 111
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = z;code = 122
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = W;code = 87
char = T;code = 84
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
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result sql = A stable Chlorella zofingiensis mutant (E17) produced by chemical mutagen was characterized with respect to growth, astaxanthin biosynthesis, and phytoene desaturation. The mutant E17 could grow well and produce normal levels of colored carotenoids in the presence of 0.25 microM norflurazon, in which the growth of wild type (WT) cells was greatly limited due to inhibited carotenoid formation. Induced by high-light irradiation or glucose, E17 produced 44 or 36% more astaxanthin than WT when cultured in media without norflurazon. A point mutation (C-T) was revealed to occur in the PDS gene of E17, leading to an amino acid change (L516F) in its coding region. The mutated PDS exhibited 31-fold resistance to norflurazon when compared to WT as determined by an in vitro assay. Surprisingly, the mutated PDS exhibited higher efficiency in converting phytoene to zeta-carotene. No difference in PDS transcripts was found between E17 and WT cells cultured either in normal or induced conditions. In contrast, higher transcript levels of beta-carotene ketolase and hydroxylase were found in the E17 cells. Taken together, we conclude that a point mutation in Chlorella PDS gene makes E17 resistant to norflurazon and synthesize higher amounts of carotenoids including astaxanthin.

Publication: Planta 2010 Jun ;232(1)::61-7. :doi: 10.1007/s00425-010-1132-y.
Publication Date: 2010 Jun
Study Author(s): Liu, Jin;Zhong, Yujuan;Sun, Zheng;Huang, Junchao;Jiang, Yue;Sandmann, Gerhard;Chen, Feng;
Institution: School of Biological Science, The University of Hong Kong, Hong Kong, China.
Shortcut link to this study:
A stable Chlorella zofingiensis mutant (E17) produced by chemical mutagen was characterized with respect to growth, astaxanthin biosynthesis, and phytoene desaturation. The mutant E17 could grow well and produce normal levels of colored carotenoids in the presence of 0.25 microM norflurazon, in which the growth of wild type (WT) cells was greatly limited due to inhibited carotenoid formation. Induced by high-light irradiation or glucose, E17 produced 44 or 36% more astaxanthin than WT when cultured in media without norflurazon. A point mutation (C-T) was revealed to occur in the PDS gene of E17, leading to an amino acid change (L516F) in its coding region. The mutated PDS exhibited 31-fold resistance to norflurazon when compared to WT as determined by an in vitro assay. Surprisingly, the mutated PDS exhibited higher efficiency in converting phytoene to zeta-carotene. No difference in PDS transcripts was found between E17 and WT cells cultured either in normal or induced conditions. In contrast, higher transcript levels of beta-carotene ketolase and hydroxylase were found in the E17 cells. Taken together, we conclude that a point mutation in Chlorella PDS gene makes E17 resistant to norflurazon and synthesize higher amounts of carotenoids including astaxanthin.
PMID: 20221629

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