EC Number   |
Protein Variants |
Reference |
|---|
    4.2.1.96 | C81R |
mutant enzyme Cys81Arg has significantly lower activity |
5932 |
| 4.2.1.96 | C82R |
mutant enzyme C82R reveals 60% decrease in Vmax and a slight decrease in Km-value for 4a-hydroxytetrahydrobiopterin. The susceptibility to proteolysis of mutant C82R, however is markedly increased compared with the wild type enzyme |
5936 |
| 4.2.1.96 | C82R |
mutant enzyme expressed as a soluble form has 40% of normal activity |
668883 |
| 4.2.1.96 | D100N |
the single mutants H73A and H74A and the double mutant H73A,H74A are completely inactive. The activity of the mutant enzymes H91A and E69A is 40% of the activity of the wild type enzyme. The activity of the mutant enzymes D100N is 10% of the activity of the wild type enzyme |
5929 |
| 4.2.1.96 | E57A |
the His79Ala mutant and the His79Ser mutant exhibit about 40% the activity of the wild-type enzyme. In the mutant enzymes His61Ala and His62Ala the activity is reduced to 10%. In the mutant enzymes Asp60Ala and Arg87Ala the activity is reduced to 30%. The Glu57Ala mutant and the His61Ala,His62Ala double mutant show no activity |
5933 |
| 4.2.1.96 | E69A |
the single mutants H73A and H74A and the double mutant H73A,H74A are completely inactive. The activity of the mutant enzymes H91A and E69A is 40% of the activity of the wild type enzyme. The activity of the mutant enzymes D100N is 10% of the activity of the wild type enzyme |
5929 |
| 4.2.1.96 | E97K |
a biopsy of duodenal mucosa from a patient with homozygous E97K mutation has 17% of normal activity |
668883 |
| 4.2.1.96 | H61A |
mutant enzyme H61A shows no dehydratase activity with 4a(R)-hydroxy-6(R)-methyltetrahydropterin. Mutant enzyme H79A shows no dehydratase activity with 4a(S)-hydroxy-6(R)-methyltetrahydropterin. The Km-value for 4a(S)-hydroxy-6(R)-methyltetrahydropterin is comparable to the Km-value of the wild type enzyme. The turnover number of the mutant enzyme H62A is 24% of that with the wild type enzyme for the 4a(R),6(S)-isomer and the 4a(S),6(R)-isomer |
5940 |
| 4.2.1.96 | H61A |
the His79Ala mutant and the His79Ser mutant exhibit about 40% the activity of the wild-type enzyme. In the mutant enzymes His61Ala and His62Ala the activity is reduced to 10%. In the mutant enzymes Asp60Ala and Arg87Ala the activity is reduced to 30%. The Glu57Ala mutant and the His61Ala,His62Ala double mutant show no activity |
5933 |
| 4.2.1.96 | H61A/H62A |
the His79Ala mutant and the His79Ser mutant exhibit about 40% the activity of the wild-type enzyme. In the mutant enzymes His61Ala and His62Ala the activity is reduced to 10%. In the mutant enzymes Asp60Ala and Arg87Ala the activity is reduced to 30%. The Glu57Ala mutant and the His61Ala,His62Ala double mutant show no activity |
5933 |
