Thermostable mutants of pyrroloquinoline quinone dependent glucose dehydrogenase
First Claim
Patent Images
1. An isolated mutant protein of PQQ-dependent s-GDH, said mutant having at least 89% sequence identity with the A. calcoaceticus s-GDH wild-type sequence (SEQ ID NO:
- 2) and characterized in that in at least one of the positions 122 and 124 the amino acid lysine is present, wherein these positions correspond to the amino acid positions known from the A. calcoaceticus s-GDH wild-type sequence (SEQ ID NO;
2).
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a mutant protein of PQQ-dependent s-GDH characterized in that in at least one of the positions 122 and 124 the amino acid lysine is present, wherein these positions correspond to the amino acid positions known from the A. calcoaceticus s-GDH wild-type sequence (SEQ ID NO: 2), it also discloses genes encoding such mutant s-GDH, and different applications of these s-GDH mutants, particularly for determining the concentration of glucose in a sample.
4 Citations
23 Claims
-
1. An isolated mutant protein of PQQ-dependent s-GDH, said mutant having at least 89% sequence identity with the A. calcoaceticus s-GDH wild-type sequence (SEQ ID NO:
- 2) and characterized in that in at least one of the positions 122 and 124 the amino acid lysine is present, wherein these positions correspond to the amino acid positions known from the A. calcoaceticus s-GDH wild-type sequence (SEQ ID NO;
2). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- 2) and characterized in that in at least one of the positions 122 and 124 the amino acid lysine is present, wherein these positions correspond to the amino acid positions known from the A. calcoaceticus s-GDH wild-type sequence (SEQ ID NO;
-
17. An isolated mutant protein of PQQ-dependent s-GDH comprising a sequence that differs from SEQ ID NO:
- 2 by 20 or less amino acid substitutions and/or insertions and includes an amino acid substitution at position 122, (relative to SEQ ID NO;
2), and optionally one or more additional amino acid substitutions, relative to the sequence of SEQ ID NO;
2, at positions selected from the group consisting of positions 16, 22, 65, 76, 116, 120, 124, 127, 143, 168, 169, 171, 177, 224, 227, 230, 231, 245, 246, 255, 277, 287, 294, 295, 299, 302, 305, 307, 308, 317, 321, 323, 341, 348, 349, 354, 355, 364, 378, 422, 425, 426, 428, 430 and 438, and an optional insertion of proline at position 429, wherein at least one of positions 122 or 124 is substituted with the amino acid lysine, wherein said mutant has at least a two-fold improved substrate specificity for glucose as compared to one other selected sugar substrate and a thermo stability that is at least 20% of the thermo stability as measured for the wild-type enzyme. - View Dependent Claims (18, 19, 20, 21, 22, 23)
- 2 by 20 or less amino acid substitutions and/or insertions and includes an amino acid substitution at position 122, (relative to SEQ ID NO;
Specification