Site‐directed mutagenesis of the formate dehydrogenase active centre: role of the His332‐Gln313 pair in enzyme catalysis

Site‐directed mutagenesis of the formate dehydrogenase active centre: role of the His332‐Gln313 pair in enzyme catalysis Научная публикация

Журнал

FEBS Letters
ISSN: 0014-5793 , E-ISSN: 1873-3468

Вых. Данные

Год: 1996, Том: 390, Номер: 1, Страницы: 104-108 Страниц : 5 DOI: 10.1016/0014-5793(96)00641-2

Авторы

Tishkov Vladimir I. ¹ , Matorin Andrey D. ¹ , Rojkova Alexandra M. ¹ , Fedorchuk Vladimir V. ¹ , Savitsky Pavel A. ¹ , Dementieva Larissa A. ¹ , Lamzin Victor S. ² , Mezentzev Alexander V. ³ , Popov Vladimir O. ³

Организации

1	Department of Chemical Enzymology, Faculty of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gori, Moscow 119899, Russian Federation
2	European Molecular Biology Laboratory (EMBL), c/o DESY, Notkestraβe 85, 22603 Hamburg, Germany
3	A.N. Bakh Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 117071, Russian Federation

Gln313 and His332 residues in the active centre of NAD+-dependent formate dehydrogenase (EC 1.2.1.2, FDH) from the bacterium Pseudomonas sp. 101 are conserved in all FDHs and are equivalent to the glutamate-histidine pair in active sites of d-specific 2-hydroxyacid dehydrogenases. Two mutants of formate dehydrogenase from Pseudomonas sp. 101, Gln313Glu and His332Phe, have been obtained and characterised. The Gln313Glu mutation shifts the pK of the group controlling formate binding from less than 5.5 in wild-type enzyme to 7.6 thus indicating that Gln313 is essential for the broad pH affinity profile towards substrate. His332Phe mutation leads to a complete loss of enzyme activity. The His332Phe mutant is still able to bind coenzyme but not substrate or analogues. The role of histidine in the active centre of FDH is discussed. The protonation state of His332 is not critical for catalysis but vital for substrate binding. A partial positive charge on the histidine imidazole, required for substrate binding, is provided via tight H-bond to the Gln313 carboxamide.

Tishkov V.I. , Matorin A.D. , Rojkova A.M. , Fedorchuk V.V. , Savitsky P.A. , Dementieva L.A. , Lamzin V.S. , Mezentzev A.V. , Popov V.O.
Site‐directed mutagenesis of the formate dehydrogenase active centre: role of the His332‐Gln313 pair in enzyme catalysis
FEBS Letters. 1996. V.390. N1. P.104-108. DOI: 10.1016/0014-5793(96)00641-2 WOS Scopus OpenAlex

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