Abstract
Physico-chemical properties of homogeneous preparations of soluble and membrane-bound hydrogenases from the purple sulfur bacterium Thiocapsa roseopersicina BBS and membrane-bound hydrogenase of Rhodopseudomonas capsulata, strain B10 have been studied. Compared to the enzymes from other sources, the hydrogenase of Thiocapsa roseopersicina is more stable to O2 and products of its reduction (O 2 - , H2O2), temperature and a number of other factors of the medium. A natural electron donor for T. roseopersicina hydrogenase is a low-potential cytochrome C′3, while the natural electron acceptors for hydrogenases of R. capsulata, T. roseopersicina, Ectothiorhodospira shaposhnikovii and Anabaena cylindrica are cytochromes of groups “c” and “b”.
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