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Hydrogen production by using Rhodobacter capsulatus mutants with genetically modified electron transfer chains
Date
2006-09-01
Author
Ozturk, Yavuz
Yucel, Meral
Daldal, Fevzi
Mandaci, Sevnur
Gündüz, Ufuk
Turker, Lemi
Eroglu, Inci
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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In Rhodobacter capsulatus excess reducing equivalents generated by organic acid oxidation is consumed to reduce protons into hydrogen by the activity of nitrogenase. Nitrogenase serves as a redox-balancing tool and is activated by the RegB/RegA global regulatory system during photosynthetic growth. The terminal cytochrome cbb3 oxidase and the redox state of the cyclic photosynthetic electron transfer chain serve redox signaling to the RegB/RegA regulatory systems in Rhodobacter. In this study, hydrogen production of various R. capsulatus strains harboring the genetically modified electron carrier cytochromes or lacking the cyt cbb(3) oxidase or the quinol oxidase were compared with the wild type. The results indicated that hydrogen production of mutant strains with modified electron carrier cytochromes decreased 3- to 4-fold, but the rate of hydrogen production increased significantly in a cbb(3) mutant. Moreover, hydrogen production efficiency of various R. capsulatus strains further increased by inactivation of uptake hydrogenase genes. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Subject Keywords
Rhodobacter capsulatus
,
Electron transfer chain
,
Cytochromes c2/cy
,
Cytochromes cbb(3) oxidase
,
Cytochromes cbb(3) oxidase
,
Quinol oxidase
,
Hydrogen
,
RegB/RegA
URI
https://hdl.handle.net/11511/30104
Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
DOI
https://doi.org/10.1016/j.ijhydene.2006.06.042
Collections
Graduate School of Natural and Applied Sciences, Article