Regulation of hydrogen photoproduction in Rhodobacter sphaeroides batch culture by external oxidizers and reducers
Photo-fermentative production of hydrogen (H2) by purple bacterium Rhodobacter sphaeroides MDC6521 from Armenian mineral springs and its regulation by external reducers and oxidizers have been investigated. Reducers such as dl-dithiothreitol (DTT) and dithionite suppress bacterial growth but enhance H2 yield of R. sphaeroides, whereas oxidizer ferricyanide inhibits both processes. The effect of DTT on DCCD-inhibited FoF1-ATPase activity of R. sphaeroides membrane vesicles has been analyzed too. DTT increases the DCCD-inhibited ATPase activity. Thus, more negative values of Eh by addition of DTT might regulate FoF1-ATPase activity. The participation of the ATPase in redox sensing under photo-fermentative H2 production is suggested. This enzyme might be a target, having a significant role in these processes of purple bacteria.
Year of publication: |
2014
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Authors: | Gabrielyan, Lilit ; Sargsyan, Harutyun ; Hakobyan, Lilit ; Trchounian, Armen |
Published in: |
Applied Energy. - Elsevier, ISSN 0306-2619. - Vol. 131.2014, C, p. 20-25
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Publisher: |
Elsevier |
Subject: | Hydrogen photoproduction | Redox potential | Redox reagents | FoF1-ATPase activity | Rhodobacter sphaeroides |
Saved in:
Online Resource