Photoheterotrophy in marine prokaryotes
Photoheterotrophy in marine prokaryotes
Despite considerable advances in the understanding of the various microbial photoheterotrophic mechanisms, the role of solar radiation in the metabolism of bacterioplankton in the ocean is difficult to assess. It is already apparent that rates of CO2 fixation by prokaryotic cells may be only a part of the picture. Photophosphorylation is difficult to differentiate from respiratory phosphorylation and other types of ATP synthesis. Solar energy could by-pass ATP synthesis, instead being used to generate a proton-motive force, which in turn could be directly used for cell motility or even for importing molecules into cells. In addition, photoheterotrophic prokaryotes could actively regulate intake and use of solar energy for different metabolic functions depending on the energetic demands of the cell. The factors listed above hence require consideration when solar energy input into metabolism of oceanic photoheterotrophic prokaryotes is experimentally quantified and numerically modelled.
933-938
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743
September 2009
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Zubkov, Mikhail V.
(2009)
Photoheterotrophy in marine prokaryotes.
Journal of Plankton Research, 31 (9), .
(doi:10.1093/plankt/fbp043).
Abstract
Despite considerable advances in the understanding of the various microbial photoheterotrophic mechanisms, the role of solar radiation in the metabolism of bacterioplankton in the ocean is difficult to assess. It is already apparent that rates of CO2 fixation by prokaryotic cells may be only a part of the picture. Photophosphorylation is difficult to differentiate from respiratory phosphorylation and other types of ATP synthesis. Solar energy could by-pass ATP synthesis, instead being used to generate a proton-motive force, which in turn could be directly used for cell motility or even for importing molecules into cells. In addition, photoheterotrophic prokaryotes could actively regulate intake and use of solar energy for different metabolic functions depending on the energetic demands of the cell. The factors listed above hence require consideration when solar energy input into metabolism of oceanic photoheterotrophic prokaryotes is experimentally quantified and numerically modelled.
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Published date: September 2009
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Local EPrints ID: 67547
URI: http://eprints.soton.ac.uk/id/eprint/67547
ISSN: 0142-7873
PURE UUID: 55d13b00-38d5-4dcb-9c4b-487da15da0c3
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Date deposited: 24 Aug 2009
Last modified: 13 Mar 2024 18:53
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Mikhail V. Zubkov
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