Towards efficient hydrogen production: the impact of antenna size and external factors on electron transport dynamics in Synechocystis PCC 6803.

Photosynthesis Research
Gábor BernátMatthias Rögner

Abstract

Three Synechocystis PCC 6803 strains with different levels of phycobilisome antenna-deficiency have been investigated for their impact on photosynthetic electron transport and response to environmental factors (i.e. light-quality, -quantity and composition of growth media). Oxygen yield and P(700) reduction kinetic measurements showed enhanced linear electron transport rates-especially under photoautotrophic conditions-with impaired antenna-size, starting from wild type (WT) (full antenna) over DeltaapcE- (phycobilisomes functionally dissociated) and Olive (lacking phycocyanin) up to the PAL mutant (lacking the whole phycobilisome). In contrast to mixotrophic conditions (up to 80% contribution), cyclic electron transport plays only a minor role (below 10%) under photoautotrophic conditions for all the strains, while linear electron transport increased up to 5.5-fold from WT to PAL mutant. The minor contribution of the cyclic electron transport was proportionally increased with the linear one in the DeltaapcE and Olive mutant, but was not altered in the PAL mutant, indicating that upregulation of the linear route does not have to be correlated with downregulation of the cyclic electron transport. Antenna-deficiency involves high...Continue Reading

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Citations

Oct 11, 2011·Photosynthesis Research·Francisco M Reyes-SosaFernando P Molina-Heredia
Jul 3, 2013·Journal of Photochemistry and Photobiology. B, Biology·Igor N StadnichukVladimir Z Paschenko
Aug 14, 2009·The Journal of Biological Chemistry·Yuichi TsunoyamaMatthias Rögner
Dec 2, 2010·Microbiology and Molecular Biology Reviews : MMBR·Hermann BotheWilliam E Newton
Sep 26, 2013·Biochemical Society Transactions·Matthias Rögner
Oct 26, 2016·Biochimica Et Biophysica Acta·Sebastian VeitSascha Rexroth
Nov 11, 2018·Biochimica Et Biophysica Acta. Bioenergetics·Dmitry V ZlenkoIgor N Stadnichuk

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