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Alternative Photosystem I-driven Electron Transport Routes: Mechanisms and Functions

Overview
Journal Photosynth Res
Publisher Springer
Date 2005 Oct 18
PMID 16228610
Citations 49
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Abstract

In addition to the linear electron transport, several alternative Photosystem I-driven (PS I) electron pathways recycle the electrons to the intersystem electron carriers mediated by either ferredoxin:NADPH reductase, NAD(P)H dehydrogenase, or putative ferredoxin:plastoquinone reductase. The following functions have been proposed for these pathways: adjustment of ATP/NADPH ratio required for CO(2) fixation, generation of the proton gradient for the down-regulation of Photosystem II (PS II), and ATP supply the active transport of inorganic carbon in algal cells. Unlike ferredoxin-dependent cyclic electron transport, the pathways supported by NAD(P)H can function in the dark and are likely involved in chlororespiratory-dependent energization of the thylakoid membrane. This energization may support carotenoid biosynthesis and/or maintain thylakoid ATPase in active state. Active operation of ferredoxin-dependent cyclic electron transport requires moderate reduction of both the intersystem electron carriers and the acceptor side of PS I, whereas the rate of NAD(P)H-dependent pathways under light depends largely on NAD(P)H accumulation in the stroma. Environmental stresses such as photoinhibition, high temperatures, drought, or high salinity stimulated the activity of alternative PS I-driven electron transport pathways. Thus, the energetic and regulatory functions of PS I-driven pathways must be an integral part of photosynthetic organisms and provides additional flexibility to environmental stress.

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References
1.
Tagawa K, Tsujimoto H, Arnon D . Role of chloroplast ferredoxin in the energy conversion process of photosynthesis. Proc Natl Acad Sci U S A. 1963; 49:567-72. PMC: 299906. DOI: 10.1073/pnas.49.4.567. View

2.
Joliot P, Joliot A . Cyclic electron transfer in plant leaf. Proc Natl Acad Sci U S A. 2002; 99(15):10209-14. PMC: 126649. DOI: 10.1073/pnas.102306999. View

3.
Finazzi G, Furia A, Barbagallo R, Forti G . State transitions, cyclic and linear electron transport and photophosphorylation in Chlamydomonas reinhardtii. Biochim Biophys Acta. 1999; 1413(3):117-29. DOI: 10.1016/s0005-2728(99)00089-4. View

4.
Mi H, Deng Y, Tanaka Y, Hibino T, Takabe T . Photo-induction of an NADPH dehydrogenase which functions as a mediator of electron transport to the intersystem chain in the cyanobacterium Synechocystis PCC6803. Photosynth Res. 2005; 70(2):167-73. DOI: 10.1023/A:1017946524199. View

5.
Horvath E, Peter S, Joet T, Rumeau D, Cournac L, Horvath G . Targeted inactivation of the plastid ndhB gene in tobacco results in an enhanced sensitivity of photosynthesis to moderate stomatal closure. Plant Physiol. 2000; 123(4):1337-50. PMC: 59092. DOI: 10.1104/pp.123.4.1337. View