Correlation between non-cyclic and pseudocyclic electron transport in pea chloroplasts: dependent on the concentration of ferredoxin
Red'ko, T.P.; Shmeleva, V.L.; Ivanov, B.N.; Mukhin, E.N.
Biokhimiia 47(10): 1695-1699
1982
ISSN/ISBN: 0320-9725 PMID: 7171648 Document Number: 191119
The effects of ferredoxin concentrations on the correlation between pseudocyclic and non-cyclic electron transport in isolated pea chloroplasts with NADP+ as an electron acceptor was studied. The correlation of psuedocyclic and non-cyclic electron transport upon photoreduction of NADP+ in vitro can be regulated by ferredoxin concentration. At ferredoxin concentrations studied an addition of NADP+ to the system which makes possible electron transfer from ferredoxin to ferredoxin-NADP+-reductase increases the rate of overall electron transport across the chain. Unlike the pseudocyclic electron transport, photoreduction of NADP+ reaches its maximal saturation at relatively low (10-15 microM) concentrations of ferredoxin (Km = approximately 2-5 microM).