Light modulation of chloroplast membrane-bound ferredoxin-NADP+ oxidoreductase.
Light increases the affinity of chloroplast membrane-bound ferredoxin-NADP+ oxidoreductase for its physiological substrates in NADP+ photoreduction, that is, NADP+ and ferredoxin. Light may cause this effect through a conformational change of the enzyme related to the formation of a light-driven delta pH since the effect is prevented by uncouplers. Although the external pH does influence the extent of photoreduction of NADP+ in saturating light, it does not significantly influence the extent of the energy-driven change in affinity of the enzyme for its substrates.
D000643:Ammonium Chloride / Q000494:pharmacology; D002736:Chloroplasts / Q000201:enzymology*; D005287:Ferredoxin-NADP Reductase / Q000378:metabolism*; D007425:Intracellular Membranes / Q000201:enzymology; D007700:Kinetics; D008027:Light; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism*; D010944:Plants / Q000201:enzymology
D000643:Ammonium Chloride; D005287:Ferredoxin-NADP Reductase; D009247:NADH, NADPH Oxidoreductases