Effect of Ferredoxin on the Diaphorase Activity of Cyanobacterial Ferredoxin-NADP Reductase

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1985 English Publisher:Oxford University Press (OUP)Journal:Plant Physiology, volume 77, pages 229-231 (issn: 0032-0889, eissn: 1532-2548,

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Authors: H, Melamed-Harel; E, Tel-Or; A S, Pietro;

doi: 10.1104/pp.77.1.229

pmid: 16664015

pmc: PMC1064488

Effect of Ferredoxin on the Diaphorase Activity of Cyanobacterial Ferredoxin-NADP Reductase

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Abstract

The interaction of ferredoxin-NADP reductase (FNR) and ferredoxin (Fd) results in an enhanced rate of reaction and a shift of the pH optimum for the FNR-mediated diaphorase reaction. Low concentrations of NaCl (<100 millimolar), favorable for formation of the FNR:Fd complex, further magnify the alteration of the diaphorase reaction; the activity is enhanced 3-fold and pH optimum is shifted from 9.5 to 7.8. The Fd-stimulated diaphorase activity of FNR may result either from a conformational change of the enzyme and/or from a transition from a two electron to a one electron reaction.

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Hebrew University of Jerusalem
Israel

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