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J. Biol. Chem., Vol. 259, Issue 13, 8048-8051, Jul, 1984

Evidence for the existence of a thylakoid intrinsic protein that binds ferredoxin-NADP+ oxidoreductase

RH Vallejos, E Ceccarelli and R Chan

The ferredoxin-NADP+ oxidoreductase of spinach chloroplasts was purified from a Triton X-100 thylakoid extract closely associated with an intrinsic polypeptide of 17.5 kDa. The 17.5-kDa polypeptide- reductase complex differs from soluble ferredoxin-NADP+ reductase in (a) its elution profile in an Affi-Gel blue column; (b) its behavior in isoelectric focusing electrophoresis; and (c) giving different immunoelectrophoretic arcs. The diaphorase activity of the purified complex showed the same pH profile of thylakoid-bound reductase. The curve changed to a form similar to that of soluble reductase after dissociation of the complex. Dissociation allowed separation of the components and was reversible. It is suggested that the 17.5-kDa intrinsic polypeptide is the reductase-binding protein and that it may play an important role in the physiological regulation of the reductase and of photosynthetic electron transport.
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