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Sulphydryl groups in photosynthetic energy conservation. IV. Inhibition of the ATPase of chloroplast coupling factor 1 by sulphydryl reagents



Sulphydryl groups in photosynthetic energy conservation. IV. Inhibition of the ATPase of chloroplast coupling factor 1 by sulphydryl reagents



Biochimica et Biophysica Acta 459(1): 20-26



1. O-Iodosobenzoate and 2,2'-dithio bis-(5-nitropyridine) inhibited by about fifty per cent the ATPase activity of heat-activated chloroplast coupling factor 1 only when present during the heating but were without effect when added before or after the activation. Reversion of this inhibition was only obtained by a second heat treatment with 10 mM dithioerythritol. 2. The inhibition of the Ca2+-ATPase of coupling factor 1 by o-iodosobenzoate or 2,2'-dithio bis-(5-nitropyridine) was not additive with similar inhibitions obtained with the alkylating reagents iodoacetamide and N-ethylmaleimide. 3. The heat-activated ATPase of o-iodosobenzoate-treated coupling factor 1 had a higher Km for ATP, without modification of V. The modified enzyme was desensitized against the allosteric inhibitor ADP.

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Accession: 017209124

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PMID: 137745

DOI: 10.1016/0005-2728(77)90004-4


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