Effects of Hydroxamic Acids Isolated from Gramineae on Adenosine 5′-triphosphate Synthesis in Chloroplasts
- 1 October 1981
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 68 (4) , 941-943
- https://doi.org/10.1104/pp.68.4.941
Abstract
Two hydroxamic acids isolated from maize [Zea mays cv. LH Rinconada] extracts, 2,4-dihydroxy-7-methoxy-1,4-(2H)-benzoxazin-3(4H)-one (DIMBOA) and the 2-O-.beta.-D-glucopyranoside of DIMBOA, inhibit photophosphorylation by spinach [Spinacia oleracea] chloroplasts. Both cyclic and noncyclic photophosphorylations were inhibited to the same extent. The concentrations producing 50% inhibition for DIMBOA and its glucoside were about 1 and 4 mM, respectively. These compounds inhibit coupled electron transport but do not affect basal or uncoupled electron transport. Both acids inhibit the ATPase activities of membrane-bound coupling factor 1 (CF1) and of purified CF1. Apparently, DIMBOA and its glucoside act as energy transfer inhibitors of photophosphorylation.This publication has 18 references indexed in Scilit:
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