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. 1981 Oct;68(4):941–943. doi: 10.1104/pp.68.4.941

Effects of Hydroxamic Acids Isolated from Gramineae on Adenosine 5′-triphosphate Synthesis in Chloroplasts 1

Carlos B Queirolo 1,2, Carlos S Andreo 1,2, Rubén H Vallejos 1,2, Hermann M Niemeyer 1,2, Luis J Corcuera 1,2
PMCID: PMC426017  PMID: 16662030

Abstract

Two hydroxamic acids isolated from maize extracts, 2,4-dihydroxy-7-methoxy-1,4-(2H)-benzoxazin-3(4H)-one (DIMBOA) and the 2-O-β-d-glucopyranoside of DIMBOA, inhibit photophosphorylation by spinach 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 millimolar, 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. On the basis of these results, it is concluded that DIMBOA and its glucoside act as energy transfer inhibitors of photophosphorylation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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