Journal Article

An Alternative Electron Transfer Pathway Mediated by Chloroplast Envelope

Yoshinori Murata and Masaaki Takahashi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 40, issue 10, pages 1007-1013
Published in print January 1999 | ISSN: 0032-0781
Published online January 1999 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029481
An Alternative Electron Transfer Pathway Mediated by Chloroplast Envelope

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Localization of redox active substance(s) in chloroplast envelopes was revealed by means of the oxidation of Cyt c by isolated outer and inner envelope preparations. Irradiated chloroplasts reduced extra-chloroplastic Cyt c probably by an envelope electron transfer chain. The rate was saturated at a level of about 10 μmol (mg Chl)−1 h−1 under weak light of 10μE m−2 s−1. Cyt c photoreduction was inhibited by DCMU but not by 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB) indicating that the plastoquinone site is the junction of photosynthetic electron transfer chain to envelope redox substance. Complete suppression of the non-cyclic photophosphorylation of thylakoids by the presence of envelope membranes indicates that there is an alternative electron transfer path-way in envelope membranes that bypasses over the ΔpH-forming plastoquinone shuttle in the photosynthetic electron transfer chain.

Keywords: Chloroplast envelope; Electron transfer; Photophosphorylation; Plastoquinone; Spinacia oleracea L

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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