Plant and Cell Physiology Supplement
Supplement to Plant and Cell Physiology Vol. 47
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The secondary electron acceptors of photosystem Ι in Acaryochloris marina and Gloeobacter violaceus PCC7471
*Shunsuke OhashiSadamasa Hosodasojiro FukuyoHidetoshi InoueTohru TsutiyaHideaki MiyashitaMamoru MimuroMasami Kobayashi
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Abstract
The secondary electron acceptor of photosystem(PS) Ι in a cyanobacterium Groeobacter violaceus PCC7421 was identified as menaquinone-4(MQ-4) by HPLC, absorption and mass analyses[1]. MQ-4 was the sole quinone detected in PSΙ complexes of G. violaceus. The MQ-4 content in the PSΙ complexes was estimated to be two on the basis of Chl a' / P700=1, indicating that MQ-4 functions as A1 in the PSΙ complexes of G. violaceus.
The secondary electron acceptor of photosystem(PS) Ι in Acaryochloris marina was identified as phylloquinone(PhQ) by HPLC and absorption analyses. Further studies are now under way.

[1] M. Mimuro et al., (2005) FEBS Letters, 579, 3493-3496.
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© 2006 by The Japanese Society of Plant Physiologists
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