학술논문
O2 reduction by photosystem I involves phylloquinone under steady-state illumination.
Document Type
Article
Author
Source
Subject
*OXYGEN reduction
*PHOTOSYSTEMS
*QUINONE
*DIMETHYLFORMAMIDE
*FERREDOXINS
*CHARGE exchange
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*
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Language
ISSN
0014-5793
Abstract
O 2 reduction was investigated in photosystem I (PS I) complexes isolated from cyanobacteria Synechocystis sp. PCC 6803 wild type (WT) and menB mutant strain, which is unable to synthesize phylloquinone and contains plastoquinone at the quinone-binding site A 1 . PS I complexes from WT and menB mutant exhibited different dependencies of O 2 reduction on light intensity, namely, the values of O 2 reduction rate in WT did not reach saturation at high intensities, in contrast to the values in menB mutant. The obtained results suggest the immediate phylloquinone involvement in the light-induced O 2 reduction by PS I. [ABSTRACT FROM AUTHOR]