Optical study of cytochrome cM formation in Synechocystis.

Abstract:

:The expression of the cytM gene, which encodes cytochrome cM in Synechocystis sp. PCC 6803, is induced under stress conditions such as low temperature. Results of spectrophotometric studies revealed that cytochrome cM was oxidized by light absorbed by photosystem I in cells that had acclimatized to a low temperature. However, no similar light-induced oxidation of cytochrome cM was observed in delta cytM mutant cells. The kinetics of the oxidation and reduction of P700 before and after acclimation of Synechocystis cells to low temperature suggested that cytochrome cM might donate electrons to photooxidized P700. Our observations indicate that cytochrome cM is synthesized under low-temperature stress and that it might carry electrons directly to P700+ in photosystem I.

journal_name

IUBMB Life

journal_title

IUBMB life

authors

Shuvalov VA,Allakhverdiev SI,Sakamoto A,Malakhov M,Murata N

doi

10.1080/15216540118716

keywords:

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

93-7

issue

2

eissn

1521-6543

issn

1521-6551

journal_volume

51

pub_type

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