☆ 4.5 Article

Oxygen evolution in the thylakold-lacking cyanobacterium Glowbacter iolaceus PCC 7421

BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS (2008)

Journal

BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS

Volume 1777, Issue 4, Pages 369-378

Publisher

ELSEVIER SCIENCE BV

DOI: 10.1016/j.bbabio.2008.01.009

Keywords

cyanobacteria; extrinsic protein; oxygen evolution; photosystem II; delayed luminescence; Gloeobacter violaceus PCC 7421

Categories

Biochemistry & Molecular Biology Biophysics

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Abstract

The oxygen-evolving reactions of the thylakoid-lacking cyanobacterium Gloeobacter violaceus PCC 7421 were compared with those of Synechoeystis sp. PCC 6803. Four aspects were considered: sequence conservation in three extrinsic proteins for oxygen evolution, steady-state oxygen-evolving activity, charge recombination reactions, i.e., thermoluminescence and oscillation patterns of delayed luminescence on a second time scale and delayed fluorescence on the nanosecond time scale at - 196 degrees C. Even though there were significant differences between the amino acid sequences of extrinsic proteins in G. violaceus and Synechocystis sp. PCC 6803, the oxygen-evolving activities were similar. The delayed luminescence oscillation patterns and glow curves of thermoluminescence were essentially identical between the two species, and the nanosecond delayed fluorescence spectral profiles and lifetimes were also very similar. These results indicate clearly that even though the oxygen-evolving reactions are carried out in the periplasm by components with altered amino acid sequences, the essential reaction processes for water oxidation are highly conserved. In contrast, we observed significant changes on the reduction side of photosystem II. Based on these data, we discuss the oxygen-evolving activity of G. violaceus. (C) 2008 Elsevier B.V. All rights reserved.

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