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FEBS Lett. 1991 Jul 29;286(1-2):129-32.

Cyanobacteria contain a mitochondrial complex I-homologous NADH-dehydrogenase.

Author information

1
Institut für Entwicklungs- und Molekularbiologie der Pflanzen, Heinrich-Heine-Universität Düsseldorf, Germany.

Abstract

Thylakoid and cytoplasmic membranes of the cyanobacterium Synechocystis sp. PCC 6803 were purified by sucrose gradient centrifugation. Both membranes oxidize NADH in a rotenone-sensitive reaction. Antibodies prepared against psbG/ndhK and ndhJ fusion proteins detect the corresponding polypeptides in both membrane preparations. This demonstrates that a NADH-dehydrogenase, homologous to the mitochondrial NADH-ubiquinone-oxidoreductase (complex I of the respiratory chain) is present in cyanobacteria. The NADH-dehydrogenase can be solubilized with the detergent beta-D-dodecylmaltoside. Sedimentation analysis of the solubilized enzyme on a sucrose gradient indicates that it is a multisubunit protein complex.

PMID:
1907569
DOI:
10.1016/0014-5793(91)80957-5
[Indexed for MEDLINE]
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