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. 1994 Dec;106(4):1435–1442. doi: 10.1104/pp.106.4.1435

Deletion of the structural gene for the NADH-dehydrogenase subunit 4 of Synechocystis 6803 alters respiratory properties.

V A Dzelzkalns 1, C Obinger 1, G Regelsberger 1, H Niederhauser 1, M Kamensek 1, G A Peschek 1, L Bogorad 1
PMCID: PMC159683  PMID: 7846157

Abstract

Chloroplasts and cyanobacteria contain genes encoding polypeptides homologous to some subunits of the mitochondrial respiratory NADH-ubiquinol oxidoreductase complex (NADH dehydrogenase). Nothing is known of the role of the NADH dehydrogenase complex in photosynthesis, respiration, or other functions in chloroplasts, and little is known about the specific roles of the perhaps 42 subunits of this complex in the mitochondrion. Inactivation of a gene for subunit 4 (ndhD-2, ndh4) of this complex in the cyanobacterium Synechocystis 6803 has no effect on photosynthesis, judging from the rate of photoautotrophic growth of mutant cells, but the mutant's respiratory rate is about 6 times greater than that of wild-type cells. Respiratory electron transport activity in cyanobacteria is associated both with photosynthetic thylakoid membranes and with the outer cytoplasmic membrane of the cell. Cytoplasmic membranes of mutant cells have much greater NADH-dependent cytochrome reductase activity than preparations from wild-type cells; this activity remains at wild-type levels in isolated thylakoid membranes. It is suggested that the 56.6-kD product of ndhD-2 is not essential for the activity of a cytoplasmic membrane-bound NADH dehydrogenase but that it regulates the rate of electron flow through the complex, establishing a link between this ndh gene and respiration. The activity of the molecularly distinct thylakoid-bound NADH dehydrogenase is apparently unaffected by the loss of ndhD-2.

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Selected References

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