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PMID:7592491

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Citation

Buggy, J and Bauer, CE (1995) Cloning and characterization of senC, a gene involved in both aerobic respiration and photosynthesis gene expression in Rhodobacter capsulatus. J. Bacteriol. 177:6958-65

Abstract

The purple nonsulfur photosynthetic eubacterium Rhodobacter capsulatus is a versatile organism that can obtain cellular energy by several means, including the capture of light energy for photosynthesis as well as the use of light-independent respiration, in which molecular oxygen serves as a terminal electron acceptor. In this study, we have identified and characterized a novel gene, senC, mutations in which affect respiration as well as the induction of photosynthesis gene expression. The protein coded by senC exhibits 33% sequence identity to the yeast nucleus-encoded protein SCO1, which is thought to be a mitochondrion-associated cytochrome c oxidase assembly factor. Like yeast SCO1, SenC is required for optimal cytochrome c oxidase activity in aerobically grown R. capsulatus cells. We further show that senC is required for maximal induction from the puf and puh operons, which encode the structural polypeptides of the light-harvesting and reaction center complexes.

Links

PubMed PMC177566

Keywords

Amino Acid Sequence; Bacterial Proteins/chemistry; Bacterial Proteins/genetics; Base Sequence; Conserved Sequence; Electron Transport Complex IV/metabolism; Fungal Proteins/genetics; Gene Expression Regulation, Bacterial; Genes, Bacterial; Genes, Regulator; Membrane Proteins; Molecular Sequence Data; Multigene Family; Oxygen Consumption/genetics; Photosynthesis/genetics; Photosynthetic Reaction Center Complex Proteins; Rhodobacter capsulatus/genetics; Rhodobacter capsulatus/metabolism; Sequence Homology, Amino Acid

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

RHOCB:SENC

GO:1904960: positive regulation of cytochrome-c oxidase activity

ECO:0000315:

P

Figure 4 shows a qualitative analysis of the effect of SenC mutation on cytochrome-c oxidase activity. Based on the figure, It was concluded that senC mutations exhibit greatly reduced, but not entirely absent, Cox activity.

complete
CACAO 11717

RHOCB:SENC

GO:0009765: photosynthesis, light harvesting

ECO:0000315:

P

Figures 5 and 6 show that mutation in senC results in reduced levels of light-harvesting bacteriochlorophyll complexes.

complete
CACAO 11718

Notes

See also

References

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