PMID:3023293

Citation	Donohue, TJ, McEwan, AG and Kaplan, S (1986) Cloning, DNA sequence, and expression of the Rhodobacter sphaeroides cytochrome c2 gene. J. Bacteriol. 168:962-72
Abstract	The Rhodobacter sphaeroides cytochrome c2 functions as a mobile electron carrier in both aerobic and photosynthetic electron transport chains. Synthetic deoxyoligonucleotide probes, based on the known amino acid sequence of this protein (Mr 14,000), were used to identify and clone the cytochrome c2 structural gene (cycA). DNA sequence analysis of the cycA gene indicated the presence of a typical procaryotic 21-residue signal sequence, suggesting that this periplasmic protein is synthesized in vivo as a precursor. Synthesis of an immunoreactive cytochrome c2 precursor protein (Mr 15,500) was observed in vitro when plasmids containing the cycA gene were used as templates in an R. sphaeroides coupled transcription-translation system. Approximately 500 base pairs of DNA upstream of the cycA gene was sufficient to allow expression of this gene product in vitro. Northern blot analysis with an internal cycA-specific probe identified at least two possibly monocistronic transcripts present in both different cellular levels and relative stoichiometries in steady-state cells grown under different physiological conditions. The ratio of the small (740-nucleotide) and large (920-nucleotide) cycA-specific mRNA species was dependent on cultural conditions but was not affected by light intensity under photosynthetic conditions. Our results suggest that the increase in the cellular level of the cytochrome c2 protein found in photosynthetic cells was due, in part, to increased transcription of the single-copy cyc operon.
Links	PubMed PMC213578
Keywords	Base Sequence; Cloning, Molecular; Cytochrome c Group/biosynthesis; Cytochrome c Group/genetics; Cytochromes c2; DNA, Bacterial/genetics; Genes; Genes, Bacterial; Operon; Plasmids; Protein Precursors/biosynthesis; Protein Precursors/genetics; Rhodobacter sphaeroides/genetics; Rhodobacter sphaeroides/metabolism; Rhodospirillaceae/genetics; Rhodospirillaceae/metabolism; Transcription, Genetic
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
RHORT:CYC2	enables	GO:0009055: electron transfer activity	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete
RHORT:CYC2		GO:0009055: electron carrier activity	ECO:0000314:		F		Table 1	complete CACAO 3472

References

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