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. 1989 Apr;171(4):1967–1973. doi: 10.1128/jb.171.4.1967-1973.1989

Cyanobacterial RNA polymerase genes rpoC1 and rpoC2 correspond to rpoC of Escherichia coli.

W Q Xie 1, K Jäger 1, M Potts 1
PMCID: PMC209846  PMID: 2495268

Abstract

The DNA-dependent RNA polymerase (ribonucleoside triphosphate:RNA nucleotidyltransferase, EC 2.7.7.6) of cyanobacteria contains a unique core component, gamma, which is absent from the RNA polymerases of other eubacteria (G. J. Schneider, N. E. Tumer, C. Richaud, G. Borbely, and R. Haselkorn, J. Biol. Chem. 262:14633-14639, 1987). We present the complete nucleotide sequence of rpoC1, the gene encoding the gamma subunit, from the heterocystous cyanobacterium Nostoc commune UTEX 584. The derived amino acid sequence of gamma (621 residues) corresponds with the amino-terminal portion of the beta' polypeptide of Escherichia coli RNA polymerase. A second gene in N. commune UTEX 584, rpoC2, encodes a protein which shows correspondence with the carboxy-terminal portion of the E. coli beta' subunit. The rpoBC1C2 genes of N. commune UTEX 584 are present in single copies and are arranged in the order rpoBC1C2, and the coding regions are separated by short AT-rich spacer regions which have the potential to form very stable secondary structures. Our data indicate the occurrence of divergent evolution of structure in the eubacterial DNA-dependent RNA polymerase.

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Selected References

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