PMID: 2495365Mar 5, 1989Paper

Sequence, organization, transcription and evolution of RNA polymerase subunit genes from the archaebacterial extreme halophiles Halobacterium halobium and Halococcus morrhuae

Journal of Molecular Biology
H LeffersR A Garrett

Abstract

The genes for the four largest subunits, A, B', B" and C, of the DNA-dependent RNA polymerase were cloned from the extreme halophile Halobacterium halobium and sequenced and their transcription was analyzed. The downstream half of this gene cluster from another extreme halophile Halococcus morrhuae was also cloned, sequenced and its transcription products characterized. The H. halobium genes were transcribed into a common transcript from an upstream promoter in the order B", B', A and C. They are flanked by, and co-transcribed with, two smaller genes coding for 75 and 139 amino acid residues, respectively. Immediately downstream from these genes were two open reading frames that are homologous to ribosomal proteins S12 and S7 from Escherichia coli. In both extreme halophiles these genes were transcribed from their own promoter, but in Hc. morrhuae there was also considerable read-through from the RNA polymerase genes. Sequence alignment studies showed that the combined B" + B' subunits are equivalent to the B subunits of the eukaryotic polymerases I and II and to the eubacterial beta subunit, while the combined A + C subunits correspond to the A subunits of eukaryotic RNA polymerases I, II and III and to the eubacterial beta' s...Continue Reading

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