Eur J Biochem. 1978 Nov 2;91(1):193-9.

DNA-dependent RNA polymerase from Halobacterium halobium.

Abstract

DNA-dependent RNA polymerase core enzyme was isolated from Halobacterium halobium. The purification is based on the finding that the enzyme is stable in 40% (v/v) glycerol, in the presence of 0.05 M MgCl2 and involves adsorption of contaminants to DEAE-cellulose, precipitation of the complex of polymerase with DNA by streptomycin sulfate, chromatography over Biogel and affinity chromatography over heparin-Sepharose or heparin-cellulose. The enzyme consists of four or five different subunits. The composition formula was estimated as (150000) (86000)2 (72000)2 (49000)3 or 2; there may be one or two different 49000-Mr subunits. RNA synthesis requires a template. Denatured DNA is more efficient than native DNA. The transcription of native DNA is specifically stimulated by the addition of a possibly sigma-like factor eluted from DEAE-cellulose. The fidelity of transcription is indicated by the absolute requirement for UTP besides ATP with poly[d(A-T)] as the template.

PMID:: 720336; [PubMed - indexed for MEDLINE]

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