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. 1976 Jan 1;153(1):55–62. doi: 10.1042/bj1530055

Substrate-binding ability of Escherichia coli ribonucleic acid polymerase in relation to its protein composition.

A Rognes, K A Abraham
PMCID: PMC1172540  PMID: 769786

Abstract

Interaction between Escherichia coli RNA polymerase and its substrates, the nucleoside triphosphates, was studied by gel-filtration and dialysis-rate-measurement techniques. 2. The holoenzyme bound variable amounts of ATP and GTP. There was no correlation between substrate-binding ability and enzyme activity of different enzyme preparations. 3. The core enzyme bound a maximum of 0.1 mol of ATP/mol of enzyme. The dissociation constant of this interaction was of the order of 1 X 10(-5)M. The core enzyme did not bind GTP. 4. A protein of mol.wt. 60000, which was eluted in the first fraction during phosphocellulose column chromatography of the holoenzyme, bound appreciable amounts of ATP. The dissociation constant of this interaction was of the order of 3 X 10(-5)-5 X 10(-6)M. 5. Evidence presented shows that this protein, and not the sigma factor, is responsible for the observed variation in the ATP-binding ability of the holoenzyme.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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