Activation of the anaerobic ribonucleotide reductase from Escherichia coli by S-adenosylmethionine - PubMed (original) (raw)
. 1992 Dec 15;267(35):25548-52.
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- PMID: 1460050
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Activation of the anaerobic ribonucleotide reductase from Escherichia coli by S-adenosylmethionine
J Harder et al. J Biol Chem. 1992.
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Abstract
The anaerobic ribonucleoside triphosphate reductase from Escherichia coli reduces CTP to dCTP in the presence of a second protein, named dA1, and a Chelex-treated boiled extract of the bacteria, named RT. The reaction requires S-adenosylmethionine, NADPH, dithiothreitol, ATP, and Mg2+ and K+ ions. It occurs only under anaerobic conditions. We now show that the overall reaction occurs in two steps. The first is an activation of the reductase by dA1 and RT and requires S-adenosylmethionine, NADPH, dithiothreitol, and possibly K+ ions. In the second step, the activated reductase reduces CTP to dCTP with ATP acting as an allosteric effector. During activation, S-adenosylmethionine is cleaved reductively to methionine + 5'-deoxyadenosine. This step is inhibited strongly by S-adenosylhomocysteine and various chelators. The activation of the anaerobic reductase shows a considerable similarity to that of pyruvate formate-lyase (Knappe, J., Neugebauer, F. A., Blaschkowski, H. P., and Gänzler, M. (1984) Proc. Natl. Acad. Sci. U.S.A. 81, 1332-1335).
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