4.7 Article

Cobalamin reduction by dithionite. Evidence for the formation of a six-coordinate cobalamin(II) complex

期刊

DALTON TRANSACTIONS
卷 40, 期 38, 页码 9831-9834

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10219b

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资金

  1. Council on grants of the President of the Russian Federation for state support of young Russian researchers [MK-2618.2010.3]
  2. Center for Science and Education at Ivanovo State University of Chemistry and Technology
  3. Romanian government [PCCE_140/2008]
  4. U.S. National Institutes of Health [NS058030]
  5. NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [U01NS058030] Funding Source: NIH RePORTER

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Evidence for the formation of a unique, six-coordinate cobalamin(II) complex with the anion-radical SO2- during the reduction of aquacobalamin(III) by sodium dithionite, was obtained from spectrophotometric and EPR measurements. The pK(a) value of the weakly coordinated dimethylbenzimidazole group was found to be 4.8 +/- 0.1 at 25 degrees C.

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