Studies on the mechanism of cobalamin binding to hog intrinsic factor

E. L. Lien, L. Ellenbogen, Ping-Yee Law, J. M. Wood

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Cobalamin binding to hog intrinsic factor has been studied by affinity chromatography, and the cobalt atom of the cobalamin tested was found to be no more than 5 Å from the surface of the protein. A comparative study of the binding of the c carboxylic acid derivative versus the c amide at C7 of the B pyrrole ring indicates that a change in charge at this position of the corrin ring has little effect on complex formation with intrinsic factor. Furthermore, the coordination sphere in the region of 5,6 dimethyl benzimidazole must be extremely hydrophobic because CN(theta) will not displace this base from the cobalt atom when cobalamin is bound to intrinsic factor.

Original languageEnglish (US)
Pages (from-to)890-894
Number of pages5
JournalJournal of Biological Chemistry
Volume249
Issue number3
StatePublished - Jan 1 1974

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