Stabilization of the adenosyl radical in coenzyme B<inf>12</inf> - A theoretical study

Nicole Dölker, Feliu Maseras, Per E.M. Siegbahn

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38 Citations (Scopus)

Abstract

Density functional theory B3LYP calculations have been carried out on a large model for coenzyme B12. The dissociation curve for the homolytic cleavage of the Co-C bond has been studied for the free cofactor, in the gas phase and including the effect of a dielectric continuum with a dielectric constant of 4.00, as well as in the presence of some key residues present in methylmalonyl-CoA mutase, an enzyme that depends on coenzyme B 12. We describe a hitherto unknown effect of the cofactor which facilitates the homolysis reaction: electrostatic interactions stabilize the radicals formed in this step. H-bonding to protein residues leads to further stabilization. © 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)174-178
JournalChemical Physics Letters
Volume386
Issue number1-3
DOIs
Publication statusPublished - 1 Mar 2004

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