Bachovchin, William W. and Moore, Kevin W. and Richards, John H. (1978) Mechanism of action of adenosylcobalamin: hydrogen transfer in the inactivation of diol dehydratase by glycerol. Biochemistry, 17 (11). pp. 2218-2224. ISSN 0006-2960. https://resolver.caltech.edu/CaltechAUTHORS:20150501-152518245
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Abstract
We have investigated the kinetic characteristics of the inactivation of the adenosylcobalamin-dependent enzyme propanediol dehydratase by glycerol, (RS)-1,1-dideuterioglycerol, (R)-1,1-dideuterioglycerol, and perdeuterioglycerol in the presence of 1,2-propanediol and 1,1-dideuterio- 1,2-propanediol. The results imply that hydrogen (or deuterium) attached to C-1 of 1,2-propanediol participates in the inactivation process and contributes to the expression of a kinetic isotope effect on the rate of inactivation. The mechanism for this inactivation must involve the cofactor as an intermediate hydrogen carrier, presumably in the form of 5’-deoxyadenosine. Moreover, a mechanism involving a rate-determining transfer of hydrogen from an intermediate containing three equivalent hydrogens quantitatively accounts for all of the results. When diol dehydratase holoenzyme is inactivated by [ 1^(-3)H glycerol, 5’-deoxyadenosine which is enriched in tritium by a factor of 2.1 over that in glycerol can be isolated from the reaction mixture.
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| Additional Information: | © 1978 American Chemical Society. Received September 13 1977. Contribution No. 5657 from the Church Laboratory of Chemical Biology, Division of Chemistry and Chemical Engineering, California Institute of Technology. Pasadena, California 91 125. Received September 13, 1977. This research was supported by National Institutes of Health Grant GM-10218. National Institutes of Health Trainee (GM 01262). | |||||||||
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| Issue or Number: | 11 | |||||||||
| Record Number: | CaltechAUTHORS:20150501-152518245 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150501-152518245 | |||||||||
| Official Citation: | Bachovchin, W. W., Moore, K. W., & Richards, J. H. (1978). Mechanism of action of adenosylcobalamin: hydrogen transfer in the inactivation of diol dehydratase by glycerol. Biochemistry, 17(11), 2218-2224. doi: 10.1021/bi00604a031 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 57168 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Joanne McCole | |||||||||
| Deposited On: | 01 May 2015 23:34 | |||||||||
| Last Modified: | 03 Oct 2019 08:21 |
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