| Literature DB >> 18598058 |
Shonoi A Barnett1, Tina L Amyes, Bryant M Wood, John A Gerlt, John P Richard.
Abstract
Kinetic analysis of decarboxylation catalyzed by S154A, Q215A, and S154A/Q215A mutant yeast orotidine 5'-monophosphate decarboxylases with orotidine 5'-monophosphate (OMP) and with a truncated nucleoside substrate (EO) activated by phosphite dianion shows (1) the side chain of Ser-154 stabilizes the transition state through interactions with the pyrimidine rings of OMP or EO, (2) the side chain of Gln-215 interacts with the phosphodianion group of OMP or with phosphite dianion, and (3) the interloop hydrogen bond between the side chains of Ser-154 and Gln-215 orients the amide side chain of Gln-215 to interact with the phosphodianion group of OMP or with phosphite dianion.Entities:
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Year: 2008 PMID: 18598058 PMCID: PMC2652672 DOI: 10.1021/bi800939k
Source DB: PubMed Journal: Biochemistry ISSN: 0006-2960 Impact factor: 3.162