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Substrate range of acetohydroxy acid synthase I from Escherichia coli in the stereoselective synthesis of α‐hydroxy ketones
Author(s) -
Engel Stanislav,
Vyazmensky Maria,
Berkovich Dvora,
Barak Ze'ev,
Chipman David M.
Publication year - 2004
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.20275
Subject(s) - chemistry , steric effects , reactivity (psychology) , aldehyde , substrate (aquarium) , electrophile , benzaldehyde , lipophilicity , stereoselectivity , escherichia coli , acceptor , enzyme , combinatorial chemistry , stereochemistry , organic chemistry , catalysis , biochemistry , biology , medicine , ecology , physics , alternative medicine , pathology , gene , condensed matter physics
Acetohydroxy acid synthase I appears to be the most effective of the AHAS isozymes found in Escherichia coli in the chiral synthesis of phenylacetyl carbinol from pyruvate and benzaldehyde. We report here the exploration of a range of aldehydes as substrates for AHAS I and demonstrate that the enzyme can accept a wide variety of substituted benzaldehydes, as well as heterocyclic and heteroatomic aromatic aldehydes, to produce chiral carbinols. The active site of AHAS I does not appear to impose serious steric constraints on the acceptor substrate. The influence of electronic effects on the reaction has been probed using substituted benzaldehydes as substrates. The electrophilicity of the aldehyde acceptor substrates is most important to their reactivity, but the lipophilicity of substituents also affects their reactivity. AHAS I is an effective biosynthetic platform for production of a variety of α‐hydroxy ketones, compounds with considerable potential as pharmacological precursors. © 2004 Wiley Periodicals, Inc.