A mutational analysis of active site residues in trans-3-chloroacrylic acid dehalogenase.

Abstract:

:trans-3-Chloroacrylic acid dehalogenase (CaaD) catalyzes the hydrolytic dehalogenation of trans-3-haloacrylates to yield malonate semialdehyde by a mechanism utilizing βPro-1, αArg-8, αArg-11, and αGlu-52. These residues are implicated in a promiscuous hydratase activity where 2-oxo-3-pentynoate is processed to acetopyruvate. The roles of three nearby residues (βAsn-39, αPhe-39, and αPhe-50) are unexplored. Mutants were constructed at these positions (βN39A, αF39A, αF39T, αF50A and αF50Y) and kinetic parameters determined along with those of the αR8K and αR11K mutants. Analysis indicates that αArg-8, αArg-11, and βAsn-39 are critical for dehalogenase activity whereas αArg-11 and αPhe-50 are critical for hydratase activity. Docking studies suggest structural bases for these observations.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Poelarends GJ,Serrano H,Huddleston JP,Johnson WH Jr,Whitman CP

doi

10.1016/j.febslet.2013.07.006

subject

Has Abstract

pub_date

2013-09-02 00:00:00

pages

2842-50

issue

17

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(13)00519-X

journal_volume

587

pub_type

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