Reaction mechanism of cis-3-chloroacrylic acid dehalogenase: a theoretical study.
Reaction mechanism of cis-3-chloroacrylic acid dehalogenase: a theoretical study.
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DOI:
10.1021/bi900879a
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发表时间:
2009-10-13
期刊:
影响因子:
2.9
通讯作者:
Himo, Fahmi
中科院分区:
文献类型:
--
作者:
Sevastik, Robin;Whitman, Christian P.;Himo, Fahmi
The reaction mechanism of cis-3-chloroacrylic acid dehalogenase (cis-CaaD) is studied using the density functional theory method B3LYP. This enzyme catalyzes the hydrolytic dehalogenation of cis-3-chloroacrylic acid to yield malonate semialdehyde and HCl. The uncatalyzed reaction is first considered and excellent agreement is found between the calculated barrier and the measured rate constant. The enzymatic reaction is then studied with an active site model consisting of 159 atoms. The results suggest an alternative mechanism for cis-CaaD catalysis and different roles for some active site residues in this mechanism.
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