Large-Scale Density Functional Theory Transition State Searching in Enzymes.

Large-Scale Density Functional Theory Transition State Searching in Enzymes.
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酶中的大规模密度泛函理论过渡态搜索。

DOI:
10.1021/jz5018703
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发表时间:
2014
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Lever G
Lever G
中科院分区:
--
文献类型:
--
作者:
Lever G

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Linear-scaling quantum mechanical density functional theory calculations have been applied to study the rearrangement of chorismate to prephenate in large-scale models of theBacillus subtilischorismate mutase enzyme. By treating up to 2000 atoms at a consistent quantum mechanical level of theory, we obtain an unbiased, almost parameter-free description of the transition state geometry and energetics. The activation energy barrier is calculated to be lowered by 10.5 kcal mol–1in the enzyme, compared with the equivalent reaction in water, which is in good agreement with experiment. Natural bond orbital analysis identifies a number of active site residues that are important for transition state stabilization in chorismate mutase. This benchmark study demonstrates that linear-scaling density functional theory techniques are capable of simulating entire enzymes at the ab initio quantum mechanical level of accuracy.
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