The Glycine N-Methyltransferase Case Study: Another Challenge for QM-Cluster Models?
The Glycine N-Methyltransferase Case Study: Another Challenge for QM-Cluster Models?
复制标题
甘氨酸 N-甲基转移酶案例研究:QM 簇模型的另一个挑战?
DOI:
10.1021/acs.jpcb.3c04138
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
DeYonker,NathanJ
中科院分区:
文献类型:
--
作者:
Cheng,Qianyi;DeYonker,NathanJ
The methyl transfer reaction between SAM and glycine catalyzed by glycineN-methyltransferase (GNMT) was examined using QM-cluster models generated by Residue Interaction Network ResidUe Selector (RINRUS).RINRUSis a Python-based tool that can build QM-cluster models with rules-based processing of the active site residue interaction network. This way of enzyme model-building allows quantitative analysis of residue and fragment contributions to kinetic and thermodynamic properties of the enzyme. Many residue fragments are important for the GNMT catalytic reaction, such as Gly137, Asn138, and Arg175, which interact with the glycine substrate, and Trp30, Asp85, and Tyr242, which interact with the SAM cofactor. Our study shows that active site fragments that interact with the glycine substrate and the SAM cofactor must both be included in the QM-cluster models. Even though the proposed mechanism is a simple one-step reaction, GNMT may be a rather challenging case study for QM-cluster models because convergence in energetics requires models with >350 atoms. “Maximal” QM-cluster models built with either qualitative contact count ranking or quantitative interaction energies from functional group symmetry adapted perturbation theory provide acceptable results. Hence, important residue fragments that contribute to the energetics of the methyl-transfer reaction in GNMT are correctly identified in the RIN. Observations from this work suggest new directions to better establish an effective approach for constructing atomic-level enzyme models.
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影响因子:
5.6
作者:
Rutherford, K.;Le Trong, I.;Person, Vu. W.
通讯作者:
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影响因子:
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作者:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2019
期刊:
影响因子:
--
作者:
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通讯作者:
竹内孝江
影响因子:
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作者:
DeYonker, Nathan J.;Webster, Charles Edwin
通讯作者:
Webster, Charles Edwin