Regioselectivity of Catechol O-Methyltransferase Confers Enhancement of Catalytic Activity.

Regioselectivity of Catechol O-Methyltransferase Confers Enhancement of Catalytic Activity.
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DOI:
10.1016/j.cplett.2011.03.048
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发表时间:
2011-04-20
影响因子:
2.8
通讯作者:
Dokholyan, Nikolay V.
Dokholyan, Nikolay V.
中科院分区:
化学4区
文献类型:
--
作者:
Tsao, Douglas;Liu, Shubin;Dokholyan, Nikolay V.

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邻苯二酚0-甲基转移酶(COMT)通过甲基化Meta位或帕拉羟基位置处的单个羟基来代谢邻苯二酚部分。在COMT活性中心附近的疏水氨基酸影响该反应的区域选择性。我们的序列分析突出了它们的重要性,表明这些残基在整个进化过程中高度保守。在气相中计算的反应势垒揭示了在Meta位甲基化期间较低的势垒,表明所观察到的COMT的间位区域选择性可以归因于底物本身,并且COMT已经进化出残基以增加催化速率的方式定向底物。
Catechol O-methyltransferase (COMT) metabolizes catechol moieties by methylating a single hydroxyl group at the meta- or para- hydroxyl position. Hydrophobic amino acids near the active site of COMT influence the regioselectivity of this reaction. Our sequence analysis highlights their importance by showing that these residues are highly conserved throughout evolution. Reaction barriers calculated in the gas phase reveal a lower barrier during methylation at the meta- position, suggesting that the observed meta-regioselectivity of COMT can be attributed to the substrate itself, and that COMT has evolved residues to orient the substrate in a manner that increases the rate of catalysis.
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