Tryptophan 7-halogenase (PrnA) structure suggests a mechanism for regioselective chlorination.

Tryptophan 7-halogenase (PrnA) structure suggests a mechanism for regioselective chlorination.
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色氨酸7-卤代酶(PRNA)结构提出了一种区域选择性氯化的机制。

DOI:
10.1126/science.1116510
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发表时间:
2005-09-30
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Naismith JH
Naismith JH
中科院分区:
其他
文献类型:
--
作者:
Dong C;Flecks S;Unversucht S;Haupt C;van Pée KH;Naismith JH

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氯化天然产物包括万古霉素和念珠藻素A。它们的生物合成涉及通过黄素依赖性卤化酶的区域选择性氯化。我们报告的色氨酸7-卤化酶(PrnA),区域选择性氯化色氨酸的结构表征。色氨酸和FAD被一个10 μ m长的隧道分开,并被不同的酶模块结合。FAD模块在卤化酶中是保守的,并且与黄素依赖性单加氧酶相关。基于生物化学研究,晶体结构和与单加氧酶的类比,我们预测FADH 2与O2反应生成过氧黄素,后者被Cl−分解。产生的HOCl被引导通过隧道,色氨酸,在那里它被激活,参与亲电芳香取代。
Chlorinated natural products include vancomycin and cryptophycin A. Their biosyntheses involves regioselective chlorination by flavin-dependent halogenases. We report the structural characterization of tryptophan 7-halogenase (PrnA), which regioselectively chlorinates tryptophan. Tryptophan and FAD are separated by a 10Å-long tunnel and bound by distinct enzyme modules. The FAD module is conserved in halogenases and is related to flavin-dependent monooxygenases. Based on biochemical studies, crystal structures and by analogy with monooxygenases, we predict FADH2 reacts with O2 making peroxy-flavin which is decomposed by Cl−. The resulting HOCl is guided through the tunnel, to tryptophan, where it is activated to participate in electrophilic aromatic substitution.
DOI: 10.1006/jmbi.1998.1802
发表时间: 1998-06-19
影响因子: 5.6
作者:
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