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:
影响因子:
--
通讯作者:
Naismith JH
中科院分区:
文献类型:
--
作者:
Dong C;Flecks S;Unversucht S;Haupt C;van Pée KH;Naismith JH
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.
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