An iterative, bimodular nonribosomal peptide synthetase that converts anthranilate and tryptophan into tetracyclic asperlicins.

An iterative, bimodular nonribosomal peptide synthetase that converts anthranilate and tryptophan into tetracyclic asperlicins.
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DOI:
10.1016/j.chembiol.2013.04.019
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发表时间:
2013-07-25
影响因子:
--
通讯作者:
Walsh CT
Walsh CT
中科院分区:
生物1区
文献类型:
--
作者:
Gao X;Jiang W;Jiménez-Osés G;Choi MS;Houk KN;Tang Y;Walsh CT

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在酿酒酵母中异源表达的来自葱曲霉的双模276 kDa非核糖体肽合成酶AspA将色氨酸和两个芳香族β-氨基酸邻氨基苯甲酸酯(Ant)分子以10:1的比例转化为一对四环肽基生物碱曲霉素C和D。AspA的第一个模块反复激活和处理两个Ant分子,以在模块二上产生拴系的Ant-Ant-Trp-S-酶中间体。释放被假定涉及串联环化,其中第一步是线性三肽基-S-酶的大环化,通过末端缩合(CT)结构域产生区域异构四环曲霉素支架。11元大环中间体的transannular环化的计算分析表明,曲霉素C是动力学上有利的产品,由于高稳定性的构象类似于环化的过渡态,而曲霉素D是pharmacologically更稳定。
The bimodular 276 kDa nonribosomal peptide synthetase AspA from Aspergillus alliaceus, heterologously expressed in Saccharomyces cerevisiae, converts tryptophan and two molecules of the aromatic β-amino acid anthranilate (Ant) into a pair of tetracyclic peptidyl alkaloids asperlicin C and D in a ratio of 10:1. The first module of AspA activates and processes two molecules of Ant iteratively to generate a tethered Ant-Ant-Trp-S-enzyme intermediate on module two. Release is postulated to involve tandem cyclizations, in which the first step is the macrocyclization of the linear tripeptidyl-S-enzyme, by the terminal condensation (CT) domain to generate the regioisomeric tetracyclic asperlicin scaffolds. Computational analysis of the transannular cyclization of the 11-membered macrocyclic intermediate shows that asperlicin C is the kinetically favored product due to the high stability of a conformation resembling the transition state for cyclization, while asperlicin D is thermodynamically more stable.
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