Structure-Function Analysis of the Extended Conformation of a Polyketide Synthase Module.

Structure-Function Analysis of the Extended Conformation of a Polyketide Synthase Module.
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聚酮化合物合酶模块扩展构象的结构 - 功能分析。

DOI:
10.1021/jacs.8b02100
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发表时间:
2018-05-30
影响因子:
15
通讯作者:
Khosla C
Khosla C
中科院分区:
化学1区
文献类型:
--
作者:
Li X;Sevillano N;La Greca F;Deis L;Liu YC;Deller MC;Mathews II;Matsui T;Cane DE;Craik CS;Khosla C

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此前已经观察到装配线聚酮合酶(PKS)的催化模块有两种截然不同的构象——“延伸”结构和“拱形”结构——尽管这两种结构的催化相关性都尚未直接确定。通过使用完全人源抗原结合片段 (Fab) 文库,鉴定出一种高亲和力抗体,该抗体与 PKS 模块的扩展构象结合,并通过 X 射线晶体学和串联尺寸排阻色谱 - 小角度 X 射线散射 (SEC-SAXS) 进行了验证。动力学分析证明,这种抗体稳定的模块构象完全能够催化模块间聚酮化合物链易位以及模块内聚酮化合物链延长和正在生长的聚酮化合物链的官能团修饰。因此,PKS 模块的扩展构象完全胜任其所有基本催化功能。
Catalytic modules of assembly-line polyketide synthases (PKSs) have previously been observed in two very different conformations—an “extended” architecture and an “arch-shaped” architecture—although the catalytic relevance of neither has been directly established. By the use of a fully human naïve antigen-binding fragmenẗ (Fab) library, a high-affinity antibody was identified that bound to the extended conformation of a PKS module, as verified by X-ray crystallography and tandem size-exclusion chromatography–small-angle X-ray scattering (SEC–SAXS). Kinetic analysis proved that this antibody-stabilized module conformation was fully competent for catalysis of intermodular polyketide chain translocation as well as intramodular polyketide chain elongation and functional group modification of a growing polyketide chain. Thus, the extended conformation of a PKS module is fully competent for all of its essential catalytic functions.
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