Crystal structure of the condensation domain from lovastatin polyketide synthase

Crystal structure of the condensation domain from lovastatin polyketide synthase
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洛伐他汀聚酮合酶缩合结构域的晶体结构

DOI:
10.1016/j.synbio.2018.11.003
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发表时间:
2018-11
影响因子:
4.8
通讯作者:
Jianting Zheng
Jianting Zheng
中科院分区:
生物学2区
文献类型:
--
作者:
Lei Wang;Meijuan Yuan;Jianting Zheng

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负责洛伐他汀生物合成的高度还原迭代聚酮酶含有与在非核糖体肽合成酶(NRPS)中观察到的缩合(CON)结构域同源的部分。在本研究中,我们表达了分离的洛伐他汀CON结构域,并解决了1.79纳米分辨率的晶体结构。整体结构显示与NRPS的典型缩合结构域相似,包含类似于氯霉素乙酰转移酶家族的酶的N-末端和C-末端亚结构域,而在活性位点处观察到不同的结构特征。底物通道的受体入口被柔性环阻断,从而防止装载底物进行新一轮的链伸长。位于底物通道中点的保守催化基序的突变与CON不能催化酰胺键的形成相一致。该结构有助于理解CON在洛伐他汀生物合成中的功能。
The highly reducing iterative polyketide synthases responsible for lovastatin biosynthesis contains a section homologous to condensation (CON) domain observed in nonribosomal peptide synthetases (NRPSs). In the present study, we expressed the isolated lovastatin CON domain and solved the crystal structure to 1.79 Å resolution. The overall structure shows similarity to canonical condensation domains of NRPSs, containing the N-terminal and C-terminal subdomains that resemble enzymes of chloramphenicol acetyltransferase family, whereas distinct structural features are observed at the active site. The acceptor entry of the substrate channel is blocked by a flexible loop, thereby preventing the loading of substrate for a new round of chain elongation. The mutation of conserved catalytic motif located at the midpoint of substrate channel agrees with the incapability of CON to catalyzed amide-bond formation. The structure helps to understand the function of CON in lovastatin biosynthesis.
酶依赖性 [4 2] 环加成取决于 PyrI4 中 N 末端序列与催化核心的类似盖子的相互作用
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