腺苷酸化
去肽
氨基酸
立体化学
生物化学
活动站点
肽
定点突变
突变
化学
DNA连接酶
酶
酶动力学
对接(动物)
同源建模
生物
生物合成
突变体
基因
护理部
医学
作者
Sylvester Hoffmann,Maik Damm,Lisa M. Roth,Roderich D. Süssmuth
标识
DOI:10.1002/cbic.202300233
摘要
Abstract The fungal cyclodepsipeptides (CDPs) enniatin, beauvericin, bassianolide, and PF1022 consist of alternating N ‐methylated l ‐amino and d ‐hydroxy acids. They are synthesized by non‐ribosomal peptide synthetases (NRPS). The amino acid and hydroxy acid substrates are activated by adenylation (A) domains. Although various A domains have been characterized thus giving insights into the mechanism of substrate conversion, little is known about the utilization of hydroxy acids in NRPSs. Therefore, we used homology modelling and molecular docking of the A 1 domain of enniatin synthetase (EnSyn) to gain insights into the mechanism of hydroxy acid activation. We introduced point mutations into the active site and used a photometric assay to study the substrate activation. The results suggest that the hydroxy acid is selected by interaction with backbone carbonyls rather than by a specific side chain. These insights enhance the understanding of non‐amino acid substrate activation and could contribute to the engineering of depsipeptide synthetases.
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