皮奥切林生物合成的填充性表皮酶域是已不存在的甲基转移酶
Trey A Ronnebaum1, Kathleen M Meneely2, Geoff P Horsman3
1Department of Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States.
Biochemistry
|August 26, 2025
概括
非核糖体合成酶 (NRPS) 通常使用表皮酶域进行D-氨基酸结合. 然而,2-基亚天然产品中的"填充"表皮酶域似乎具有催化不活性,这表明它们是非功能性甲基转移酶.
科学领域:
- 生物化学
- 分子生物学
- 自然产品化学
背景情况:
- 细菌和真菌通过非核糖体合成酶 (NRPS) 合成非核糖体 (NRPs).
- 这些NRP通常含有D-氨基酸,使其具有独特的化学特性和稳定性.
- 建议使用非正规的2-基亚类天然产品,
- 填充的
- 在NRPS腺化域内的表皮酶域用于立体化学反转.
研究的目的:
- 为了研究拟议的催化作用
- 填充的
- 在2-基亚素天然产品生物合成中的表皮酶域.
- 确定D-氨基酸在这些特定NRP中的结合机制.
主要方法:
- 合成的基质和产品类型的2-基亚.
- 从*Pseudomonas aeruginosa* (皮奥基林) 和*Streptomyces venezuelae* (瓦塔塞米辛) 检查的腺化-表皮酶二域.
- 对同类酶的酶活性进行比较
- 填充的
- 皮默酶域,例如来自* 伪蛋白* (enantiopyochelin).
主要成果:
- 酶表现出腺化活性,但没有检测到酶表酶活性.
- 对于2- 基醇乙烯类似物和分离的中间体,发生了自发的种族化.
- 存在或不存在的
- 填充的
- 与最终产品的立体化学反应没有相关性.
结论:
- 不属于正典的
- 填充的
- 在2-基亚天然产品中的表皮酶域具有催化功能.
- 这些域可能作为甲基转移酶或代表进化残留物.
- 这些途径的立体化学逆转通过非酶的机制发生.
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