雙模塊非核糖體肽合成酶結構獲解析
作者:
小柯機器人發布時間:2019/11/8 12:50:16
加拿大麥吉爾大學Martin Schmeing及其團隊利用雙模塊非核糖體肽合成酶的結構揭示了其構象靈活性。2019年11月8日,《科學》發表了這一研究成果。
研究人員確定了非核糖體肽合成酶(NRPS)線性短桿菌肽合成酶的大型構建體的五個X射線晶體結構,包括以縮合反應和模塊間肽基底物傳遞形式組織的全核心雙模塊結構。該結構揭示了相鄰模塊相對位置的差異,而這些差異並非嚴格地與催化循環相關,並且與小角度X射線散射數據一致。同源物的結構和共變分析使研究人員能夠創建突變體,從而提高模塊交換雙模塊NRPS的多肽產量。
據介紹,NRPS是利用模塊合成邏輯合成天然產物治療劑的生物合成酶,其中每個模塊都會向新生肽中添加一個氨醯基底物。
附:英文原文
Title: Structures of a dimodular nonribosomal peptide synthetase reveal conformational flexibility
Author: Janice M. Reimer, Maximilian Eivaskhani, Ingrid Harb, Alba Guarné, Martin Weigt, T. Martin Schmeing
Issue&Volume: Volume 366 Issue 6466
Abstract: Nonribosomal peptide synthetases (NRPSs) are biosynthetic enzymes that synthesize natural product therapeutics using a modular synthetic logic, whereby each module adds one aminoacyl substrate to the nascent peptide. We have determined five x-ray crystal structures of large constructs of the NRPS linear gramicidin synthetase, including a structure of a full core dimodule in conformations organized for the condensation reaction and intermodular peptidyl substrate delivery. The structures reveal differences in the relative positions of adjacent modules, which are not strictly coupled to the catalytic cycle and are consistent with small-angle x-ray scattering data. The structures and covariation analysis of homologs allowed us to create mutants that improve the yield of a peptide from a module-swapped dimodular NRPS.
DOI: 10.1126/science.aaw4388
Source: https://science.sciencemag.org/content/366/6466/eaaw4388
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037