Ribosomal Synthesis of Macrocyclic Peptides <i>in Vitro</i> and <i>in Vivo</i> Mediated by Genetically Encoded Aminothiol Unnatural Amino Acids
作者:John R. Frost、Nicholas T. Jacob、Louis J. Papa、Andrew E. Owens、Rudi Fasan
DOI:10.1021/acschembio.5b00119
日期:2015.8.21
bacterial cells. This methodology furnishes a new platform for the creation and screening of genetically encoded libraries of conformationally constrained peptides. This strategy was applied to identify and isolate a low-micromolar streptavidin binder (KD = 1.1 μM) from a library of cyclic peptides produced in Escherichia coli, thereby illustrating its potential toward aiding the discovery of functional
报道了一种由核糖体衍生的多肽前体协调形成侧链至尾环肽的通用方法。核糖体掺入含内含肽的前体蛋白后,带有侧链1,3-或1,2-氨基硫醇官能团的设计者非天然氨基酸能够通过C端连接/环收缩机制促进下游靶标肽序列的环化。使用这种方法,可以通过pH触发的方式在体外生成大小和组成可变的肽大环或直接在活细菌细胞中。这种方法为构象受限肽的遗传编码文库的创建和筛选提供了一个新平台。该策略已应用于从大肠杆菌中生产的环状肽文库中鉴定和分离低微摩尔链霉亲和素结合剂(K D = 1.1μM),从而说明了其在协助发现功能性肽大环化合物方面的潜力。