Methods for generating and screening libraries of genetically encoded cyclic peptides in drug discovery

药物发现 英特因 肽库 噬菌体展示 计算生物学 小分子 环肽 生物 组合化学 生物信息学 化学 生物化学 肽序列 基因 RNA剪接 核糖核酸
作者
Catrin Sohrabi,Andrew Foster,Ali Tavassoli
出处
期刊:Nature Reviews Chemistry [Springer Nature]
卷期号:4 (2): 90-101 被引量:142
标识
DOI:10.1038/s41570-019-0159-2
摘要

Drug discovery has traditionally focused on using libraries of small molecules to identify therapeutic drugs, but new modalities, especially libraries of genetically encoded cyclic peptides, are increasingly used for this purpose. Several technologies now exist for the production of libraries of cyclic peptides, including phage display, mRNA display and split-intein circular ligation of peptides and proteins. These different approaches are each compatible with particular methods of screening libraries, such as functional or affinity-based screening, and screening in vitro or in cells. These techniques allow the rapid preparation of libraries of hundreds of millions of molecules without the need for chemical synthesis, and have therefore lowered the entry barrier to generating and screening for inhibitors of a given target. This ease of use combined with the inherent advantages of the cyclic-peptide scaffold has yielded inhibitors of targets that have proved difficult to drug with small molecules. Multiple reports demonstrate that cyclic peptides act as privileged scaffolds in drug discovery, particularly against ‘undruggable’ targets such as protein–protein interactions. Although substantial challenges remain in the clinical translation of hits from screens of cyclic-peptide libraries, progress continues to be made in this area, with an increasing number of cyclic peptides entering clinical trials. Here, we detail the various platforms for producing and screening libraries of genetically encoded cyclic peptides and discuss and evaluate the advantages and disadvantages of each approach when deployed for drug discovery. Macrocyclic peptides have great potential in drug discovery because they occupy unique chemical space between small molecules and biologics and could, thus, be useful against previously undruggable targets. This Review describes the methods for generating libraries of genetically encoded cyclic peptides and highlights how each is suited to different screening approaches.
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