Protagonist Therapeutics is a U.S.-incorporated biotechnology company pursuing the discovery and development of disulfide-rich peptides (DRPs) as well differentiated alternatives to biologics, and also as new chemical entities (NCEs) against those targets and life threatening diseases for which ideal small molecule and/or biologic options are unavailable. DRPs are a proven chemical class of drugs with numerous examples of orally stable and injectable NCEs on the market and in various stages of clinical development. The company has a validated technology platform well suited to explore the full potential of the DRP scaffold class. It comprises of a purposefully built computational design environment, directed evolution approaches to prepare millions of molecules via phage libraries, and classical small molecule medicinal chemistry-type analoging and SAR development. 

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