Fibronectin type III domain proteins with enhanced solubility

摘要

Provided herein are polypeptides comprising a modified fibronectin type III (Fn3) domain, wherein the amino acid corresponding to residue 58 of SEQ ID NO: 1 is mutated, and wherein the solubility is enhanced relative to the solubility of a Fn3 domain in which the amino acid corresponding to residue 58 of SEQ ID NO: 1 is not mutated. Also provided are libraries comprising a plurality of the polypeptides and a method for identifying a polypeptide that binds to a target.