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Screening of a Phage Display Library of Exendin-4 Mutants with the Extracellular Domain of Rat GLP-1 Receptor

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A phage display library of exendin-4 mutants was screened with the extracellular domain of rat glucagon-like peptide 1 receptor as the target. A novel variant of exendin-4 with higher affinity for the receptor fraction than that of the wild type was identified. The increased affinity was attributed to the substitution of Glu16 by Val16. Although the substitution probably caused an increased entropic cost to the helix region, the linker around Val16 is more flexible resulting in the increase of affinity for the receptor.

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Keywords: Exendin-4; GLP-1 receptor; phage display library

Document Type: Research Article

Publication date: 2007-08-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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