From consensus sequence peptide to high affinity ligand, a "library scan" strategy.
A wide variety of proteins have been shown to recognize and bind to specific amino acid sequences on other proteins. These sequences can be readily identified using combinatorial peptide libraries. However, peptides containing these preferred sequences ("consensus sequence peptides") typically display only modest affinities for the consensus sequence-binding site on the intact protein. In this report, we describe a parallel synthesis strategy that transforms consensus sequence peptides into high affinity ligands. The work described herein has focused on the Lck SH2 domain, which binds the consensus peptide acetyl-Tyr(P)-Glu-Glu-Ile-amide with a K(D) of 1.3 micrometer. We employed a strategy that creates a series of spatially focused libraries that challenge specific subsites on the target protein with a diverse array of functionality. The final lead compound identified in this study displayed a 3300-fold higher affinity for the Lck SH2 domain than the starting consensus sequence peptide.
Department of Biochemistry, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461-1602, USA.
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Lee
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Lawrence
D000595:Amino Acid Sequence; D016384:Consensus Sequence; D008024:Ligands; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck) / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D010455:Peptides / Q000737:chemistry* / Q000378:metabolism
D008024:Ligands; D010455:Peptides; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck)