US Patent 7291337 Peptide having an affinity for gp120

The peptide in this invention is a peptide having affinity to gp120 represented by Formula (1): H-A1-A2-A3-A4-A5-R(SEQ ID No. 1)(in the formula,H means hydrogen,A1 is aspartic acid, lysine, valine, glutamic acid, glycine, asparagine, or tyrosine residue,A2 is valine, aspartic acid, tryptophan, lysine, phenylalanine, isoleucine,leucine, or tyrosine residue,A3 is lysine, valine, aspartic acid, arginine, alanine, or tryptophan residue,A4 is alanine, tryptophan, or glycine residue,A5 is glycine, alanine, valine, leucine, isoleucine, serine, threonine, methionine, asparagine, glutamine, histidine, lysine, arginine, phenylalanine, tryptophan, proline, or tyrosine residue,R is OH derived from carboxyl group or NH2 derived from acid amide group).