Cyclic peptide or salt thereof, and uses thereof

Abstract

An object of the present invention is to provide a cyclic peptide or a salt thereof and a cyclic peptide complex or a salt thereof, which have excellent binding affinity to an FGFR protein and excellent stability, and to provide a culture medium composition, a material for purification, a material for labeling, a material for cell regulation, and a material for accumulation, which use the cyclic peptide or a salt thereof and the cyclic peptide complex or a salt thereof. A cyclic peptide or a salt thereof, the cyclic peptide being a peptide having an amino acid sequence represented by X1-Xn-X2-X3-X4, in which the cyclic peptide contains a cyclized portion that is cyclized via covalent bonding, and the cyclized portion includes a structure represented by Formula (2), X1 represents an alanine residue, a proline residue, a leucine residue, an isoleucine residue, a valine residue, a phenylalanine residue, a tyrosine residue, a tryptophan residue, an asparagine residue, a serine residue, an arginine residue, a histidine residue, or a methionine residue, Xn represents a peptide residue containing any 1 to 7 amino acid residues, X2 represents an alanine residue, a glycine residue, a leucine residue, an isoleucine residue, or a valine residue, X3 represents any amino acid residue, and X4 represents an amino acid residue having an aromatic residue on a side chain, in Formula (2), Z1 and Z2 each independently represent a linking group, and m represents an integer of 1 to 10.

Dependencies are inferred from the claim text.