Short peptides derived from hGAPDH exhibit anti-cancer activity

Peptides have become an attractive drug discovery modality alongside small molecule compounds and high molecular weight biomolecules because they bind strongly to their target molecules. Previously, we found that secreted extracellular human GAPDH exhibits inhibitory activity against cancer cell growth. We sought to identify the minimal peptide sequence required for GAPDH activity in an effort to develop a small GAPDH-derived peptide with anti-cancer activity. Moreover, derivatives of the identified peptide, in which some amino acid residues were substituted with unnatural amino acids, were found to show stronger anti-cancer activity than non-substituted peptides.