The invention provides a recombinant polypeptide X-Y for enhancing cell transduction efficiency of a target agent, wherein X is a cell penetrating peptide DPV3, and Y is an Hsp40-J domain. Also provided is a method for enhancing cell transduction efficiency of a target agent, comprising conjugating/attaching said target agent with a recombinant polypeptide X-Y, wherein X is a cell penetrating peptide DPV3, and Y is an Hsp40-J domain. Further provided is a pharmaceutical composition comprising a therapeutic agent, wherein said therapeutic agent is modified by conjugating/attaching with a recombinant polypeptide X-Y, wherein X is a cell penetrating peptide DPV3, and Y is an Hsp40-J domain.
