Abstract: The present invention provides a highly efficient method of polymerizing a protein and a composition of polymerizing a protein. For example, the present invention provides a method comprising contacting a tyrosinase derived from nameko mushroom (Pholiota microspora) with a protein to be polymerized. The present invention also provides a composition for polymerizing a protein, comprising a tyrosinase derived from nameko mushroom (Pholiota microspora). In the present invention, glutamyltransferase can be optionally used. In addition, the protein to be polymerized includes, but not limited to, fish meat protein, egg white protein, a soybean protein, collagen, casein and gelatin.