VIRAL PROTEIN, HEAD-BINDING DOMAIN, PHAGE P22 TAILSPIKE, CHIMERA, HYDROLASE, LATE PROTEIN, ISOLEUCINE ZIPPER PIIGCN4 2VKY HEADBINDING DOMAIN OF PHAGE P22 TAILSPIKE C-TERMINALLY FUSED TO ISOLEUCINE ZIPPER PIIGCN4 (CHIMERA I)