PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12875848-3 2003 Comparison of these structures with that of the MgAMPPNP-NAG complex allows to delineate three successive steps during phosphoryl transfer: at the beginning, when the attacking and leaving O atoms and the P atom are imperfectly aligned and the distance between the attacking O atom and the P atom is 2.8A; midway, at the bipyramidal intermediate, with nearly perfect alignment and a distance of 2.3A; and, when the transfer is completed. Adenylyl Imidodiphosphate 48-56 N-acetyl-alpha-glucosaminidase Homo sapiens 57-60