PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15106882-8 2004 We suggest that a phosphate (or other activator) bound near the active site participates in AK catalysis by forming a transient pentavalent intermediate with a nonbridging oxygen of the beta-phosphate in ATP. beta-phosphate 186-200 adenosine kinase Homo sapiens 92-94