PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8634298-8 1996 We show that phenylarsenoxides potently inhibit E2-230K, apparently by binding to vicinal Cys residues of the enzyme: bound aminophenylarsenoxide partially protects the enzyme against inactivation by N-ethylmalemide (NEM), and prior enzyme inactivation with NEM blocks enzyme binding to immobilized phenylarsenoxide. Cysteine 90-93 ubiquitin conjugating enzyme E2 O Homo sapiens 48-55