PTM - CPLM Gene Name UniProt ID Type Position Code USP21; USP23; PP1490 Q9UK80 Ubiquitination 289 K USP21; USP23; PP1490 Q9UK80 Ubiquitination 379 K USP21; USP23; PP1490 Q9UK80 Ubiquitination 475 K USP21; USP23; PP1490 Q9UK80 Ubiquitination 407 K USP21; USP23; PP1490 Q9UK80 Ubiquitination 413 K

PTM - dbPAF Gene Name UniProt ID Position Type Species USP21; USP23; PP1490 Q9UK80 106 T Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 111 S Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 113 S Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 115 S Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 116 S Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 132 T Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 140 S Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 290 Y Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 297 Y Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 362 Y Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 368 S Homo sapiens(Human) USP21; USP23; PP1490 Q9UK80 93 S Homo sapiens(Human)

PTM - PhosphositePlus UniProt ID MOD_RSD Type SITE_+/-7_AA Q9UK80 S93-p Phosphorylation HGVPLPGsPPPTVAL Q9UK80 T106-p Phosphorylation ALPLPSRtNLARsKs Q9UK80 S111-p Phosphorylation SRtNLARsKsVssGD Q9UK80 S113-p Phosphorylation tNLARsKsVssGDLR Q9UK80 S115-p Phosphorylation LARsKsVssGDLRPM Q9UK80 S116-p Phosphorylation ARsKsVssGDLRPMG Q9UK80 T132-p Phosphorylation ALGGHRGtGELGAAL Q9UK80 S140-p Phosphorylation GELGAALsRLALRPE Q9UK80 Y290-p Phosphorylation FRAVFQKyVPSFSGy Q9UK80 Y297-p Phosphorylation yVPSFSGySQQDAQE Q9UK80 S335-p Phosphorylation LANGPVPsPPRRGGA Q9UK80 S538-p Phosphorylation VYNDSRVsPVSENQV Q9UK80 K407-ub Ubiquitination LSLPIPKkGFAGGkV Q9UK80 K413-ub Ubiquitination KkGFAGGkVSLRDCF Q9UK80 K475-ub Ubiquitination ASRGSIKkSSVGVDF

PTM - dbPTM UniProt ID Position Code Type Resources References Q9UK80 407 K Ubiquitylation Phosphositeplus.1010730 21906983 Q9UK80 413 K Ubiquitylation Phosphositeplus.1010730 21906983 Q9UK80 113 S Acetylation HPRD 9.0 19413330 Q9UK80 116 S Phosphorylation HPRD 9.0 19413330 Q9UK80 140 S Phosphorylation HPRD 9.0 19413330 Q9UK80 132 T Phosphorylation HPRD 9.0 19413330 Q9UK80 75 G Proteolytic Cleavage HPRD 9.0 9353319

PTM - HPRD Symbol Position Code Type References USP21 113 S Acetylation 19413330 USP21 116 S Phosphorylation 19413330 USP21 132 T Phosphorylation 19413330 USP21 140 S Phosphorylation 19413330 USP21 75 G Proteolytic Cleavage 9353319

PTM - BioGRID Entrez Gene BioGRID ID Position Code Type PMIDs 27005 117950 - K Ubiquitination 22118674 27005 117950 - K Ubiquitination 21906983 27005 117950 - K Ubiquitination 21399617 27005 117950 - K Ubiquitination 23287719

PTM - mUbiSiDa Gene Name Species Ubiquitination Site Ubiquitination Sequence Evidence PMID USP21 Homo sapiens (Human) 413; 407 "413,KGFAGGKVSLRDC; 407,SLPIPKKGFAGGK" 413:21906983; 407:21906983 USP21 Homo sapiens (Human) 413; 407 "413,KGFAGGKVSLRDC; 407,SLPIPKKGFAGGK" 413:21906983; 407:21906983 USP21 Homo sapiens (Human) 413; 407 "413,KGFAGGKVSLRDC; 407,SLPIPKKGFAGGK" 413:21906983; 407:21906983