Peptidases and Inhibitors

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 Aspartic peptidases
   Family A1: pepsin family
   Family A2: retropepsin family
   Family A5: thermopsin family
   Family A8: signal peptidase II family
   Family A22: presenilin family
   Family A24: type IV prepilin peptidase family
     K02654  pilD, pppA; leader peptidase (prepilin peptidase) / N-methyltransferase [EC:3.4.23.43 2.1.1.-]
     K02464  gspO; general secretion pathway protein O [EC:3.4.23.43 2.1.1.-]
     K10966  tcpJ; toxin coregulated pilus biosynthesis protein J [EC:3.4.23.43 2.1.1.-]
     K02506  hofD, hopD; leader peptidase HopD [EC:3.4.23.43]
     K02278  cpaA, tadV; prepilin peptidase CpaA [EC:3.4.23.43]
     K07991  flaK; archaeal preflagellin peptidase FlaK [EC:3.4.23.52]
   Family A25: gpr protease family
   Family A26: omptin family
   Family A28
   Family A31: HybD endopeptidase family
   Family A36
 
 Cysteine peptidases
 
 Glutamic peptidases
 
 Metallo peptidases
   Family M1
   Family M2
   Family M3
   Family M4: thermolysin family
   Family M5: mycolysin family
   Family M6: immune inhibitor A family
   Family M7: snapalysin family
   Family M8: leishmanolysin family
   Family M9
   Family M10
     K01388  MMP1; matrix metalloproteinase-1 (interstitial collagenase) [EC:3.4.24.7]
     K01398  MMP2; matrix metalloproteinase-2 (gelatinase A) [EC:3.4.24.24]
     K01394  MMP3; matrix metalloproteinase-3 (stromelysin 1, progelatinase) [EC:3.4.24.17]
     K01397  MMP7; matrix metalloproteinase-7 (matrilysin, uterine) [EC:3.4.24.23]
     K01402  MMP8; matrix metalloproteinase-8 (neutrophil collagenase) [EC:3.4.24.34]
     K01403  MMP9; matrix metalloproteinase-9 (gelatinase B) [EC:3.4.24.35]
     K01396  MMP10; matrix metalloproteinase-10 (stromelysin 2) [EC:3.4.24.22]
     K07993  MMP11; matrix metalloproteinase-11 (stromelysin 3) [EC:3.4.24.-]
     K01413  MMP12; matrix metalloproteinase-12 (macrophage elastase) [EC:3.4.24.65]
     K07994  MMP13; matrix metalloproteinase-13 (collagenase 3) [EC:3.4.24.-]
     K07763  MMP14; matrix metalloproteinase-14 (membrane-inserted) [EC:3.4.24.80]
     K07995  MMP15; matrix metalloproteinase-15 (membrane-inserted) [EC:3.4.24.-]
     K07996  MMP16; matrix metalloproteinase-16 (membrane-inserted) [EC:3.4.24.-]
     K07997  MMP17; matrix metalloproteinase-17 (membrane-inserted) [EC:3.4.24.-]
     K07998  MMP19, MMP18; matrix metalloproteinase-19 (RASI) [EC:3.4.24.-]
     K07999  MMP20; matrix metalloproteinase-20 (enamelysin) [EC:3.4.24.-]
     K08000  MMP21; matrix metalloproteinase-21 [EC:3.4.24.-]
     K08001  MMP23; matrix metalloproteinase-23 (CA-MMP) [EC:3.4.24.-]
     K08002  MMP24; matrix metalloproteinase-24 (membrane-inserted) [EC:3.4.24.-]
     K08003  MMP25; matrix metalloproteinase-25 (membrane-inserted) [EC:3.4.24.-]
     K08004  MMP26; matrix metalloproteinase-26 (matrilysin-2, endometase) [EC:3.4.24.-]
     K08005  MMP27; matrix metalloproteinase-27 [EC:3.4.24.-]
     K08006  MMP28; matrix metalloproteinase-28 (epilysin) [EC:3.4.24.-]
     K07761  5MMP; metalloendoproteinase 5-MMP [EC:3.4.24.-]
     K01406  prtC; serralysin [EC:3.4.24.40]
     K19957  HE; envelysin [EC:3.4.24.12]
     K19959  bftP; fragilysin [EC:3.4.24.74]
   Family M12: astacin/adamalysin family
   Family M13: neprilysin family
   Family M14: carboxypeptidase A family
   Family M15: zinc D-Ala-D-Ala carboxypeptidase family
   Family M16: pitrilysin family
   Family M17: leucyl aminopeptidase family
   Family M18
   Family M19: membrane dipeptidase family
   Family M20
   Family M23
   Family M24
   Family M26
   Family M27
   Family M28: aminopeptidase Y family
   Family M29: aminopeptidase T family
   Family M32: carboxypeptidase Taq family
   Family M34: anthrax lethal factor family
   Family M35: deuterolysin family
   Family M36: fungalysin family
   Family M38: beta-aspartyl dipeptidase family
   Family M41: FtsH endopeptidase family
   Family M42: glutamyl aminopeptidase family
   Family M43: cytophagalysin family
   Family M44
   Family M48: Ste24 endopeptidase family
   Family M49: dipeptidyl-peptidase III family
   Family M50: S2P protease family
   Family M54
   Family M55: DppA aminopeptidase family
   Family M56
   Family M67
   Family M72
   Family M73
   Family M74
   Family M80
   Family M82
   Family M85
   Family M88
   Family M90
   Family M98
     K27948  TCAF; TRPM8 channel-associated factor
 
 Asparagine peptide lyases
 
 Mixed peptidases
 
 Serine peptidases
 
 Threonine peptidases
 
 Peptidases of unknown catalytic type
   Family U32
     K08303  prtC, trhP; U32 family peptidase [EC:3.4.-.-]
     K24847  rlhA; 23S rRNA 5-hydroxycytidine C2501 synthase
     K24845  ubiV; 2-(all-trans-polyprenyl)phenol 6-hydroxylase (prephenate) UbiV [EC:1.97.1.15]
     K24844  ubiU; 2-(all-trans-polyprenyl)phenol 6-hydroxylase (prephenate) UbiU [EC:1.97.1.15]
   Family U62
 
 Peptidase inhibitors

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Last updated: July 14, 2026
Classification taken and modified from MEROPS