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Table 1 Comparison of numbers of protease genes in Arabidopsis and Populus. Families highlighted in bold are those that have been examined in most depth in this study.

From: Protease gene families in Populus and Arabidopsis

PROTEASE CLASS MEROPS FAMILY FAMILY DESCRIPTION Number of Genes in Arabidopsis Number of Genes in Populus
Threonine T1 Proteasome family 25 32
  T2 Peptidase family T2 4 5
  T3 gamma-glutamyltransferase family 4 3
Cysteine C1 Papain-like 38 44
  C12 ubiquitin C-terminal hydrolase family 3 3
  C13 VPE 5 7
  C14 Metacaspases 10 16
  C15 pyroglutamyl peptidase I family 1 3
  C19 ubiquitin-specific protease family 32 49
  C26 gamma-glutamyl hydrolase family 5 4
  C44 Peptidase family C44 8 10
  C48 Ulp1endopeptidase family 77 13
  C54 Aut2 peptidase family 3 3
  C56 PfpI endopeptidase family 5 7
  C65 Peptidase family C65 1 2
Serine S1 Chymotrypsin family (Deg) 16 18
  S8 Subtilisin family 65 72
  S9 Prolyl oligopeptidase family 45 68
  S10 Peptidase family S10 57 51
  S12 D-Ala-D-Ala carboxypeptidase B family 1 1
  S14 ClpP endopeptidase family 26 53
  S16 Lon protease family 11 17
  S26 Signal peptidase I family 20 24
  S28 Peptidase family S28 7 18
  S33 Peptidase family S33 51 68
  S41 C-terminal processing peptidase family 3 4
  S49 protease IV family (SppA) 1 3
  S54 Rhomboid family 15 16
  S59 Peptidase family S59 3 3
Metallo M1 Peptidase family M1 3 8
  M3 Peptidase family M3 4 5
  M8 leishmanolysin family 1 1
  M10 Peptidase family M10 5 6
  M14 carboxypeptidase A family 2 4
  M16 pitrilysin family 13 11
  M17 leucyl aminopeptidase family 3 3
  M18 Aminopeptidase I 2 3
  M20 Peptidase family M20 13 18
  M22 Peptidase family M22 2 4
  M24 Peptidase family M24 12 16
  M28 Aminopeptidase Y family 5 4
  M38 Beta-aspartyl dipeptidase family 1 3
  M41 FtsH endopeptidase family 12 18
  M48 Ste24 endopeptidase family 3 5
  M50 S2P protease family 4 5
  M67 Peptidase family M67 9 13
Aspartic A1 Pepsin-like proteases 59 74
  A11 Copia transposon endopeptidase family 20 123
  A22 presenilin family 8 14
TOTAL    723 955