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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