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Table 1 Ubiquitinases (E3 ligases) and deubiquitinases (proteases) that regulate intracellular signaling

From: Early innate immune response triggered by the human respiratory syncytial virus and its regulation by ubiquitination/deubiquitination processes

Target protein

Enzyme (symbol)

Name

Activity

Ubiquitin linkage

Refs.

RIG-I

TRIM25

Tripartite Motif-containing protein 25

E3 ligase

K63

[44]

RNF135

RING Finger Protein 135

E3 ligase

K63

[122]

TRIM4

Tripartite Motif-containing protein 4

E3 ligase

K63

[181]

MEX3C

Mex-3 RNA binding family member C

E3 ligase

K63

[84]

USP4

Ubiquitin Specific Protease 4

Protease

K48

[172]

RNF122

RING Finger Protein 122

E3 ligase

K48

[174]

RNF125

RING Finger Protein 125

E3 ligase

K48

[5]

CBL (c-Cbl)

Casitas B lineage lymphoma

E3 ligase

K48

[19]

TRIM40

Tripartite Motif-containing protein 40

E3 ligase

K27 and K48

[193]

CYLD

Cylindromatosis

Protease

K63

[42]

USP21

Ubiquitin Specific Protease 21

Protease

K63

[37]

MAVS

TRIM31

Tripartite Motif-containing protein 31

E3 ligase

K63

[93]

TRIM21

Tripartite Motif-containing protein 21

E3 ligase

K27

[180]

RNF125

RING Finger Protein 125

E3 ligase

K48

[5]

SMURF1/2

SMAD Specific E3 ubiquitin-protein ligase 1/2

E3 ligase

K48

[126, 176]

ITCH

Itchy E3 ubiquitin-protein ligase

E3 ligase

K48

[22, 187]

RNF5

RING Finger Protein 5

E3 ligase

K48

[199]

MARCH5

Membrane-associated RING-CH 5

E3 ligase

K48

[186]

TRIM25

Tripartite Motif-containing protein 25

E3 ligase

K48

[16]

MARCH8

Membrane-associated RING-CH 8

E3 ligase

K27

[77]

TRIM29

Tripartite Motif-containing protein 29

E3 ligase

K11

[178]

YOD1 (OTUD2)

Ovarian Tumor Deubiquitinase2

Protease

K63

[94]

TRAF3

RNF166

RING Finger Protein 166

E3 ligase

K63

[18]

HECTD3

HECT Domain E3 Ubiquitin Protein Ligase 3

E3 ligase

K63

[86]

RNF216 (Triad3A)

RING Finger Protein 216

E3 ligase

K48

[120]

OTUB1/2

OTU Deubiquitinase, Ubiquitin Aldehyde Binding 1 and 2

Protease

K63

[88]

ZC3H12A (MCPIP1)

Monocyte Chemotactic Protein-Induced Protein-1

Protease

K63

[20, 91]

TRAF6

TRAF6

TNF Receptor Associated Factor 6

E3 ligase

K63

[85]

RNF166

RING Finger Protein 166

E3 ligase

K63

[18]

ZC3H12A (MCPIP1)

Monocyte Chemotactic Protein-Induced Protein-1

Protease

K63

[91]

OTUB1/2

OTU Deubiquitinase, Ubiquitin Aldehyde Binding 1 and 2

Protease

K63

[88]

TNFAIP3 (A20)

TNFα Induced Protein 3

Protease

K63

[3, 130, 149]

TRIM38

Tripartite Motif-containing protein 38

E3 ligase

K48

[195]

TBK1

MIB1/2

MIB E3 ubiquitin-protein ligase

E3 ligase

K63

[87]

RNF41 (Nrdp1)

RING Finger Protein 41

E3 ligase

K63

[170]

RNF128

RING Finger Protein 128

E3 ligase

K63

[152]

DTX4

Deltex E3 Ubiquitin Ligase 4

E3 ligase

K48

[26]

TRAIP (TRIP)

TRAF Interacting Protein

E3 ligase

K48

[191]

TRIM27

Tripartite Motif-containing protein 27

E3 ligase

K48

[198]

NEMO

TRAF6

TNF Receptor Associated Factor 6

E3 ligase

K63

[31]

TRIM23

Tripartite Motif-containing protein 23

E3 ligase

K27

[4]

LUBAC

Linear Ubiquitin chain Assembly Complex

E3 ligase

M1

[169]

TRAF7

TNF Receptor Associated Factor 7

E3 ligase

K29

[201]

TRIM29

Tripartite Motif-containing protein 29

E3 ligase

K48

[177]

TAK1

TRAF6

TNF Receptor Associated Factor 6

E3 ligase

K63

[171]

CYLD

Cylindromatosis

Protease

K63

[1]

ITCH

Itchy E3 ubiquitin-protein ligase

Protease

K63

[1]

TBK1-IKK complex

TNFAIP3 (A20)

TNFα Induced Protein 3

Protease

K63

[46, 127, 144]

IRF3

TRIM26

Tripartite Motif-containing protein 26

E3 ligase

K48

[173]

TRIM21

Tripartite Motif-containing protein 21

E3 ligase

K48

[66]

RBCK1 (RNF54)

RING Finger Protein 54

E3 ligase

K48

[190]

CBL (c-Cbl)

Casitas B lineage lymphoma

E3 ligase

K48

[196]

UBE3C (RAUL)

Ubiquitin Protein Ligase E3C

E3 ligase

K48

[188]

IRF7

UBE3C (RAUL)

Ubiquitin Protein Ligase E3C

E3 ligase

K48

[188]

TRIM21

Tripartite Motif-containing protein 21

E3 ligase

K48

[65]

NF-κB

MKRN2

Makorin Ring Finger Protein 2

E3 ligase

K48

[151]

PDLIM1

PDZ And LIM Domain 1

E3 ligase

K48

[163]

COMMD1/Cul2

Copper Metabolism Domain Containing 1/Cullin 2

E3 ligase

K48

[48]

TRAF7

TNF Receptor Associated Factor 7

E3 ligase

K29

[201]

STAT1

RNF31

RING Finger Protein 31

E3 ligase

M1

[202]

OTULIN

OTU deubiquitinase with Linear linkage specificity

Protease

M1

[202]

  1. Ubiquitination/deubiquitination processes regulate many proteins involved in RIG-I and TLR3 signaling pathways. Different E3 ligases (add ubiquitin chains to the target protein) or proteases (remove the ubiquitin chains from the target protein) modify the activity, localization, or stability of the target proteins. E3 ligases add ubiquitin residues to the target proteins; proteases (deubiquitinases) remove ubiquitin residues from the target proteins