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Tbio
C4A
Complement C4-A

Protein Summary
Description
Non-enzymatic component of C3 and C5 convertases and thus essential for the propagation of the classical complement pathway. Covalently binds to immunoglobulins and immune complexes and enhances the solubilization of immune aggregates and the clearance of IC through CR1 on erythrocytes. C4A isotype is responsible for effective binding to form amide bonds with immune aggregates or protein antigens, while C4B isotype catalyzes the transacylation of the thioester carbonyl group to form ester bonds with carbohydrate antigens. Derived from proteolytic degradation of complement C4, C4a anaphylatoxin is a mediator of local inflammatory process. It induces the contraction of smooth muscle, increases vascular permeability and causes histamine release from mast cells and basophilic leukocytes. This gene encodes the acidic form of complement factor 4, part of the classical activation pathway. The protein is expressed as a single chain precursor which is proteolytically cleaved into a trimer of al ...more
Illumination Graph
Knowledge Table
Most Knowledge About
Knowledge Value (0 to 1 scale)
biological process
0
biological term
0
cell line
0
cell type or tissue
0
cellular component
0


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IDG Development Level Summary
Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 1663.63   (req: < 5)
Gene RIFs: 89   (req: <= 3)
Antibodies: 584   (req: <= 50)
Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 1663.63   (req: >= 5)
Gene RIFs: 89   (req: > 3)
Antibodies: 584   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 11
Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligand: 0
Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 0
Orthologs (1)
1 – 1 of 1
Species
Name
Source ID
Gene ID
OMA
EggNOG
Inparanoid
Xenopus
complement component 4A (Rodgers blood group)
XB-GENE-478881
100135012
Species
Name
OMA
EggNOG
Inparanoid
Xenopus
complement component 4A (Rodgers blood group)
Protein Data Bank (7)
1 – 5 of 7
PDB Structure Id
Ligand
Method
Resolution (Å)
M.W. (kDa)
Pub Year
Title
PDB Structure Id
M.W.
Resolution
Pub Year
Pathways (40)
Activation of C3 and C5 (R-HSA-174577)

Click on a row in the table to change the structure displayed.

Items per page:
1 – 5 of 10
Data Source
Name
Explore in Pharos
Explore in Source
Reactome
Activation of C3 and C5
Reactome
Complement cascade
Reactome
Immune System
Reactome
Initial triggering of complement
Reactome
Innate Immune System
Name
Explore in Pharos
Explore in Source
Activation of C3 and C5
Complement cascade
Immune System
Initial triggering of complement
Innate Immune System
Protein-Protein Interactions (311)
1 – 10 of 311
SNX27
Tbio
Novelty: 0.02419724
p_int: 0.999978144
p_ni: 0.000021856
Data Source: BioPlex
PVR
Tbio
Novelty: 0.00215811
p_int: 0.999917355
p_ni: 0.000082645
p_wrong: 1e-9
Score: 0.199
Data Source: BioPlex,STRINGDB
GDPD1
Tbio
Family: Enzyme
Novelty: 0.28722153
p_int: 0.999543977
p_ni: 0.00039224
p_wrong: 0.000063782
Score: 0.153
Data Source: BioPlex,STRINGDB
SLC15A1
Tchem
Family: Transporter
Novelty: 0.00149723
p_int: 0.999390947
p_ni: 0.000609053
Data Source: BioPlex
MSMB
Tbio
Novelty: 0.00241546
p_int: 0.999372886
p_ni: 0.000382114
p_wrong: 0.000245
Data Source: BioPlex
FAM171B
Tdark
Novelty: 0.38456365
p_int: 0.998677987
p_ni: 0.001322012
Score: 0.161
Data Source: BioPlex,STRINGDB
SCN2B
Tbio
Family: IC
Novelty: 0.03773629
p_int: 0.998492802
p_ni: 0.001507148
p_wrong: 5e-8
Data Source: BioPlex
OCLN
Tbio
Novelty: 0.00047671
p_int: 0.997900461
p_ni: 0.001475763
p_wrong: 0.000623776
Score: 0.155
Data Source: BioPlex,STRINGDB
CCL5
Tchem
Novelty: 0.00032607
p_int: 0.996994267
p_ni: 0.002485949
p_wrong: 0.000519783
Score: 0.357
Data Source: BioPlex,STRINGDB
LGALS8
Tchem
Novelty: 0.00623836
p_int: 0.996479377
p_ni: 0.003520384
p_wrong: 2.39e-7
Score: 0.168
Data Source: BioPlex,STRINGDB
Publication Statistics
PubMed Score  1663.63

PubMed score by year
PubTator Score  2652.34

PubTator score by year
Amino Acid Sequence
Residue Counts
Protein Sequence
ProtVista Viewer
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