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Protein Page:
COL4A3 (human)

Overview
COL4A3 Type IV collagen is the major structural component of glomerular basement membranes (GBM), forming a 'chicken-wire' meshwork together with laminins, proteoglycans and entactin/nidogen. Autoantibodies against the NC1 domain of alpha 3(IV) are found in Goodpasture syndrome, an autoimmune disease of lung and kidney. Defects in COL4A3 are a cause of Alport syndrome autosomal recessive (APSAR). APSAR is characterized by progressive glomerulonephritis, glomerular basement membrane defects, renal failure, sensorineural deafness and specific eye abnormalities (lenticonous and macular flecks). The disorder shows considerable heterogeneity in that families differ in the age of end-stage renal disease and the occurrence of deafness. Defects in COL4A3 are a cause of benign familial hematuria (BFH); also known as thin basement membrane nephropathy. BFH is characterized by persistent hematuria, an electron microscopically detectable thin glomerular basement membrane (GBM) and an autosomal dominant mode of inheritance. Renal function remains normal. In children, differentiation between BFH and AS can be difficult, because both disorders are manifested by persistent hematuria and thin GBM at that age. Defects in COL4A3 are a cause of Alport syndrome autosomal dominant (APSAD). Alport syndrome is characterized by progressive glomerulonephritis, glomerular basement membrane defects, renal failure, sensorineural deafness and specific eye abnormalities (lenticonous and macular flecks). The disorder shows considerable heterogeneity in that families differ in the age of end-stage renal disease and the occurrence of deafness. Belongs to the type IV collagen family. 5 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Secreted; Secreted, signal peptide
Chromosomal Location of Human Ortholog: 2q36-q37
Cellular Component: basement membrane; collagen type IV; endoplasmic reticulum; endoplasmic reticulum lumen; extracellular region; intracellular membrane-bound organelle
Molecular Function: integrin binding; protein binding
Biological Process: blood circulation; caspase activation; cell proliferation; collagen catabolic process; extracellular matrix organization and biogenesis; glomerular basement membrane development; negative regulation of angiogenesis; negative regulation of cell proliferation; sensory perception of sound
Disease: Alport Syndrome, Autosomal Dominant; Alport Syndrome, Autosomal Recessive; Hematuria, Benign Familial
Reference #:  Q01955 (UniProtKB)
Alt. Names/Synonyms: CO4A3; COL4A3; Collagen alpha-3(IV) chain; collagen IV, alpha-3 polypeptide; collagen, type IV, alpha 3 (Goodpasture antigen); Goodpasture antigen; Tumstatin
Gene Symbols: COL4A3
Molecular weight: 161,812 Da
Basal Isoelectric point: 9.28  Predict pI for various phosphorylation states
Select Structure to View Below

COL4A3

Protein Structure Not Found.


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