Tbio COL18A1 Collagen alpha-1(XVIII) chain

Protein Summary

Description

Probably plays a major role in determining the retinal structure as well as in the closure of the neural tube. Non-collagenous domain 1: May regulate extracellular matrix-dependent motility and morphogenesis of endothelial and non-endothelial cells; the function requires homotrimerization and implicates MAPK signaling. Endostatin: Potently inhibits endothelial cell proliferation and angiogenesis (PubMed:9459295). May inhibit angiogenesis by binding to the heparan sulfate proteoglycans involved in growth factor signaling (By similarity). Inhibits VEGFA-induced endothelial cell proliferation and migration. Seems to inhibit VEGFA-mediated signaling by blocking the interaction of VEGFA to its receptor KDR/VEGFR2. Modulates endothelial cell migration in an integrin-dependent manner implicating integrin ITGA5:ITGB1 and to a lesser extent ITGAV:ITGB3 and ITGAV:ITGB5 (By similarity). May negatively regulate the activity of homotrimeric non-collagenous domain 1 (PubMed:11257123). This gene encodes the alpha chain of type XVIII collagen. This collagen is one of the multiplexins, extracellular matrix proteins that contain multiple triple-helix domains (collagenous domains) interrupted by non-collagenous domains. A long isoform of the protein has an N-terminal domain that is homologous to the extracellular part of frizzled receptors. Proteolytic processing at several endogenous cleavage sites in the C-terminal domain results in production of endostatin, a potent antiangiogenic protein that is able to inhibit angiogenesis and tumor growth. Mutations in this gene are associated with Knobloch syndrome. The main features of this syndrome involve retinal abnormalities, so type XVIII collagen may play an important role in retinal structure and in neural tube closure. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

Uniprot Accession IDs

• P39060
• A8MVI4
• Q58EX6
• Q6RZ39
• Q6RZ40
• Q6RZ41
• Q8N4S4
• Q8WXI5
• Q96T70
• Q9UK38
• Q9Y6Q7
• Q9Y6Q8

Gene Name

• COL18A1

Ensembl ID

• ENST00000355480
• ENSP00000347665
• ENSG00000182871
• ENST00000359759
• ENSP00000352798
• ENST00000400337
• ENSP00000383191

Symbol

• KS
• KNO
• KNO1

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
protein domain	0.99
transcription factor perturbation	0.98
PubMedID	0.97
disease perturbation	0.95
biological term	0.89

Protein Classes

No PANTHER Classes or DTO Classes found

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: 1489.94   (req: < 5)

Gene RIFs: 146   (req: <= 3)

Antibodies: 545   (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: 1489.94   (req: >= 5)

Gene RIFs: 146   (req: > 3)

Antibodies: 545   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 16

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