Summary: Thrombospondin type 1 domain
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Thrombospondin Edit Wikipedia article
|Thrombospondin type 1 domain|
The thrombospondins (TSP) are a family of multifunctional proteins. The family consists of thrombospondins 1-5 and can be divided into 2 subgroups: A, which contains TSP-1 and -2, and B, which contains TSP-3, -4 and -5 (also designated cartilage oligomeric protein or COMP). TSP-1 and -2 are homotrimers, consisting of three identical subunits, whereas TSP-3, -4 and -5 are homopentamers.
Thrombospondin 1 (TSP-1) is encoded by THBS1. It was first isolated from platelets that had been stimulated with thrombin, and so was designated 'thrombin-sensitive protein'. Since its first recognition, functions for TSP-1 have been found in multiple biological processes including angiogenesis, apoptosis, activation of TGF-beta and Immune regulation. As such, TSP-1 is designated a multifunctional protein.
TSP-1 is an antiangiogenic, inhibiting the proliferation and migration of endothelial cells by interactions with CD36 expressed on their surface of these cells. Inhibitory peptides and fragments of TSP1 bind to CD36, leading to the expression of FAS ligand (FasL), which activates its specific, ubiquitous receptor, Fas. This leads to the activation of caspases and apoptosis of the cell. Since tumors overexpressing TSP-1 typically grow slower, exhibit less angiogenesis, and have fewer metastases, TSP1 is an attractive target for cancer treatment. Because TSP1 is extremely large (~120 kDa monomer), not very abundant and exerts multiple actions, its clinical usefulness is questionable. However, small-molecules based on a CD36-binding peptide sequence from TSP1 are being tested. One analog, ABT-510, exhibits potent proapoptotic activity in cultured cells, while clinically it is very well tolerated with therapeutic benefits reported against several malignancies. ABT-510 is being evaluated in phase II clinical trials for the treatment of several types of cancer.
Human proteins containing this domain
ADAMTS1; ADAMTS10; ADAMTS12; ADAMTS13; ADAMTS14; ADAMTS15; ADAMTS16; ADAMTS17; ADAMTS18; ADAMTS19; ADAMTS2; ADAMTS20; ADAMTS3; ADAMTS4; ADAMTS5; ADAMTS6; ADAMTS7; ADAMTS8; ADAMTS9; ADAMTSL1; ADAMTSL2; ADAMTSL3; ADAMTSL4; ADAMTSL5; BAI1; BAI2; BAI3; C6; C7; C8A; C8B; C9; C9orf8; C9orf94; CFP; CILP; CILP2; CTGF; CYR61; HMCN1; LIBC; NOV; PAPLN; RSPO1; RSPO3; SEMA5A; SEMA5B; SPON1; SPON2; SSPO; THBS1; THBS2; THSD1; THSD3; THSD7A; THSD7B; UNC5A; UNC5B; UNC5C; UNC5D; WISP1; WISP2; WISP3;
- Baenziger NL, Brodie GN, Majerus PW (January 1971). "A Thrombin-Sensitive Protein of Human Platelet Membranes". Proc. Natl. Acad. Sci. U.S.A. 68 (1): 240–3. doi:10.1073/pnas.68.1.240. PMC 391203. PMID 5276296.
- Christopherson KS, Ullian EM, Stokes CC,Mullowney CE, Hell JW, Agah A, Lawler J, Mosher DF, Bornstein P, Barres BA. (2005). "Thrombospondins are astrocyte-secreted proteins that promote CNS synaptogenesis". Cell 120 (3): 421–33. doi:10.1016/j.cell.2004.12.020. PMID 15707899.
- Haviv F, Bradley MF, Kalvin DM, et al. (April 2005). "Thrombospondin-1 mimetic peptide inhibitors of angiogenesis and tumor growth: design, synthesis, and optimization of pharmacokinetics and biological activities". Journal of Medicinal Chemistry 48 (8): 2838–46. doi:10.1021/jm0401560. PMID 15828822.
- Sorbera LA, Bayes M (2005). "ABT-510: oncolytic angiogenesis inhibitor". Drugs of the future (Prous Science) 30 (11): 1081–6. doi:10.1358/dof.2005.030.11.949588.
Thrombospondin type 1 domain Provide feedback
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External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR000884
Thrombospondins are multimeric multidomain glycoproteins that function at cell surfaces and in the extracellular matrix milieu. They act as regulators of cell interactions in vertebrates. They are divided into two subfamilies, A and B, according to their overall molecular organisation. The subgroup A proteins TSP-1 and -2 contain an N-terminal domain, a VWFC domain, three TSP1 repeats, three EGF-like domains, TSP3 repeats and a C-terminal domain. They are assembled as trimer. The subgroup B thrombospondins, designated TSP-3, -4, and COMP (cartilage oligomeric matrix protein, also designated TSP-5) are distinct in that they contain unique N-terminal regions, lack the VWFC domain and TSP1 repeats, contain four copies of EGF-like domains, and are assembled as pentamers [PUBMED:11687483]. EGF, TSP3 repeats and the C-terminal domain are thus the hallmark of a thrombospondin.
This repeat was first described in 1986 by Lawler and Hynes [PUBMED:2430973]. It was found in the thrombospondin protein where it is repeated 3 times. Now a number of proteins involved in the complement pathway (properdin, C6, C7, C8A, C8B, C9) [PUBMED:2459396] as well as extracellular matrix protein like mindin, F-spondin [PUBMED:10409509], SCO-spondin and even the circumsporozoite surface protein 2 and TRAP proteins of Plasmodium [PUBMED:10508153, PUBMED:1501644] contain one or more instance of this repeat. It has been involved in cell-cell interaction, inhibition of angiogenesis [PUBMED:10500044] and apoptosis [PUBMED:9135017].
The intron-exon organisation of the properdin gene confirms the hypothesis that the repeat might have evolved by a process involving exon shuffling [PUBMED:1417780]. A study of properdin structure provides some information about the structure of the thrombospondin type I repeat [PUBMED:1868073].
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Curation and family details
|Number in seed:||31|
|Number in full:||18854|
|Average length of the domain:||50.30 aa|
|Average identity of full alignment:||28 %|
|Average coverage of the sequence by the domain:||19.16 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||14|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the TSP_1 domain has been found. There are 25 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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