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Thrombomodulin

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(Redirected fromTHBD)

THBD
Available structures
PDBOrtholog search:PDBeRCSB
Identifiers
AliasesTHBD,AHUS6, BDCA3, CD141, THPH12, THRM, TM, thrombomodulin, BDCA-3
External IDsOMIM:188040;MGI:98736;HomoloGene:308;GeneCards:THBD;OMA:THBD - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_000361

NM_009378

RefSeq (protein)

NP_000352

NP_033404

Location (UCSC)Chr 20: 23.05 – 23.05 MbChr 2: 148.25 – 148.25 Mb
PubMedsearch[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Thrombomodulin(TM),CD141 or BDCA-3 is anintegral membrane proteinexpressed on the surface ofendothelial cellsand serves as a cofactor forthrombin.It reducesblood coagulationby converting thrombin to an anticoagulantenzymefrom a procoagulant enzyme.[5]Thrombomodulin is also expressed on humanmesothelial cell,[6]monocyteand adendritic cellsubset.

Genetics and structure

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In humans, thrombomodulin is encoded by theTHBDgene.[7]The protein has a molecular mass of 74kDa,and consists of a single chain with six tandemly repeatedEGF-like domains,aSerine/Threonine-rich spacer and atransmembranedomain.[8] It is a member of theC-type lectin domain(CTLD) group 14 family.[9]

Function

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Thrombomodulin functions as acofactorin thethrombin-induced activation ofprotein Cin theanticoagulantpathway by forming a 1:1 stoichiometric complex with thrombin. This raises the speed of protein C activation thousandfold. Thrombomodulin-bound thrombin has procoagulant effect at the same time by inhibiting fibrinolysis by cleavingthrombin-activatable fibrinolysis inhibitor(TAFI, aka carboxypeptidase B2) into its active form.[citation needed]

Thrombomodulin is aglycoproteinon the surface of endothelial cells that, in addition to binding thrombin, regulatesC3binactivation by factor I. Mutations in the thrombomodulin gene (THBD) have also been reported to be associated withatypical hemolytic-uremic syndrome(aHUS).[10]

Theantigendescribed as BDCA-3[11]has turned out to be identical to thrombomodulin.[12]Thus, it was revealed that this molecule also occurs on a very rare (0.02%) subset of humandendritic cellscalled MDC2. Its function on these cells is unknown.[citation needed]

Interactions

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Thrombomodulin has been shown tointeractwiththrombin.[13][14]

References

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  1. ^abcGRCh38: Ensembl release 89: ENSG00000178726Ensembl,May 2017
  2. ^abcGRCm38: Ensembl release 89: ENSMUSG00000074743Ensembl,May 2017
  3. ^"Human PubMed Reference:".National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^"Mouse PubMed Reference:".National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^IPR001491 ThrombomodulinAccessed January 19, 2012.
  6. ^Verhagen HJ, Heijnen-Snyder GJ, Pronk A, Vroom TM, van Vroonhoven TJ, Eikelboom BC, et al. (December 1996). "Thrombomodulin activity on mesothelial cells: perspectives for mesothelial cells as an alternative for endothelial cells for cell seeding on vascular grafts".British Journal of Haematology.95(3): 542–549.doi:10.1046/j.1365-2141.1996.d01-1935.x.PMID8943899.S2CID8417511.
  7. ^Wen DZ, Dittman WA, Ye RD, Deaven LL, Majerus PW, Sadler JE (July 1987). "Human thrombomodulin: complete cDNA sequence and chromosome localization of the gene".Biochemistry.26(14): 4350–4357.doi:10.1021/bi00388a025.PMID2822087.
  8. ^Sadler JE(July 1997). "Thrombomodulin structure and function".Thrombosis and Haemostasis.78(1): 392–395.doi:10.1055/s-0038-1657558.PMID9198185.S2CID32297505.
  9. ^Khan KA, McMurray JL, Mohammed F, Bicknell R (September 2019)."C-type lectin domain group 14 proteins in vascular biology, cancer and inflammation".The FEBS Journal.286(17): 3299–3332.doi:10.1111/febs.14985.PMC6852297.PMID31287944.
  10. ^Delvaeye M, Noris M, De Vriese A, Esmon CT, Esmon NL, Ferrell G, et al. (July 2009)."Thrombomodulin mutations in atypical hemolytic-uremic syndrome".The New England Journal of Medicine.361(4): 345–357.doi:10.1056/NEJMoa0810739.PMC3530919.PMID19625716.
  11. ^Dzionek A, Fuchs A, Schmidt P, Cremer S, Zysk M, Miltenyi S, et al. (December 2000)."BDCA-2, BDCA-3, and BDCA-4: three markers for distinct subsets of dendritic cells in human peripheral blood".Journal of Immunology.165(11): 6037–6046.doi:10.4049/jimmunol.165.11.6037.PMID11086035.
  12. ^Dzionek A, Inagaki Y, Okawa K, Nagafune J, Röck J, Sohma Y, et al. (December 2002). "Plasmacytoid dendritic cells: from specific surface markers to specific cellular functions".Human Immunology.63(12): 1133–1148.doi:10.1016/S0198-8859(02)00752-8.PMID12480257.
  13. ^Bajzar L, Morser J, Nesheim M (July 1996)."TAFI, or plasma procarboxypeptidase B, couples the coagulation and fibrinolytic cascades through the thrombin-thrombomodulin complex".The Journal of Biological Chemistry.271(28): 16603–16608.doi:10.1074/jbc.271.28.16603.PMID8663147.
  14. ^Jakubowski HV, Owen WG (July 1989)."Macromolecular specificity determinants on thrombin for fibrinogen and thrombomodulin".The Journal of Biological Chemistry.264(19): 11117–11121.doi:10.1016/S0021-9258(18)60437-5.PMID2544585.

Further reading

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