| Structural highlights
Disease
[ANT3_HUMAN] Defects in SERPINC1 are the cause of antithrombin III deficiency (AT3D) [MIM:613118]. AT3D is an important risk factor for hereditary thrombophilia, a hemostatic disorder characterized by a tendency to recurrent thrombosis. AT3D is classified into 4 types. Type I: characterized by a 50% decrease in antigenic and functional levels. Type II: has defects affecting the thrombin-binding domain. Type III: alteration of the heparin-binding domain. Plasma AT-III antigen levels are normal in type II and III. Type IV: consists of miscellaneous group of unclassifiable mutations.[1] [:][2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [:][23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35]
Function
[ANT3_HUMAN] Most important serine protease inhibitor in plasma that regulates the blood coagulation cascade. AT-III inhibits thrombin, matriptase-3/TMPRSS7, as well as factors IXa, Xa and XIa. Its inhibitory activity is greatly enhanced in the presence of heparin.[36]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Many of the late-onset dementias, including Alzheimer's disease and the prion encephalopathies, arise from the aberrant aggregation of individual proteins. The serpin family of serine protease inhibitors provides a well-defined structural example of such pathological aggregation, as its mutant variants readily form long-chain polymers, resulting in diseases ranging from thrombosis to dementia. The intermolecular linkages result from the insertion of the reactive site loop of one serpin molecule into the middle strand (s4A) position of the A beta-sheet of another molecule. We define here the structural requirements for small peptides to competitively bind to and block the s4A position to prevent this intermolecular linkage and polymerisation. The entry and anchoring of blocking-peptides is facilitated by the presence of a threonine which inserts into the site equivalent to P8 of s4A. But the critical requirement for small blocking-peptides is demonstrated in crystallographic structures of the complexes formed with selected tri- and tetrapeptides. These structures indicate that the binding is primarily due to the insertion of peptide hydrophobic side-chains into the P4 and P6 sites of s4A. The findings allow the rational design of synthetic blocking-peptides small enough to be suitable for mimetic design. This is demonstrated here with a tetrapeptide that preferentially blocks the polymerisation of a pathologically unstable serpin commonly present in people of European descent.
How small peptides block and reverse serpin polymerisation.,Zhou A, Stein PE, Huntington JA, Sivasothy P, Lomas DA, Carrell RW J Mol Biol. 2004 Sep 17;342(3):931-41. PMID:15342247[37]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
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- ↑ Koide T, Odani S, Takahashi K, Ono T, Sakuragawa N. Antithrombin III Toyama: replacement of arginine-47 by cysteine in hereditary abnormal antithrombin III that lacks heparin-binding ability. Proc Natl Acad Sci U S A. 1984 Jan;81(2):289-93. PMID:6582486
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- ↑ Perry DJ, Daly M, Harper PL, Tait RC, Price J, Walker ID, Carrell RW. Antithrombin Cambridge II, 384 Ala to Ser. Further evidence of the role of the reactive centre loop in the inhibitory function of the serpins. FEBS Lett. 1991 Jul 22;285(2):248-50. PMID:1906811
- ↑ Olds RJ, Lane DA, Boisclair M, Sas G, Bock SC, Thein SL. Antithrombin Budapest 3. An antithrombin variant with reduced heparin affinity resulting from the substitution L99F. FEBS Lett. 1992 Apr 6;300(3):241-6. PMID:1555650
- ↑ Blajchman MA, Fernandez-Rachubinski F, Sheffield WP, Austin RC, Schulman S. Antithrombin-III-Stockholm: a codon 392 (Gly----Asp) mutation with normal heparin binding and impaired serine protease reactivity. Blood. 1992 Mar 15;79(6):1428-34. PMID:1547341
- ↑ Okajima K, Abe H, Maeda S, Motomura M, Tsujihata M, Nagataki S, Okabe H, Takatsuki K. Antithrombin III Nagasaki (Ser116-Pro): a heterozygous variant with defective heparin binding associated with thrombosis. Blood. 1993 Mar 1;81(5):1300-5. PMID:8443391
- ↑ Olds RJ, Lane DA, Beresford CH, Abildgaard U, Hughes PM, Thein SL. A recurrent deletion in the antithrombin gene, AT106-108(-6 bp), identified by DNA heteroduplex detection. Genomics. 1993 Apr;16(1):298-9. PMID:8486379 doi:http://dx.doi.org/10.1006/geno.1993.1184
- ↑ Emmerich J, Vidaud D, Alhenc-Gelas M, Chadeuf G, Gouault-Heilmann M, Aillaud MF, Aiach M. Three novel mutations of antithrombin inducing high-molecular-mass compounds. Arterioscler Thromb. 1994 Dec;14(12):1958-65. PMID:7981186
- ↑ Millar DS, Wacey AI, Ribando J, Melissari E, Laursen B, Woods P, Kakkar VV, Cooper DN. Three novel missense mutations in the antithrombin III (AT3) gene causing recurrent venous thrombosis. Hum Genet. 1994 Nov;94(5):509-12. PMID:7959685
- ↑ Jochmans K, Lissens W, Vervoort R, Peeters S, De Waele M, Liebaers I. Antithrombin-Gly 424 Arg: a novel point mutation responsible for type 1 antithrombin deficiency and neonatal thrombosis. Blood. 1994 Jan 1;83(1):146-51. PMID:8274732
- ↑ van Boven HH, Olds RJ, Thein SL, Reitsma PH, Lane DA, Briet E, Vandenbroucke JP, Rosendaal FR. Hereditary antithrombin deficiency: heterogeneity of the molecular basis and mortality in Dutch families. Blood. 1994 Dec 15;84(12):4209-13. PMID:7994035
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- ↑ Emmerich J, Chadeuf G, Alhenc-Gelas M, Gouault-Heilman M, Toulon P, Fiessinger JN, Aiach M. Molecular basis of antithrombin type I deficiency: the first large in-frame deletion and two novel mutations in exon 6. Thromb Haemost. 1994 Oct;72(4):534-9. PMID:7878627
- ↑ Okajima K, Abe H, Wagatsuma M, Okabe H, Takatsuki K. Antithrombin III Kumamoto II; a single mutation at Arg393-His increased the affinity of antithrombin III for heparin. Am J Hematol. 1995 Jan;48(1):12-8. PMID:7832187
- ↑ Ozawa T, Takikawa Y, Niiya K, Fujiwara T, Suzuki K, Sato S, Sakuragawa N. Antithrombin Morioka (Cys 95-Arg): a novel missense mutation causing type I antithrombin deficiency. Thromb Haemost. 1997 Feb;77(2):403. PMID:9157604
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- ↑ Jochmans K, Lissens W, Seneca S, Capel P, Chatelain B, Meeus P, Osselaer JC, Peerlinck K, Seghers J, Slacmeulder M, Stibbe J, van de Loo J, Vermylen J, Liebaers I, De Waele M. The molecular basis of antithrombin deficiency in Belgian and Dutch families. Thromb Haemost. 1998 Sep;80(3):376-81. PMID:9759613
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- ↑ Picard V, Dautzenberg MD, Villoutreix BO, Orliaguet G, Alhenc-Gelas M, Aiach M. Antithrombin Phe229Leu: a new homozygous variant leading to spontaneous antithrombin polymerization in vivo associated with severe childhood thrombosis. Blood. 2003 Aug 1;102(3):919-25. Epub 2003 Feb 20. PMID:12595305 doi:10.1182/blood-2002-11-3391
- ↑ Nagaizumi K, Inaba H, Amano K, Suzuki M, Arai M, Fukutake K. Five novel and four recurrent point mutations in the antithrombin gene causing venous thrombosis. Int J Hematol. 2003 Jul;78(1):79-83. PMID:12894857
- ↑ David D, Ribeiro S, Ferrao L, Gago T, Crespo F. Molecular basis of inherited antithrombin deficiency in Portuguese families: identification of genetic alterations and screening for additional thrombotic risk factors. Am J Hematol. 2004 Jun;76(2):163-71. PMID:15164384 doi:10.1002/ajh.20067
- ↑ Kuhli C, Jochmans K, Scharrer I, Luchtenberg M, Hattenbach LO. Retinal vein occlusion associated with antithrombin deficiency secondary to a novel G9840C missense mutation. Arch Ophthalmol. 2006 Aug;124(8):1165-9. PMID:16908819 doi:10.1001/archopht.124.8.1165
- ↑ Szabo R, Netzel-Arnett S, Hobson JP, Antalis TM, Bugge TH. Matriptase-3 is a novel phylogenetically preserved membrane-anchored serine protease with broad serpin reactivity. Biochem J. 2005 Aug 15;390(Pt 1):231-42. PMID:15853774 doi:BJ20050299
- ↑ Zhou A, Stein PE, Huntington JA, Sivasothy P, Lomas DA, Carrell RW. How small peptides block and reverse serpin polymerisation. J Mol Biol. 2004 Sep 17;342(3):931-41. PMID:15342247 doi:http://dx.doi.org/10.1016/j.jmb.2004.07.078
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