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1avg

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Revision as of 07:59, 25 December 2014

THROMBIN INHIBITOR FROM TRIATOMA PALLIDIPENNIS

Structural highlights

1avg is a 3 chain structure with sequence from Bos taurus and Triatoma pallidipennis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Activity:	Thrombin, with EC number 3.4.21.5
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[THRB_BOVIN] Thrombin, which cleaves bonds after Arg and Lys, converts fibrinogen to fibrin and activates factors V, VII, VIII, XIII, and, in complex with thrombomodulin, protein C. Functions in blood homeostasis, inflammation and wound healing (By similarity). [TRIA_TRIPA] Thrombin inhibitor, forms a non-covalent complex with thrombin at a molar ratio of 1:1, inhibits thrombin-induced platelet aggregation, and prolongs thrombin clotting time and activated partial thromboplastin time. It only minimally suppresses the amidolytic activity of thrombin.

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

Triabin, a 142-residue protein from the saliva of the blood-sucking triatomine bug Triatoma pallidipennis, is a potent and selective thrombin inhibitor. Its stoichiometric complex with bovine alpha-thrombin was crystallized, and its crystal structure was solved by Patterson search methods and refined at 2.6-A resolution to an R value of 0.184. The analysis revealed that triabin is a compact one-domain molecule essentially consisting of an eight-stranded beta-barrel. The eight strands A to H are arranged in the order A-C-B-D-E-F-G-H, with the first four strands exhibiting a hitherto unobserved up-up-down-down topology. Except for the B-C inversion, the triabin fold exhibits the regular up-and-down topology of lipocalins. In contrast to the typical ligand-binding lipocalins, however, the triabin barrel encloses a hydrophobic core intersected by a unique salt-bridge cluster. Triabin interacts with thrombin exclusively via its fibrinogen-recognition exosite. Surprisingly, most of the interface interactions are hydrophobic. A prominent exception represents thrombin's Arg-77A side chain, which extends into a hydrophobic triabin pocket forming partially buried salt bridges with Glu-128 and Asp-135 of the inhibitor. The fully accessible active site of thrombin in this complex is in agreement with its retained hydrolytic activity toward small chromogenic substrates. Impairment of thrombin's fibrinogen converting activity or of its thrombomodulin-mediated protein C activation capacity upon triabin binding is explained by usage of overlapping interaction sites of fibrinogen, thrombomodulin, and triabin on thrombin. These data demonstrate that triabin inhibits thrombin via a novel and unique mechanism that might be of interest in the context of potential therapeutic applications.

Structure of the thrombin complex with triabin, a lipocalin-like exosite-binding inhibitor derived from a triatomine bug.,Fuentes-Prior P, Noeske-Jungblut C, Donner P, Schleuning WD, Huber R, Bode W Proc Natl Acad Sci U S A. 1997 Oct 28;94(22):11845-50. PMID:9342325^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Fuentes-Prior P, Noeske-Jungblut C, Donner P, Schleuning WD, Huber R, Bode W. Structure of the thrombin complex with triabin, a lipocalin-like exosite-binding inhibitor derived from a triatomine bug. Proc Natl Acad Sci U S A. 1997 Oct 28;94(22):11845-50. PMID:9342325

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1avg"

@@ Line 6: / Line 6: @@
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1avg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1avg OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1avg RCSB], [http://www.ebi.ac.uk/pdbsum/1avg PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/THRB_BOVIN THRB_BOVIN]] Thrombin, which cleaves bonds after Arg and Lys, converts fibrinogen to fibrin and activates factors V, VII, VIII, XIII, and, in complex with thrombomodulin, protein C. Functions in blood homeostasis, inflammation and wound healing (By similarity). [[http://www.uniprot.org/uniprot/TRIA_TRIPA TRIA_TRIPA]] Thrombin inhibitor, forms a non-covalent complex with thrombin at a molar ratio of 1:1, inhibits thrombin-induced platelet aggregation, and prolongs thrombin clotting time and activated partial thromboplastin time. It only minimally suppresses the amidolytic activity of thrombin.
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]

1avg

From Proteopedia

Revision as of 07:59, 25 December 2014

THROMBIN INHIBITOR FROM TRIATOMA PALLIDIPENNIS

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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