View source for 1cou


==ANTICOAGULANT PROTEIN FROM THE NEMATODE ANCYLOSTOMA CANINUM==
<StructureSection load='1cou' size='340' side='right'caption='[[1cou]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1cou]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Ancylostoma_caninum Ancylostoma caninum]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1COU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1COU FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 18 models</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1cou FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cou OCA], [https://pdbe.org/1cou PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cou RCSB], [https://www.ebi.ac.uk/pdbsum/1cou PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cou ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/Q16938_ANCCA Q16938_ANCCA] 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/co/1cou_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1cou ConSurf].
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== Publication Abstract from PubMed ==
Nematode anticoagulant proteins (NAPs) from the hematophagous nematode Ancylostoma caninum inhibit blood coagulation with picomolar inhibition constants, and have been targeted as novel pharmaceutical agents. NAP5 and NAP6 inhibit factor Xa by binding to its active site, whereas NAPc2 binds to factor Xa at a different, as yet unidentified, site and the resultant binary complex inhibits the tissue factor-factor VIIa complex. We have undertaken NMR studies of NAPc2, including the calculation of a solution structure, and found that the protein is folded, with five disulfide bonds, but is extremely flexible, especially in the acidic loop. The Halpha secondary shifts and 3JHNHalpha coupling constants indicate the presence of some beta structure and a short helix, but the intervening loops are highly conformationally heterogeneous. Heteronuclear NOE measurements showed the presence of large amplitude motions on a subnanosecond timescale at the N-terminus and C-terminus and in the substrate-binding loop, indicating that the conformational heterogeneity observed in the NMR structures is due to flexibility of the polypeptide chain in these regions. Flexibility may well be an important factor in the physiological function of NAPc2, because it must interact with other proteins in the inhibition of blood coagulation. We suggest that this inhibitor is likely to become structured on binding to factor Xa, because the inhibition of the tissue factor-factor VIIa complex requires both NAPc2 and factor Xa.

Inherent flexibility in a potent inhibitor of blood coagulation, recombinant nematode anticoagulant protein c2.,Duggan BM, Dyson HJ, Wright PE Eur J Biochem. 1999 Oct;265(2):539-48. PMID:10504384<ref>PMID:10504384</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Ancylostoma caninum]]
[[Category: Large Structures]]
[[Category: Duggan BM]]
[[Category: Dyson HJ]]
[[Category: Wright PE]]