Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 10 

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NMR structure determination of tick anticoagulant peptide (TAP).

Lim-Wilby, M.S.Hallenga, K.de Maeyer, M.Lasters, I.Vlasuk, G.P.Brunck, T.K.

(1995) Protein Sci 4: 178-186

  • DOI: https://doi.org/10.1002/pro.5560040205
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Tick anticoagulant peptide (TAP) is a potent and selective 60-amino acid inhibitor of the serine protease Factor Xa (fXa), the penultimate enzyme in the blood coagulation cascade. The structural features of TAP responsible for its remarkable specificity for fXa are unknown, but the binding to its target appears to be unique. The elucidation of the TAP structure may facilitate our understanding of this new mode of serine protease inhibition and could provide a basis for the design of novel fXa inhibitors. Analyses of homo- and heteronuclear two-dimensional NMR spectra (total correlation spectroscopy, nuclear Overhauser effect spectroscopy [NOESY], constant time heteronuclear single quantum correlation spectroscopy [CT-HSQC], and HSQC-NOESY; 600 MHz; 1.5 mM TAP; pH 2.5) of unlabeled, 13C-labeled, and 15N-labeled TAP provided nearly complete 1H sequence-specific resonance assignments. Secondary structural elements were identified by characteristic NOE patterns and D2O amide proton-exchange experiments. A three-dimensional structure of TAP was generated from 412 NOESY-derived distance and 47 dihedral angle constraints. The structural elements of TAP are similar in some respects to those of the Kunitz serine protease inhibitor family, with which TAP shares weak sequence homology. This structure, coupled with previous kinetic and biochemical information, confirms previous suggestions that TAP has a unique mode of binding to fXa.

  • Organizational Affiliation

    Corvas International, Inc., San Diego, California 92121, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TICK ANTICOAGULANT PEPTIDE60Ornithodoros moubataMutation(s): 0 
Find proteins for P17726 (Ornithodoros moubata)
Explore P17726 
Go to UniProtKB:  P17726
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17726
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 10 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other