Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 19 
  • Selection Criteria: TOTAL NOE CONSTRAINT VIOLATIONS < 1.0 A 

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This is version 1.3 of the entry. See complete history


High-resolution solution structure of human pNR-2/pS2: a single trefoil motif protein.

Polshakov, V.I.Williams, M.A.Gargaro, A.R.Frenkiel, T.A.Westley, B.R.Chadwick, M.P.May, F.E.Feeney, J.

(1997) J Mol Biol 267: 418-432

  • DOI: https://doi.org/10.1006/jmbi.1997.0896
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    pNR-2/pS2 is a 60 residue extracellular protein, which was originally discovered in human breast cancer cells, and subsequently found in other tumours and normal gastric epithelial cells. We have determined the three-dimensional solution structure of a C58S mutant of human pNR-2/pS2 using 639 distance and 137 torsion angle constraints obtained from analysis of multidimensional NMR spectra. A series of simulated annealing calculations resulted in the unambiguous determination of the protein's disulphide bonding pattern and produced a family of 19 structures consistent with the constraints. The peptide contains a single "trefoil" sequence motif, a region of about 40 residues with a characteristic sequence pattern, which has been found, either singly or as a repeat, in about a dozen extracellular proteins. The trefoil domain contains three disulphide bonds, whose 1-5, 2-4 and 3-6 cysteine pairings form the structure into three closely packed loops with only a small amount of secondary structure, which consists of a short alpha-helix packed against a two-stranded antiparallel beta-sheet. The structure of the domain is very similar to those of the two trefoil domains that occur in porcine spasmolytic polypeptide (PSP), the only member of the trefoil family whose three-dimensional structure has been previously determined. Outside the trefoil domain, which forms the compact "head" of the molecule, the N and C-terminal strands are closely associated, forming an extended "tail", which has some beta-sheet character for part of its length and which becomes more disordered towards the termini as indicated by (15)N{(1)H} NOEs. We have considered the structural implications of the possible formation of a native C58-C58 disulphide-bonded homodimer. Comparison of the surface features of pNR-2/pS2 and PSP, and consideration of the sequences of the other human trefoil domains in the light of these structures, illuminates the possible role of specific residues in ligand/receptor binding.

  • Organizational Affiliation

    Laboratory of Physical Methods, Chemical-Pharmaceutical Research Institute, Moscow, Russia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PS260Homo sapiensMutation(s): 1 
Gene Names: BCEI
UniProt & NIH Common Fund Data Resources
Find proteins for P04155 (Homo sapiens)
Explore P04155 
Go to UniProtKB:  P04155
PHAROS:  P04155
GTEx:  ENSG00000160182 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04155
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 19 
  • Selection Criteria: TOTAL NOE CONSTRAINT VIOLATIONS < 1.0 A 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-07-07
    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: 2021-11-03
    Changes: Database references, Derived calculations, Other