1SHP

THE NMR SOLUTION STRUCTURE OF A KUNITZ-TYPE PROTEINASE INHIBITOR FROM THE SEA ANEMONE STICHODACTYLA HELIANTHUS


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 

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This is version 1.2 of the entry. See complete history


Literature

The NMR solution structure of a Kunitz-type proteinase inhibitor from the sea anemone Stichodactyla helianthus.

Antuch, W.Berndt, K.D.Chavez, M.A.Delfin, J.Wuthrich, K.

(1993) Eur J Biochem 212: 675-684

  • DOI: 10.1111/j.1432-1033.1993.tb17705.x
  • Primary Citation of Related Structures:  
    1SHP

  • PubMed Abstract: 
  • The solution structure of a 55-amino-acid Kunitz-type proteinase inhibitor, ShPI, purified from the Caribbean sea anemone Stichodactyla helianthus, was determined by NMR spectroscopy. Nearly complete sequence-specific 1H-NMR assignments were obtained ...

    The solution structure of a 55-amino-acid Kunitz-type proteinase inhibitor, ShPI, purified from the Caribbean sea anemone Stichodactyla helianthus, was determined by NMR spectroscopy. Nearly complete sequence-specific 1H-NMR assignments were obtained at pH 4.6 and 36 degrees C, and stereo-specific assignments were determined for 23 pairs of diastereotopic substituents. A data set of 666 upper distance limit constraints and 122 dihedral angle constraints collected on this basis was used as input for a structure calculation with the program DIANA. Following energy minimization with the program OPAL, the average root-mean-square diviation (RMSD) of the 20 DIANA conformers used to represent the solution structure relative to the mean structure is 61 pm for all backbone atoms N, C alpha and C', and 106 pm for all heavy atoms of residues 2-53. This high-quality solution structure of ShPI has a nearly identical molecular architecture as the bovine pancreatic trypsin inhibitor (BPTI), despite a mere 35% of sequence similarity between the two proteins. Exchange rates measured for 48 out of the 51 backbone amide protons showed that the positions of 20 slowly exchanging amide protons correlate well with hydrogen bonds involving these protons in the energy-minimized solution structure. The solution structure of ShPI is compared to the four homologous proteins for which the three-dimensional structure is also available.


    Related Citations: 
    • Amino Acid Sequence and Three-Dimensional Model of a Serine Proteinase Inhibitor from Stichodactyla Helianthus
      Antuch, W., Dominguez, R., Rodriguez, R., Delfin, J., Morera, V., Diaz, J., Chavez, M., Dideberg, O., Padron, G.
      () To be published --: --

    Organizational Affiliation

    Institut für Molekularbiologie and Biophysik, Eidgenössische Technische Hochschule-Hönggerberg, Zürich, Switzerland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSIN INHIBITORA55Stichodactyla helianthusMutation(s): 0 
Find proteins for P31713 (Stichodactyla helianthus)
Explore P31713 
Go to UniProtKB:  P31713
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
  • OLDERADO: 1SHP Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance