1SHI

REFINED STRUCTURE IN SOLUTION OF THE SEA ANEMONE NEUROTOXIN SHI


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Refined structure in solution of the sea anemone neurotoxin ShI.

Wilcox, G.R.Fogh, R.H.Norton, R.S.

(1993) J.Biol.Chem. 268: 24707-24719


  • PubMed Abstract: 
  • A high resolution structure in solution has been determined for the polypeptide neurotoxin I, from the sea anemone Stichodactyla helianthus, using NMR data, distance geometry calculations, and refinement by back-calculation of two-dimensional nuclear ...

    A high resolution structure in solution has been determined for the polypeptide neurotoxin I, from the sea anemone Stichodactyla helianthus, using NMR data, distance geometry calculations, and refinement by back-calculation of two-dimensional nuclear Overhauser enhancement (NOE) spectra. A set of 913 distance constraints derived from NOEs was used, together with a large set of lower distance bounds based on the absence of NOEs in the spectrum. Eight published structures for neurotoxin I were refined independently to give structures which agree better with the experimental data, as reflected in reduced R factors calculated over well resolved cross-peaks of the two-dimensional NOE spectra and a lower total volume of peaks in back-calculated spectra that are absent from experimental spectra. The refined structures are also more precisely defined, with mean pairwise root mean square differences over backbone heavy atoms of 0.62 A for well defined residues and 1.14 A for all residues, compared with previous values of 1.09 and 2.41 A, respectively. The consensus constraint set from the 8 refined structures was also used to generate 12 new structures, with corresponding root mean square differences of 0.76 and 1.26 A. In all 20 structures the loop linking the first and second strands of the beta-sheet is considerably better defined than before. A type I beta-turn encompassing the functionally important residues Asp6, Asp7, and Glu8 is evident in the refined structures.


    Related Citations: 
    • Three-Dimensional Structure in Solution of Neurotoxin III from the Sea Anemone Anemonia Sulcata
      Manoleras, N.,Norton, R.S.
      (1994) Biochemistry 33: 11051
    • Structure and Structure-Function Relationships of Sea Anemone Proteins that Interact with the Sodium Channel
      Norton, R.S.
      (1991) Toxicon 29: 1051
    • Solution Structure of Neurotoxin I from the Sea Anemone Stichodactyla Helianthus. A Nuclear Magnetic Resonance, Distance Geometry, and Restrained Molecular Dynamics Study
      Fogh, R.H.,Kem, W.R.,Norton, R.S.
      (1990) J.Biol.Chem. 265: 13016


    Organizational Affiliation

    School of Biochemistry and Molecular Genetics, University of New South Wales, Kensington, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NEUROTOXIN I
A
49Stichodactyla helianthusMutation(s): 0 
Find proteins for P19651 (Stichodactyla helianthus)
Go to UniProtKB:  P19651
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
  • Olderado: 1SHI Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-02-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other