1MVI

N-TYPE CALCIUM CHANNEL BLOCKER, OMEGA-CONOTOXIN MVIIA, NMR, 15 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 15 
  • Selection Criteria: LOW E AND FEW VIOLATIONS OF EXPERIMENTAL RESTRAINTS 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

A consensus structure for omega-conotoxins with different selectivities for voltage-sensitive calcium channel subtypes: comparison of MVIIA, SVIB and SNX-202.

Nielsen, K.J.Thomas, L.Lewis, R.J.Alewood, P.F.Craik, D.J.

(1996) J.Mol.Biol. 263: 297-310

  • DOI: 10.1006/jmbi.1996.0576
  • Primary Citation of Related Structures:  1MVJ

  • PubMed Abstract: 
  • The omega-conotoxins are a set of structurally related peptides that have a wide range of specificities for different subtypes of the voltage-sensitive calcium channel (VSCC). To understand their VSCC subtype differentiation we studied the structure ...

    The omega-conotoxins are a set of structurally related peptides that have a wide range of specificities for different subtypes of the voltage-sensitive calcium channel (VSCC). To understand their VSCC subtype differentiation we studied the structure of two naturally occurring omega-conotoxins, MVIIA (specific to N-type) and SVIB (specific to P/Q-type) and a synthetic hybrid, SNX-202, which has altered specificities to both VSCC subtypes. The secondary structures of the three peptides are almost identical, consisting of a triple-stranded beta-sheet and several turns. A comparison of NMR data emphasizes the structural similarities between the peptides and highlights some minor structural differences. In the three-dimensional structures of SVIB and MVIIA these are manifested as orientational differences between two key loops. The structural rigidity of MVIIA was also examined. H alpha shifts are similar in a range of solvents, indicating that there are no solvent-induced changes in structure. The omega-conotoxins form a consensus structure despite differences in sequence and VSCC subtype specificity. This indicates that the omega-conotoxin macrosites for the N/P/Q-subfamily of VSCCs are related, with specificity for receptor targets being conferred by the positions of functional side-chains on the surface of the peptides.


    Organizational Affiliation

    Centre for Drug Design and Development, University of Queensland, Brisbane, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MVIIA
A
26Conus magusN/A
Find proteins for P05484 (Conus magus)
Go to UniProtKB:  P05484
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 Calculated: 50 
  • Conformers Submitted: 15 
  • Selection Criteria: LOW E AND FEW VIOLATIONS OF EXPERIMENTAL RESTRAINTS 
  • Olderado: 1MVI 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: 1997-08-12
    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