1NEA

THREE-DIMENSIONAL SOLUTION STRUCTURE OF A CURAREMIMETIC TOXIN FROM NAJA NIGRICOLLIS VENOM: A PROTON NMR AND MOLECULAR MODELING STUDY


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Three-dimensional solution structure of a curaremimetic toxin from Naja nigricollis venom: a proton NMR and molecular modeling study.

Zinn-Justin, S.Roumestand, C.Gilquin, B.Bontems, F.Menez, A.Toma, F.

(1992) Biochemistry 31: 11335-11347

  • DOI: 10.1021/bi00161a011
  • Primary Citation of Related Structures:  
    1NEA

  • PubMed Abstract: 
  • The solution conformation of toxin alpha from Naja nigricollis (61 amino acids and four disulfides), a snake toxin which specifically blocks the activity of the nicotinic acetylcholine receptor (AcChoR), has been determined using nuclear magnetic resonance spectroscopy and molecular modeling ...

    The solution conformation of toxin alpha from Naja nigricollis (61 amino acids and four disulfides), a snake toxin which specifically blocks the activity of the nicotinic acetylcholine receptor (AcChoR), has been determined using nuclear magnetic resonance spectroscopy and molecular modeling. The solution structures were calculated using 409 distance and 73 dihedral angle restraints. The average atomic rms deviation between the eight refined structures and the mean structure is approximately 0.5 A for the backbone atoms. The overall folding of toxin alpha consists of three major loops which are stabilized by three disulfide bridges and one short C terminal loop stabilized by a fourth disulfide bridge. All the disulfides are grouped in the same region of the molecule, forming a highly constrained structure from which the loops protrude. As predicted, this structure appears to be very similar to the 1.4-A resolution crystal structure of another snake neurotoxin, namely, erabutoxin b from Laticauda semifasciata. The atomic rms deviation for the backbone atoms between the solution and crystal structures is approximately 1.7 A. The minor differences which are observed between the two structures are partly related to the deletion of one residue from the chain of toxin alpha. It is notable that, although the two toxins differ from each other by 16 amino acid substitutions, their side chains have an essentially similar spatial organization. However, most of the side chains which constitute the presumed AcChoR binding site for the curaremimetic toxins are poorly resolved in toxin alpha.(ABSTRACT TRUNCATED AT 250 WORDS)


    Organizational Affiliation

    Laboratoire de Structure des Protéines en Solution, Département d'Ingénierie et d'Etude des Protéines, Gif-sur-Yvette, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TOXIN ALPHAA61Naja nigricollisMutation(s): 0 
UniProt
Find proteins for P01426 (Naja pallida)
Explore P01426 
Go to UniProtKB:  P01426
Entity Groups  
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UniProt GroupP01426
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-10-31
    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