1LXH

Solution structure of alpha-cobratoxin complexed with a cognate peptide (minimized average structure)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

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This is version 1.3 of the entry. See complete history


Literature

NMR-based Binding Screen and Structural Analysis of the Complex Formed between alpha-Cobratoxin and an 18-mer Cognate Peptide Derived from the alpha1 Subunit of the Nicotinic Acetylcholine Receptor from Torpedo californica

Zeng, H.Hawrot, E.

(2002) J Biol Chem 277: 37439-37445

  • DOI: 10.1074/jbc.M205483200
  • Primary Citation of Related Structures:  
    1LXG, 1LXH

  • PubMed Abstract: 
  • The alpha18-mer peptide, spanning residues 181-198 of the Torpedo nicotinic acetylcholine receptor alpha1 subunit, contains key binding determinants for agonists and competitive antagonists. To investigate whether the alpha18-mer can bind other alpha-neurotoxins besides alpha-bungarotoxin, we designed a two-dimensional (1)H-(15)N heteronuclear single quantum correlation experiment to screen four related neurotoxins for their binding ability to the peptide ...

    The alpha18-mer peptide, spanning residues 181-198 of the Torpedo nicotinic acetylcholine receptor alpha1 subunit, contains key binding determinants for agonists and competitive antagonists. To investigate whether the alpha18-mer can bind other alpha-neurotoxins besides alpha-bungarotoxin, we designed a two-dimensional (1)H-(15)N heteronuclear single quantum correlation experiment to screen four related neurotoxins for their binding ability to the peptide. Of the four toxins tested (erabutoxin a, erabutoxin b, LSIII, and alpha-cobratoxin), only alpha-cobratoxin binds the alpha18-mer to form a 1:1 complex. The NMR solution structure of the alpha-cobratoxin.alpha18-mer complex was determined with a backbone root mean square deviation of 1.46 A. In the structure, alpha-cobratoxin contacts the alpha18-mer at the tips of loop I and II and through C-terminal cationic residues. The contact zone derived from the intermolecular nuclear Overhauser effects is in agreement with recent biochemical data. Furthermore, the structural models support the involvement of cation-pi interactions in stabilizing the complex. In addition, the binding screen results suggest that C-terminal cationic residues of alpha-bungarotoxin and alpha-cobratoxin contribute significantly to binding of the alpha18-mer. Finally, we present a structural model for nicotinic acetylcholine receptor-alpha-cobratoxin interaction by superimposing the alpha-cobratoxin.alpha18-mer complex onto the crystal structure of the acetylcholine-binding protein (Protein Data Bank code ).


    Organizational Affiliation

    Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown Medical School, Providence, Rhode Island 02912, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LONG NEUROTOXIN 1A71Naja kaouthiaMutation(s): 0 
UniProt
Find proteins for P01391 (Naja kaouthia)
Explore P01391 
Go to UniProtKB:  P01391
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UniProt GroupP01391
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYLCHOLINE RECEPTOR PROTEIN, ALPHA CHAINB19Tetronarce californicaMutation(s): 0 
Gene Names: CHRNA1
UniProt
Find proteins for P02710 (Tetronarce californica)
Explore P02710 
Go to UniProtKB:  P02710
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UniProt GroupP02710
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HSL
Query on HSL
B L-PEPTIDE LINKINGC4 H7 N O2SER
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: 2002-11-20
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations