Macromolecule Content

• Total Structure Weight: 10353.91 
• Atom Count: 708 
• Residue Count: 94 
• Unique protein chains: 2

1KL8

NMR STRUCTURAL ANALYSIS OF THE COMPLEX FORMED BETWEEN ALPHA-BUNGAROTOXIN AND THE PRINCIPAL ALPHA-NEUROTOXIN BINDING SEQUENCE ON THE ALPHA7 SUBUNIT OF A NEURONAL NICOTINIC ACETYLCHOLINE RECEPTOR

• DOI: 10.2210/pdb1KL8/pdb
• BMRB: 5024

• Classification: TOXIN
• Organism(s): Gallus gallus, Bungarus multicinctus
• Expression System: Escherichia coli


• Deposited: 2001-12-11 Released: 2002-03-13 
• Deposition Author(s): Moise, L., Piserchio, A., Basus, V.J., Hawrot, E.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Literature

NMR structural analysis of alpha-bungarotoxin and its complex with the principal alpha-neurotoxin-binding sequence on the alpha 7 subunit of a neuronal nicotinic acetylcholine receptor.

Moise, L., Piserchio, A., Basus, V.J., Hawrot, E.

(2002) J.Biol.Chem. 277: 12406-12417

• PubMed: 11790782 
• DOI: 10.1074/jbc.M110320200
• Primary Citation of Related Structures:  
  1KFH, 1KC4


• PubMed Abstract: 
  

We report a new, higher resolution NMR structure of alpha-bungarotoxin that defines the structure-determining disulfide core and beta-sheet regions. We further report the NMR structure of the stoichiometric complex formed between alpha-bungarotoxin and a recombinantly expressed 19-mer peptide ((178)IPGKRTESFYECCKEPYPD(196)) derived from the alpha7 subunit of the chick neuronal nicotinic acetylcholine receptor. A comparison of these two structures reveals binding-induced stabilization of the flexible tip of finger II in alpha-bungarotoxin. The conformational rearrangements in the toxin create an extensive binding surface involving both sides of the alpha7 19-mer hairpin-like structure. At the contact zone, Ala(7), Ser(9), and Ile(11) in finger I and Arg(36), Lys(38), Val(39), and Val(40) in finger II of alpha-bungarotoxin interface with Phe(186), Tyr(187), Glu(188), and Tyr(194) in the alpha7 19-mer underscoring the importance of receptor aromatic residues as critical neurotoxin-binding determinants. Superimposing the structure of the complex onto that of the acetylcholine-binding protein (1I9B), a soluble homologue of the extracellular domain of the alpha7 receptor, places alpha-bungarotoxin at the peripheral surface of the inter-subunit interface occluding the agonist-binding site. The disulfide-rich core of alpha-bungarotoxin is suggested to be tilted in the direction of the membrane surface with finger II extending into the proposed ligand-binding cavity.

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Related Citations: 

• Chimeric Analysis of a Neuronal Nicotinic Acetylcholine Receptor Reveals Amino Acids Conferring Sensitivity to Alpha-Bungarotoxin.
  Levandoski, M.M.,Lin, Y.,Moise, L.,Mclaughlin, J.T.,Cooper, E.,Hawrot, E.
  (1999) J.Biol.Chem. 274: 26113
• Structural Studies of Alpha-Bungarotoxin. 1. Sequence-Specific 1H NMR Resonance Assignments.
  Basus, V.J.,Billeter, M.,Love, R.A.,Stroud, R.M.,Kuntz, I.D.
  (1988) Biochemistry 27: 2763
• Identification of Sequence Segments Forming the Alpha-Bungarotoxin Binding Sites on Two Nicotinic Acetylcholine Receptor Alpha Subunits from the Avian Brain.
  Mclane, K.E.,Wu, X.D.,Schoepfer, R.,Lindstrom, J.M.,Conti-Tronconi, B.M.
  (1991) J.Biol.Chem. 266: 15230




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Organizational Affiliation: 

Department of Molecular Pharmacology, Brown University, Providence, Rhode Island 02912, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ALPHA-BUNGAROTOXIN	A	74	Bungarus multicinctus	Mutation(s): 0
Find proteins for P60615 (Bungarus multicinctus) Go to UniProtKB:  P60615

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
NEURONAL ACETYLCHOLINE RECEPTOR PROTEIN, ALPHA-7 CHAIN	B	20	Gallus gallus	Mutation(s): 1  Gene Names: CHRNA7
Find proteins for P22770 (Gallus gallus) Go to Gene View: CHRNA7 Go to UniProtKB:  P22770

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
HSL	B	L-PEPTIDE LINKING	C4 H7 N O2		SER

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-12-11 
• Released Date: 2002-03-13 
• Deposition Author(s): Moise, L., Piserchio, A., Basus, V.J., Hawrot, E.

Revision History 

• Version 1.0: 2002-03-13
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance