Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 2.34 kDa 
• Atom Count: 162 
• Modelled Residue Count: 21 
• Deposited Residue Count: 21 
• Unique protein chains: 1

1JZP

Modified Peptide A (D18-A1) of the Rabbit Skeletal Dihydropyridine Receptor

• PDB DOI: 10.2210/pdb1JZP/pdb
• BMRB: 5196

• Classification: SIGNALING PROTEIN
• Mutation(s): No 


• Deposited: 2001-09-17 Released: 2002-03-20 
• Deposition Author(s): Green, D., Pace, S., Sakowska, M., Dulhunty, A.F., Casarotto, M.G.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 17 
• Conformers Submitted: 1 

Literature

The three-dimensional structural surface of two beta-sheet scorpion toxins mimics that of an alpha-helical dihydropyridine receptor segment.

Green, D., Pace, S., Curtis, S.M., Sakowska, M., Lamb, G.D., Dulhunty, A.F., Casarotto, M.G.

(2003) Biochem J 370: 517-527

• PubMed: 12429019 
• DOI: 10.1042/BJ20021488
• Primary Citation of Related Structures:  
  1JZP


• PubMed Abstract: 
  

An alpha-helical II-III loop segment of the dihydropyridine receptor activates the ryanodine receptor calcium-release channel. We describe a novel manipulation in which this agonist's activity is increased by modifying its surface structure to resemble that of a toxin molecule. In a unique system, native beta-sheet scorpion toxins have been reported to activate skeletal muscle ryanodine receptor calcium channels with high affinity by binding to the same site as the lower-affinity alpha-helical dihydropyridine receptor segment. We increased the alignment of basic residues in the alpha-helical peptide to mimic the spatial orientation of active residues in the scorpion toxin, with a consequent 2-20-fold increase in the activity of the alpha-helical peptide. We hypothesized that, like the native peptide, the modified peptide and the scorpion toxin may bind to a common site. This was supported by (i) similar changes in ryanodine receptor channel gating induced by the native or modified alpha-helical peptide and the beta-sheet toxin, a 10-100-fold reduction in channel closed time, with a < or = 2-fold increase in open dwell time and (ii) a failure of the toxin to further activate channels activated by the peptides. These results suggest that diverse structural scaffolds can present similar conformational surface properties to target common receptor sites.

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Organizational Affiliation: 

Division of Molecular Bioscience, John Curtin School of Medical Research, Australian National University, P.O. Box 334, Canberra, ACT, 2601, Australia.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Skeletal Dihydropydrine Receptor	A	21	N/A	Mutation(s): 0
UniProt
Find proteins for P07293 (Oryctolagus cuniculus) Explore P07293  Go to UniProtKB:  P07293

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 17 
• Conformers Submitted: 1 
• OLDERADO: 1JZP Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-09-17 
• Released Date: 2002-03-20 
Deposition Author(s): Green, D., Pace, S., Sakowska, M., Dulhunty, A.F., Casarotto, M.G.

Revision History  

• Version 1.0: 2002-03-20
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-23
  Changes: Database references, Derived calculations