Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3062.49 
• Atom Count: 208 
• Residue Count: 28 
• Unique protein chains: 1

1TR6

NMR solution structure of omega-conotoxin [K10]GVIA, a cyclic cysteine knot peptide

• DOI: 10.2210/pdb1TR6/pdb

• Classification: TOXIN
• Organism(s): Conus geographus
• Mutation(s): 1 


• Deposited: 2004-06-21 Released: 2004-07-13 
• Deposition Author(s): Mould, J., Yasuda, T., Schroeder, C.I., Beedle, A.M., Doering, C.J., Zamponi, G.W., Adams, D.J., Lewis, R.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

The alpha2delta auxiliary subunit reduces affinity of omega-conotoxins for recombinant N-type (Cav2.2) calcium channels

Mould, J., Yasuda, T., Schroeder, C.I., Beedle, A.M., Doering, C.J., Zamponi, G.W., Adams, D.J., Lewis, R.J.

(2004) J.Biol.Chem. 279: 34705-34714

• PubMed: 15166237 
• DOI: 10.1074/jbc.M310848200
• Primary Citation of Related Structures:  
  1TTL


• PubMed Abstract: 
  

The omega-conotoxins from fish-hunting cone snails are potent inhibitors of voltage-gated calcium channels. The omega-conotoxins MVIIA and CVID are selective N-type calcium channel inhibitors with potential in the treatment of chronic pain. The beta and alpha(2)delta-1 auxiliary subunits influence the expression and characteristics of the alpha(1B) subunit of N-type channels and are differentially regulated in disease states, including pain. In this study, we examined the influence of these auxiliary subunits on the ability of the omega-conotoxins GVIA, MVIIA, CVID and analogues to inhibit peripheral and central forms of the rat N-type channels. Although the beta3 subunit had little influence on the on- and off-rates of omega-conotoxins, coexpression of alpha(2)delta with alpha(1B) significantly reduced on-rates and equilibrium inhibition at both the central and peripheral isoforms of the N-type channels. The alpha(2)delta also enhanced the selectivity of MVIIA, but not CVID, for the central isoform. Similar but less pronounced trends were also observed for N-type channels expressed in human embryonic kidney cells. The influence of alpha(2)delta was not affected by oocyte deglycosylation. The extent of recovery from the omega-conotoxin block was least for GVIA, intermediate for MVIIA, and almost complete for CVID. Application of a hyperpolarizing holding potential (-120 mV) did not significantly enhance the extent of CVID recovery. Interestingly, [R10K]MVIIA and [O10K]GVIA had greater recovery from the block, whereas [K10R]CVID had reduced recovery from the block, indicating that position 10 had an important influence on the extent of omega-conotoxin reversibility. Recovery from CVID block was reduced in the presence of alpha(2)delta in human embryonic kidney cells and in oocytes expressing alpha(1B-b). These results may have implications for the antinociceptive properties of omega-conotoxins, given that the alpha(2)delta subunit is up-regulated in certain pain states.

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Organizational Affiliation: 

Institute for Molecular Bioscience, University of Queensland, Queensland 4072, Australia.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Omega-conotoxin GVIA	A	28	Conus geographus	Mutation(s): 1
Find proteins for P01522 (Conus geographus) Go to UniProtKB:  P01522

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NH2	A	NON-POLYMER	H2 N		--
HYP	A	L-PEPTIDE LINKING	C5 H9 N O3		PRO

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• Olderado: 1TR6 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-06-21 
• Released Date: 2004-07-13 
• Deposition Author(s): Mould, J., Yasuda, T., Schroeder, C.I., Beedle, A.M., Doering, C.J., Zamponi, G.W., Adams, D.J., Lewis, R.J.

Revision History 

• Version 1.0: 2004-07-13
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2011-10-05
  Type: Derived calculations