1IEO

SOLUTION STRUCTURE OF MRIB-NH2

• PDB DOI: https://doi.org/10.2210/pdb1IEO/pdb

• Classification: TOXIN
• Organism(s): Conus marmoreus
• Mutation(s): No 


• Deposited: 2001-04-10 Released: 2002-04-03 
• Deposition Author(s): Sharpe, I.A., Gehrmann, J., Loughnan, M.L., Thomas, L., Adams, D.A., Atkins, A., Palant, E., Craik, D.J., Adams, D.J., Alewood, P.F., Lewis, R.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: The submitted conformer models are the 20 structures with the lowest energy. 

Literature

Two new classes of conopeptides inhibit the alpha1-adrenoceptor and noradrenaline transporter.

Sharpe, I.A., Gehrmann, J., Loughnan, M.L., Thomas, L., Adams, D.A., Atkins, A., Palant, E., Craik, D.J., Adams, D.J., Alewood, P.F., Lewis, R.J.

(2001) Nat Neurosci 4: 902-907

• PubMed: 11528421 
• DOI: https://doi.org/10.1038/nn0901-902
• Primary Citation of Related Structures:  
  1IEN, 1IEO


• PubMed Abstract: 
  

  Cone snails use venom containing a cocktail of peptides ('conopeptides') to capture their prey. Many of these peptides also target mammalian receptors, often with exquisite selectivity. Here we report the discovery of two new classes of conopeptides. One class targets alpha1-adrenoceptors (rho-TIA from the fish-hunting Conus tulipa), and the second class targets the neuronal noradrenaline transporter (chi-MrIA and chi-MrIB from the mollusk-hunting C. marmoreus). rho-TIA and chi-MrIA selectively modulate these important membrane-bound proteins. Both peptides act as reversible non-competitive inhibitors and provide alternative avenues for the identification of inhibitor drugs.

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Organizational Affiliation: 

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

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1.4 kDa 
• Atom Count: 94 
• Modelled Residue Count: 14 
• Deposited Residue Count: 14 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN MRIB-NH2	A	14	N/A	Mutation(s): 0
UniProt
Find proteins for P58810 (Conus marmoreus) Explore P58810  Go to UniProtKB:  P58810

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
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: The submitted conformer models are the 20 structures with the lowest energy. 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-04-03 
Deposition Author(s): Sharpe, I.A., Gehrmann, J., Loughnan, M.L., Thomas, L., Adams, D.A., Atkins, A., Palant, E., Craik, D.J., Adams, D.J., Alewood, P.F., Lewis, R.J.

Revision History  

• Version 1.0: 2002-04-03
  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: Data collection, Database references, Derived calculations