Macromolecule Content

• Total Structure Weight: 1412.70 
• Atom Count: 95 
• Residue Count: 14 
• Unique protein chains: 1

2EW4

Solution structure of MrIA

• DOI: 10.2210/pdb2EW4/pdb
• BMRB: 6891

• Classification: TOXIN
• Organism(s): Conus marmoreus


• Deposited: 2005-11-02 Released: 2005-11-15 
• Deposition Author(s): Nilsson, K.P., Lovelace, E.S., Caesar, C.E., Tynngard, N., Alewood, P.F., Johansson, H.M., Sharpe, I.A., Lewis, R.J., Daly, N.L., Craik, D.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

Solution structure of chi-conopeptide MrIA, a modulator of the human norepinephrine transporter

Nilsson, K.P., Lovelace, E.S., Caesar, C.E., Tynngard, N., Alewood, P.F., Johansson, H.M., Sharpe, I.A., Lewis, R.J., Daly, N.L., Craik, D.J.

(2005) Biopolymers 80: 815-823

• PubMed: 15931669 
• DOI: 10.1002/bip.20302


• PubMed Abstract: 
  

The chi-conopeptides MrIA and MrIB are 13-residue peptides with two disulfide bonds that inhibit human and rat norepinephrine transporter systems and are of significant interest for the design of novel drugs involved in pain treatment. In the current study we have determined the solution structure of MrIA using NMR spectroscopy. The major element of secondary structure is a beta-hairpin with the two strands connected by an inverse gamma-turn. The residues primarily involved in activity have previously been shown to be located in the turn region (Sharpe, I. A.; Palant, E.; Schroder, C. I.; Kaye, D. M.; Adams, D. J.; Alewood, P. F.; Lewis, R. J. J Biol Chem 2003, 278, 40317-40323), which appears to be more flexible than the beta-strands based on disorder in the ensemble of calculated structures. Analogues of MrIA with N-terminal truncations indicate that the N-terminal residues play a role in defining a stable conformation and the native disulfide connectivity. In particular, noncovalent interactions between Val3 and Hyp12 are likely to be involved in maintaining a stable conformation. The N-terminus also affects activity, as a single N-terminal deletion introduced additional pharmacology at rat vas deferens, while deleting the first two amino acids reduced chi-conopeptide potency.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
MrIA	A	14	Conus marmoreus	Mutation(s): 0
Find proteins for P58808 (Conus marmoreus) Go to UniProtKB:  P58808

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: 2EW4 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-11-02 
• Released Date: 2005-11-15 
• Deposition Author(s): Nilsson, K.P., Lovelace, E.S., Caesar, C.E., Tynngard, N., Alewood, P.F., Johansson, H.M., Sharpe, I.A., Lewis, R.J., Daly, N.L., Craik, D.J.

Revision History 

• Version 1.0: 2005-11-15
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance