2JQC

A L-amino acid mutant of a D-amino acid containing conopeptide


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Purification and structural characterization of a d-amino acid-containing conopeptide, conomarphin, from Conus marmoreus

Han, Y.Huang, F.Jiang, H.Liu, L.Wang, Q.Wang, Y.Shao, X.Chi, C.Du, W.Wang, C.

(2008) Febs J. 275: 1976-1987

  • DOI: 10.1111/j.1742-4658.2008.06352.x
  • Primary Citation of Related Structures:  2YYF

  • PubMed Abstract: 
  • Cone snails, a group of gastropod animals that inhabit tropical seas, are capable of producing a mixture of peptide neurotoxins, namely conotoxins, for defense and predation. Conotoxins are mainly disulfide-rich short peptides that act on different i ...

    Cone snails, a group of gastropod animals that inhabit tropical seas, are capable of producing a mixture of peptide neurotoxins, namely conotoxins, for defense and predation. Conotoxins are mainly disulfide-rich short peptides that act on different ion channels, neurotransmitter receptors, or transporters in the nervous system. They exhibit highly diverse compositions, structures, and biological functions. In this work, a novel Cys-free 15-residue conopeptide from Conus marmoreus was purified and designated as conomarphin. Conomarphin is unique because of its D-configuration Phe at the third residue from the C-terminus, which was identified using HPLC by comparing native conomarphin fragments and the corresponding synthetic peptides cleaved by different proteases. Surprisingly, the cDNA-encoded precursor of conomarphin was found to share the conserved signal peptide with other M-superfamily conotoxins, clearly indicating that conomarphin should belong to the M-superfamily, although conomarphin shares no homology with other six-Cys-containing M-superfamily conotoxins. Furthermore, NMR spectroscopy experiments established that conomarphin adopts a well-defined structure in solution, with a tight loop in the middle of the peptide and a short 3(10)-helix at the C-terminus. By contrast, no loop in L-Phe13-conomarphin was found, which suggests that D-Phe13 is essential for the structure of conomarphin. In conclusion, conomarphin may represent a new conotoxin family, whose biological activity remains to be identified.


    Organizational Affiliation

    Institute of Protein Research, Tongji University, Shanghai, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
L-mr12
A
15Conus marmoreusN/A
Find proteins for B2KPN7 (Conus marmoreus)
Go to UniProtKB:  B2KPN7
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HYP
Query on HYP
A
L-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 
  • Olderado: 2JQC Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance