6EFE

NMR Solution Structure of vil14a

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

  • Deposited: 2018-08-16 Released: 2018-09-05 
  • Deposition Author(s): Dovell, S., Mari, F., Moller, C., Melaun, C.
  • Funding Organization(s): National Institutes of Health/National Center for Research Resources (NIH/NCRR), Other government

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 18 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Definition of the R-superfamily of conotoxins: Structural convergence of helix-loop-helix peptidic scaffolds.

Moller, C.Dovell, S.Melaun, C.Mari, F.

(2018) Peptides 107: 75-82

  • DOI: 10.1016/j.peptides.2018.06.002
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The F14 conotoxins define a four-cysteine, three-loop conotoxin scaffold that produce tightly folded structures held together by two disulfide bonds with a CCCC arrangement (conotoxin framework 14). Here we describe the precursors of the F14 conotoxins from the venom of Conus anabathrum and Conus villepinii ...

    The F14 conotoxins define a four-cysteine, three-loop conotoxin scaffold that produce tightly folded structures held together by two disulfide bonds with a CCCC arrangement (conotoxin framework 14). Here we describe the precursors of the F14 conotoxins from the venom of Conus anabathrum and Conus villepinii. Using transcriptomic and cDNA cloning analysis, the full-length of the precursors of flf14a and flf14b from the transcriptome of C. anabathrum revealed a unique signal sequence that defines the new conotoxin R-superfamily. Using the signal sequence as a primer, we cloned seven additional previously undescribed toxins of the R-superfamily from C. villepinii. The propeptide regions of the R-conotoxins are unusually long and with prevalent proline residues in repeating pentads which qualifies them as Pro-rich motifs (PRMs), which can be critical for protein-protein interactions or they can be cleaved to release short linear peptides that may be part of the envenomation mélange. Additionally, we determined the three-dimensional structure of vil14a by solution 1 H-NMR and found that the structure of this conotoxin displays a cysteine-stabilized α-helix-loop-helix (C s α/α) fold. The structure is well-defined over the helical regions (backbone RMSD for residues 2-13 and 17-26 is 0.63 ± 0.14 Å), with conformational flexibility in the triple Gly region of the second loop as well as the N- and C- termini. Structurally, the F14 conotoxins overlap with the C s α/α scorpion toxins and other peptidic natural products, and in spite of their different exogenomic origins, there is convergence into this scaffold from several classes of living organisms that express these peptides.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431-0991, USA; Marine Biochemical Sciences, Chemical Sciences Division, National Institute of Standards and Technology, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, USA. Electronic address: frank.mari@nist.gov.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kappa-conotoxin vil14aA27Conus villepiniiMutation(s): 0 
Find proteins for P84704 (Conus villepinii)
Explore P84704 
Go to UniProtKB:  P84704
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 18 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 6EFE Olderado

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesGM 066004
Other governmentUnited StatesR/LR-MB-28

Revision History 

  • Version 1.0: 2018-09-05
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Author supporting evidence