1WCT

A NOVEL CONOTOXIN FROM CONUS TEXTILE WITH UNUSUAL POST-TRANSLATIONAL MODIFICATIONS REDUCES PRESYNAPTIC CALCIUM INFLUX, NMR, 1 STRUCTURE, GLYCOSYLATED PROTEIN


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 
  • Selection Criteria: LOWEST ENERGY 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

A conotoxin from Conus textile with unusual posttranslational modifications reduces presynaptic Ca2+ influx.

Rigby, A.C.Lucas-Meunier, E.Kalume, D.E.Czerwiec, E.Hambe, B.Dahlqvist, I.Fossier, P.Baux, G.Roepstorff, P.Baleja, J.D.Furie, B.C.Furie, B.Stenflo, J.

(1999) Proc Natl Acad Sci U S A 96: 5758-5763

  • DOI: 10.1073/pnas.96.10.5758
  • Primary Citation of Related Structures:  
    1WCT

  • PubMed Abstract: 
  • Cone snails are gastropod mollusks of the genus Conus that live in tropical marine habitats. They are predators that paralyze their prey by injection of venom containing a plethora of small, conformationally constrained peptides (conotoxins). We report the identification, characterization, and structure of a gamma-carboxyglutamic acid-containing peptide, conotoxin epsilon-TxIX, isolated from the venom of the molluscivorous cone snail, Conus textile ...

    Cone snails are gastropod mollusks of the genus Conus that live in tropical marine habitats. They are predators that paralyze their prey by injection of venom containing a plethora of small, conformationally constrained peptides (conotoxins). We report the identification, characterization, and structure of a gamma-carboxyglutamic acid-containing peptide, conotoxin epsilon-TxIX, isolated from the venom of the molluscivorous cone snail, Conus textile. The disulfide bonding pattern of the four cysteine residues, an unparalleled degree of posttranslational processing including bromination, hydroxylation, and glycosylation define a family of conotoxins that may target presynaptic Ca2+ channels or act on G protein-coupled presynaptic receptors via another mechanism. This conotoxin selectively reduces neurotransmitter release at an Aplysia cholinergic synapse by reducing the presynaptic influx of Ca2+ in a slow and reversible fashion. The three-dimensional structure, determined by two-dimensional 1H NMR spectroscopy, identifies an electronegative patch created by the side chains of two gamma-carboxyglutamic acid residues that extend outward from a cavernous cleft. The glycosylated threonine and hydroxylated proline enclose a localized hydrophobic region centered on the brominated tryptophan residue within the constrained intercysteine region.


    Organizational Affiliation

    Marine Biological Laboratory, Woods Hole, MA 02543, USA.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OMEGAC-TXIXA13Conus textileMutation(s): 0 
UniProt
Find proteins for P81755 (Conus textile)
Explore P81755 
Go to UniProtKB:  P81755
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-galactopyranoseB2O-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G01534TU
GlyCosmos:  G01534TU
GlyGen:  G01534TU
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
BTR
Query on BTR
AL-PEPTIDE LINKINGC11 H11 Br N2 O2TRP
CGU
Query on CGU
AL-PEPTIDE LINKINGC6 H9 N O6GLU
HYP
Query on HYP
AL-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 
  • Selection Criteria: LOWEST ENERGY 
  • OLDERADO: 1WCT Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-06-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Advisory, Derived calculations, Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Polymer sequence, Structure summary