2LI3

Structural and functional analysis of a novel potassium toxin argentinean scorpion Tityus trivittatus reveals a new kappa sub-family


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST TARGET FUNCTION 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

New Tricks of an Old Pattern: STRUCTURAL VERSATILITY OF SCORPION TOXINS WITH COMMON CYSTEINE SPACING.

Saucedo, A.L.Flores-Solis, D.Rodriguez de la Vega, R.C.Ramirez-Cordero, B.Hernandez-Lopez, R.Cano-Sanchez, P.Navarro, R.N.Garcia-Valdes, J.Coronas-Valderrama, F.de Roodt, A.Brieba, L.G.Possani, L.D.Del Rio-Portilla, F.

(2012) J Biol Chem 287: 12321-12330

  • DOI: 10.1074/jbc.M111.329607
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Scorpion venoms are a rich source of K(+) channel-blocking peptides. For the most part, they are structurally related small disulfide-rich proteins containing a conserved pattern of six cysteines that is assumed to dictate their common three-dimensio ...

    Scorpion venoms are a rich source of K(+) channel-blocking peptides. For the most part, they are structurally related small disulfide-rich proteins containing a conserved pattern of six cysteines that is assumed to dictate their common three-dimensional folding. In the conventional pattern, two disulfide bridges connect an α-helical segment to the C-terminal strand of a double- or triple-stranded β-sheet, conforming a cystine-stabilized α/β scaffold (CSα/β). Here we show that two K(+) channel-blocking peptides from Tityus scorpions conserve the cysteine spacing of common scorpion venom peptides but display an unconventional disulfide pattern, accompanied by a complete rearrangement of the secondary structure topology into a CS helix-loop-helix fold. Sequence and structural comparisons of the peptides adopting this novel fold suggest that it would be a new elaboration of the widespread CSα/β scaffold, thus revealing an unexpected structural versatility of these small disulfide-rich proteins. Acknowledgment of such versatility is important to understand how venom structural complexity emerged on a limited number of molecular scaffolds.


    Organizational Affiliation

    Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, México, D.F., 04510, México.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium channel toxin kappa-KTX3.1A30Tityus trivittatusMutation(s): 0 
Find proteins for B3A0L5 (Tityus trivittatus)
Explore B3A0L5 
Go to UniProtKB:  B3A0L5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST TARGET FUNCTION 
  • OLDERADO: 2LI3 Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-01-11
    Type: Initial release
  • Version 1.1: 2012-04-25
    Changes: Database references