2KY3

Solution structure of GS-alfa-Ktx5.4 synthetic scorpion like


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 17 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Cytotoxicity of recombinant tamapin and related toxin-like peptides on model cell lines.

Ramirez-Cordero, B.Toledano, Y.Cano-Sanchez, P.Hernandez-Lopez, R.Flores-Solis, D.Saucedo-Yanez, A.L.Chavez-Uribe, I.Brieba, L.G.Del Rio-Portilla, F.

(2014) Chem.Res.Toxicol. 27: 960-967

  • DOI: 10.1021/tx4004193
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The scorpion toxin tamapin displays the most potent and selective blockage against KCa2.2 channels known to date. In this work, we report the biosynthesis, three-dimensional structure, and cytotoxicity on cancer cell lines (Jurkat E6-1 and human mamm ...

    The scorpion toxin tamapin displays the most potent and selective blockage against KCa2.2 channels known to date. In this work, we report the biosynthesis, three-dimensional structure, and cytotoxicity on cancer cell lines (Jurkat E6-1 and human mammary breast cancer MDA-MB-231) of recombinant tamapin and five related peptides bearing mutations on residues (R6A,R7A, R13A, R6A-R7A, and GS-tamapin) that were previously suggested to be important for tamapin's activity. The indicated cell lines were used as they constitutively express KCa2.2 channels. The studied toxin-like peptides displayed lethal responses on Jurkat T cells and breast cancer cells; their effect is dose- and time-dependent with IC50 values in the nanomolar range. The order of potency is r-tamapin>GS-tamapin>R6A>R13A>R6A-R7A>R7A for Jurkat T cells and r-tamapin>R7A for MDA-MB-231 breast cancer cells. Our structural determination by NMR demonstrated that r-tamapin preserves the folding of the αKTx5 subfamily and that neither single nor double alanine mutations affect the three-dimensional structure of the wild-type peptide. In contrast, our activity assays show that changes in cytotoxicity are related to the chemical nature of certain residues. Our results suggest that the toxic activity of r-tamapin on Jurkat and breast cancer cells could be mediated by the interaction of charged residues in tamapin with KCa2.2 channels via the apoptotic cell death pathway.


    Related Citations: 
    • Tamapin, a venom peptide from the Indian red scorpion (Mesobuthus tamulus) that targets small conductance Ca2+-activated K+ channels and afterhyperpolarization currents in central neurons.
      Pedarzani, P.,D'hoedt, D.,Doorty, K.B.,Wadsworth, J.D.,Joseph, J.S.,Jeyaseelan, K.,Kini, R.M.,Gadre, S.V.,Sapatnekar, S.M.,Stocker, M.,Strong, P.N.
      (2002) J.Biol.Chem. 277: 46101


    Organizational Affiliation

    Instituto de Química, Universidad Nacional Autónoma de México , Ciudad Universitaria, Circuito Exterior s/n, México, D.F. 04510, México.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium channel toxin alpha-KTx 5.4
A
33Hottentotta tamulusMutation(s): 0 
Find proteins for P59869 (Hottentotta tamulus)
Go to UniProtKB:  P59869
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 17 
  • Selection Criteria: target function 
  • Olderado: 2KY3 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-06-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-05-28
    Type: Database references
  • Version 1.3: 2014-07-02
    Type: Database references
  • Version 1.4: 2014-10-08
    Type: Database references