4OM4

Crystal structure of CTX A2 from Taiwan Cobra (Naja naja atra)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Endocytotic Routes of Cobra Cardiotoxins Depend on Spatial Distribution of Positively Charged and Hydrophobic Domains to Target Distinct Types of Sulfated Glycoconjugates on Cell Surface.

Lee, S.C.Lin, C.C.Wang, C.H.Wu, P.L.Huang, H.W.Chang, C.I.Wu, W.G.

(2014) J.Biol.Chem. 289: 20170-20181

  • DOI: 10.1074/jbc.M114.557157
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cobra cardiotoxins (CTX) are a family of three-fingered basic polypeptides known to interact with diverse targets such as heparan sulfates, sulfatides, and integrins on cell surfaces. After CTX bind to the membrane surface, they are internalized to i ...

    Cobra cardiotoxins (CTX) are a family of three-fingered basic polypeptides known to interact with diverse targets such as heparan sulfates, sulfatides, and integrins on cell surfaces. After CTX bind to the membrane surface, they are internalized to intracellular space and exert their cytotoxicity via an unknown mechanism. By the combined in vitro kinetic binding, three-dimensional x-ray structure determination, and cell biology studies on the naturally abundant CTX homologues from the Taiwanese cobra, we showed that slight variations on the spatial distribution of positively charged or hydrophobic domains among CTX A2, A3, and A4 could lead to significant changes in their endocytotic pathways and action mechanisms via distinct sulfated glycoconjugate-mediated processes. The intracellular locations of these structurally similar CTX after internalization are shown to vary between the mitochondria and lysosomes via either dynamin2-dependent or -independent processes with distinct membrane cholesterol sensitivity. Evidence is presented to suggest that the shifting between the sulfated glycoconjugates as distinct targets of CTX A2, A3, and A4 might play roles in the co-evolutionary arms race between venomous snake toxins to cope with different membrane repair mechanisms at the cellular levels. The sensitivity of endocytotic routes to the spatial distribution of positively charged or hydrophobic domains may provide an explanation for the diverse endocytosis pathways of other cell-penetrating basic polypeptides.


    Organizational Affiliation

    From the School of Medicine, FuJen Catholic University, Xinzhuang District, New Taipei City, 24205, Taiwan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytotoxin 2
A, B, C, D, E
60Naja atraMutation(s): 0 
Find proteins for P01442 (Naja atra)
Go to UniProtKB:  P01442
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.197 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 107.412α = 90.00
b = 107.412β = 90.00
c = 100.256γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
DENZOdata reduction
PHASERphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
HKL-2000data collection
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-06-11
    Type: Initial release
  • Version 1.1: 2014-07-02
    Type: Database references
  • Version 1.2: 2014-07-30
    Type: Database references
  • Version 1.3: 2017-11-22
    Type: Refinement description