1CHV

ELUCIDATION OF THE SOLUTION STRUCTURE OF CARDIOTOXIN ANALOGUE V FROM THE TAIWAN COBRA (NAJA NAJA ATRA) VENOM


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Elucidation of the solution structure of cardiotoxin analogue V from the Taiwan cobra (Naja naja atra)--identification of structural features important for the lethal action of snake venom cardiotoxins

Jayaraman, G.Kumar, T.K.S.Tsai, C.C.Chou, S.H.Ho, C.L.Yu, C.

(2000) Protein Sci. 9: 637-646

  • DOI: 10.1110/ps.9.4.637

  • PubMed Abstract: 
  • The aim of the present study is to understand the structural features responsible for the lethal activity of snake venom cardiotoxins. Comparison of the lethal potency of the five cardiotoxin isoforms isolated from the venom of Taiwan cobra (Naja naj ...

    The aim of the present study is to understand the structural features responsible for the lethal activity of snake venom cardiotoxins. Comparison of the lethal potency of the five cardiotoxin isoforms isolated from the venom of Taiwan cobra (Naja naja atra) reveals that the lethal potency of CTX I and CTX V are about twice of that exhibited by CTX II, CTX III, and CTX IV. In the present study, the solution structure of CTX V has been determined at high resolution using multidimensional proton NMR spectroscopy and dynamical simulated annealing techniques. Comparison of the high resolution solution structures of CTX V with that of CTX IV reveals that the secondary structural elements in both the toxin isoforms consist of a triple and double-stranded antiparallel beta-sheet domains. Critical examination of the three-dimensional structure of CTX V shows that the residues at the tip of Loop III form a distinct "finger-shaped" projection comprising of nonpolar residues. The occurrence of the nonpolar "finger-shaped" projection leads to the formation of a prominent cleft between the residues located at the tip of Loops II and III. Interestingly, the occurrence of a backbone hydrogen bonding (Val27CO to Leu48NH) in CTX IV is found to distort the "finger-shaped" projection and consequently diminish the cleft formation at the tip of Loops II and III. Comparison of the solution structures and lethal potencies of other cardiotoxin isoforms isolated from the Taiwan cobra (Naja naja atra) venom shows that a strong correlation exists between the lethal potency and occurrence of the nonpolar "finger-shaped" projection at the tip of Loop III. Critical analysis of the structures of the various CTX isoforms from the Taiwan cobra suggest that the degree of exposure of the cationic charge (to the solvent) contributed by the invariant lysine residue at position 44 on the convex side of the CTX molecules could be another crucial factor governing their lethal potency.


    Related Citations: 
    • Sequence Comparison and Computer Modelling of Cardiotoxins and Cobrotoxin Isolated from Taiwan Cobra
      Chiou, S.H.,Huang, C.C.,Huang, H.C.,Chen, S.T.,Wang, K.T.,Yang, C.C.
      (1995) BIOCHEM.BIOPHYS.RES.COMMUN. 206: 22
    • Snake Venom Cardiotoxins-Structure, Dynamics, Function and Folding
      Kumar, T.K.S.,Jayaraman, G.,Lee, C.S.,Arunkumar, A.I.,Sivaraman, T.,Samuel, D.,Yu, C.
      (1997) J.Biomol.Struct.Dyn. 15: 431
    • Amino Acid Sequence of a Cardiotoxin-Like Basic Polypeptide (CLBP) with Low Cytotoxic Activity Isolated from the Venom of Formosan Cobra (Naja Naja Atra)
      Takechi, M.,Tanaka, Y.,Hayashi, K.
      (1985) Biochem.Int. 11: 795
    • Cardiotoxin-Like Basic Protein (CLBP) from Naja Naja Atra is not a Cardiotoxin
      Sivaraman, T.,Kumar, T.K.S.,Yang, P.W.,Yu, C.
      (1997) Toxicon 35: 1367


    Organizational Affiliation

    Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (CARDIOTOXIN ANALOGUE V)
S
60Naja atraN/A
Find proteins for P07525 (Naja atra)
Go to UniProtKB:  P07525
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-30
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance