2CDX image
Entry Detail
PDB ID:
2CDX
Keywords:
Title:
STRUCTURE OF COBRA CARDIOTOXIN CTXI AS DERIVED FROM NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY AND DISTANCE GEOMETRY CALCULATIONS
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
1994-09-06
Release Date:
1994-11-30
Method Details:
Experimental Method:
Conformers Submitted:
11
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CARDIOTOXIN CTX I
Chain IDs:A
Chain Length:60
Number of Molecules:1
Biological Source:Naja atra
Ligand Molecules
Primary Citation
Structure of cobra cardiotoxin CTX I as derived from nuclear magnetic resonance spectroscopy and distance geometry calculations.
J.Mol.Biol. 240 445 458 (1994)
PMID: 8046750 DOI: 10.1006/jmbi.1994.1460

Abstact

The structure of cardiotoxin CTX I from Naja naja atra has been investigated by NMR spectroscopy. Sequence specific resonance assignments have been obtained for all backbone protons as well as for most side-chain protons. Distance geometry calculations were carried out using a metric matrix DG program. A total of 715 NOE constraints, 27 phi angle constraints and a list of the hydrogen bond donors were used for the metric matrix DG calculations and refinement. The average pairwise r.m.s.d. of the resulting structures was 1.01 A for the backbone heavy atoms, and 1.69 A for all heavy atoms. The protein is rich in beta structure and consists of a large triple-stranded, antiparallel beta sheet as well as a short double-stranded, antiparallel beta sheet. Non-regular hydrogen bonding is found between side-chains of the carboxy-terminal end and the rest of the core region. The structure is discussed in terms of evolutionary aspects as well as recent investigations about the biological function and active site.

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Primary Citation of related structures