1DTX image
Deposition Date 1991-04-29
Release Date 1992-01-15
Last Version Date 2024-10-16
Entry Detail
PDB ID:
1DTX
Keywords:
PRESYNAPTIC NEUROTOXIN
Title:
CRYSTAL STRUCTURE OF ALPHA-DENDROTOXIN FROM THE GREEN MAMBA VENOM AND ITS COMPARISON WITH THE STRUCTURE OF BOVINE PANCREATIC TRYPSIN INHIBITOR
Biological Source:
Source Organism:
Dendroaspis angusticeps (Taxon ID: 8618)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.20 Å
R-Value Observed:
0.16
Space Group:
P 21 21 21
1DTX validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:ALPHA-DENDROTOXIN
Chain IDs:A
Chain Length:59
Number of Molecules:1
Biological Source:Dendroaspis angusticeps
UniProt ID:P00980 Pfam ID:PF00014
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
PCA A GLN PYROGLUTAMIC ACID
Ligand Molecules
SO4
Primary Citation
Crystal structure of alpha-dendrotoxin from the green mamba venom and its comparison with the structure of bovine pancreatic trypsin inhibitor.
J.Mol.Biol. 224 671 683 (1992)
PMID: 1373774 DOI: 10.1016/0022-2836(92)90552-U

Abstact

The three-dimensional structure of alpha-dendrotoxin (alpha-DTX) from the green mamba (Dendroaspis angusticeps) venom has been determined crystallographically using the method of isomorphous replacement and refined at 2.2 A resolution using a restrained least-squares method. The crystallographic R-factor is 0.169 for all 3451 measured reflections between 7.0 and 2.2 A. Although the main-chain fold of alpha-DTX is similar to that of homologous bovine pancreatic trypsin inhibitor (BPTI), there are significant differences involving segments of the polypeptide chain close to the "antiprotease site" of BPTI. Comparison of the structure of alpha-DTX with the existing models of BPTI and its complexes with trypsin and kallikrein reveals structural differences that explain the inability of alpha-DTX to inhibit trypsin and chymotrypsin.

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Disease

Primary Citation of related structures
1DTX