1QMT image
Deposition Date 1999-10-06
Release Date 2000-02-04
Last Version Date 2024-11-20
Entry Detail
PDB ID:
1QMT
Keywords:
Title:
Recombinant Human Eosinophil Cationic Protein
Biological Source:
Source Organism:
HOMO SAPIENS (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.22
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 63
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:EOSINOPHIL CATIONIC PROTEIN
Gene (Uniprot):RNASE3
Chain IDs:A
Chain Length:134
Number of Molecules:1
Biological Source:HOMO SAPIENS
Primary Citation
The Crystal Structure of Eosinophil Cationic Protein at 2.4 A Resolution
Biochemistry 38 16794 ? (1999)
PMID: 10606511 DOI: 10.1021/BI9919145

Abstact

Eosinophil cationic protein (ECP) is located in the matrix of the eosinophil's large specific granule and has marked toxicity for a variety of helminth parasites, hemoflagellates, bacteria, single-stranded RNA virus, and mammalian cells and tissues. It belongs to the bovine pancreatic ribonuclease A (RNase A) family and exhibits ribonucleolytic activity which is about 100-fold lower than that of a related eosinophil ribonuclease, the eosinophil-derived neurotoxin (EDN). The crystal structure of human ECP, determined at 2.4 A, is similar to that of RNase A and EDN. It reveals that residues Gln-14, His-15, Lys-38, Thr-42, and His-128 at the active site are conserved as in all other RNase A homologues. Nevertheless, evidence for considerable divergence of ECP is also implicit in the structure. Amino acid residues Arg-7, Trp-10, Asn-39, His-64, and His-82 appear to play a key part in the substrate specificity and low catalytic activity of ECP. The structure also shows how the cationic residues are distributed on the surface of the ECP molecule that may have implications for an understanding of the cytotoxicity of this enzyme.

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Primary Citation of related structures