2I7V image
Deposition Date 2006-08-31
Release Date 2007-01-30
Last Version Date 2024-02-21
Entry Detail
PDB ID:
2I7V
Title:
Structure of Human CPSF-73
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cleavage and polyadenylation specificity factor 73 kDa subunit
Gene (Uniprot):CPSF3
Chain IDs:A
Chain Length:459
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Polyadenylation factor CPSF-73 is the pre-mRNA 3'-end-processing endonuclease.
Nature 444 953 956 (2006)
PMID: 17128255 DOI: 10.1038/nature05363

Abstact

Most eukaryotic messenger RNA precursors (pre-mRNAs) undergo extensive maturational processing, including cleavage and polyadenylation at the 3'-end. Despite the characterization of many proteins that are required for the cleavage reaction, the identity of the endonuclease is not known. Recent analyses indicated that the 73-kDa subunit of cleavage and polyadenylation specificity factor (CPSF-73) might be the endonuclease for this and related reactions, although no direct data confirmed this. Here we report the crystal structures of human CPSF-73 at 2.1 A resolution, complexed with zinc ions and a sulphate that might mimic the phosphate group of the substrate, and the related yeast protein CPSF-100 (Ydh1) at 2.5 A resolution. Both CPSF-73 and CPSF-100 contain two domains, a metallo-beta-lactamase domain and a novel beta-CASP (named for metallo-beta-lactamase, CPSF, Artemis, Snm1, Pso2) domain. The active site of CPSF-73, with two zinc ions, is located at the interface of the two domains. Purified recombinant CPSF-73 possesses RNA endonuclease activity, and mutations that disrupt zinc binding in the active site abolish this activity. Our studies provide the first direct experimental evidence that CPSF-73 is the pre-mRNA 3'-end-processing endonuclease.

Legend

Protein

Chemical

Disease

Primary Citation of related structures