2WX3 image
Deposition Date 2009-11-01
Release Date 2009-12-01
Last Version Date 2024-05-08
Entry Detail
PDB ID:
2WX3
Title:
Asymmetric trimer of the human DCP1a C-terminal domain
Biological Source:
Source Organism:
HOMO SAPIENS (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.31 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:MRNA-DECAPPING ENZYME 1A
Gene (Uniprot):DCP1A
Chain IDs:A, B, C
Chain Length:51
Number of Molecules:3
Biological Source:HOMO SAPIENS
Primary Citation
Dcp1 Forms Asymmetric Trimers to Assemble Into Active Mrna Decapping Complexes in Metazoa.
Proc.Natl.Acad.Sci.USA 106 21591 ? (2009)
PMID: 19966221 DOI: 10.1073/PNAS.0909871106

Abstact

DCP1 stimulates the decapping enzyme DCP2, which removes the mRNA 5' cap structure committing mRNAs to degradation. In multicellular eukaryotes, DCP1-DCP2 interaction is stabilized by additional proteins, including EDC4. However, most information on DCP2 activation stems from studies in S. cerevisiae, which lacks EDC4. Furthermore, DCP1 orthologs from multicellular eukaryotes have a C-terminal extension, absent in fungi. Here, we show that in metazoa, a conserved DCP1 C-terminal domain drives DCP1 trimerization. Crystal structures of the DCP1-trimerization domain reveal an antiparallel assembly comprised of three kinked alpha-helices. Trimerization is required for DCP1 to be incorporated into active decapping complexes and for efficient mRNA decapping in vivo. Our results reveal an unexpected connectivity and complexity of the mRNA decapping network in multicellular eukaryotes, which likely enhances opportunities for regulating mRNA degradation.

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