Structure of the activated Edc1-Dcp1-Dcp2-Edc3 mRNA decapping complex with substrate analog poised for catalysis
Journal Article
·
· Nature Communications
- Univ. of California, San Francisco, CA (United States). Dept. of Pharmaceutical Chemistry; DOE/OSTI
- Univ. of California, San Francisco, CA (United States). Dept. of Pharmaceutical Chemistry; Univ. of California, San Francisco, CA (United States). Dept. of Program in Chemistry and Chemical Biology
- Univ. of Warsaw (Poland). Division of Biophysics, Inst. of Experimental Physics; Univ. of Warsaw (Poland). Centre of New Technologies
- Univ. of Warsaw (Poland). Centre of New Technologies
The conserved decapping enzyme Dcp2 recognizes and removes the 5' eukaryotic cap from mRNA transcripts in a critical step of many cellular RNA decay pathways. Dcp2 is a dynamic enzyme that functions in concert with the essential activator Dcp1 and a diverse set of coactivators to selectively and efficiently decap target mRNAs in the cell. Here we present a 2.84 Å crystal structure of K. lactis Dcp1–Dcp2 in complex with coactivators Edc1 and Edc3, and with substrate analog bound to the Dcp2 active site. Our structure shows how Dcp2 recognizes cap substrate in the catalytically active conformation of the enzyme, and how coactivator Edc1 forms a three-way interface that bridges the domains of Dcp2 to consolidate the active conformation. Kinetic data reveal Dcp2 has selectivity for the first transcribed nucleotide during the catalytic step. The heterotetrameric Edc1–Dcp1–Dcp2–Edc3 structure shows how coactivators Edc1 and Edc3 can act simultaneously to activate decapping catalysis.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1624082
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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