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Structure of the activated Edc1-Dcp1-Dcp2-Edc3 mRNA decapping complex with substrate analog poised for catalysis

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [2]
  1. Univ. of California, San Francisco, CA (United States). Dept. of Pharmaceutical Chemistry; DOE/OSTI
  2. 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
  3. Univ. of Warsaw (Poland). Division of Biophysics, Inst. of Experimental Physics; Univ. of Warsaw (Poland). Centre of New Technologies
  4. 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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Cited By (10)

Pby1 is a direct partner of the Dcp2 decapping enzyme journal May 2020
Structural and molecular mechanisms for the control of eukaryotic 5′–3′ mRNA decay journal December 2018
Pat1 activates late steps in mRNA decay by multiple mechanisms journal November 2019
Control of mRNA decapping by autoinhibition journal March 2018
mRNA decapping: finding the right structures journal November 2018
mRNAs biotinylated within the 5′ cap and protected against decapping: new tools to capture RNA–protein complexes journal November 2018
Analysis of novel hyperosmotic shock response suggests “beads in liquid” cytosol structure journal January 2019
Decapping enzymes STOP “cancer” ribosomes in their tracks journal November 2018
Tumor suppressor PNRC 1 blocks r RNA maturation by recruiting the decapping complex to the nucleolus journal October 2018
General decapping activators target different subsets of inefficiently translated mRNAs journal December 2018

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