Structural changes enable start codon recognition by the eukaryotic translation initiation complex.

Abstract:

:During eukaryotic translation initiation, initiator tRNA does not insert fully into the P decoding site on the 40S ribosomal subunit. This conformation (POUT) is compatible with scanning mRNA for the AUG start codon. Base pairing with AUG is thought to promote isomerization to a more stable conformation (PIN) that arrests scanning and promotes dissociation of eIF1 from the 40S subunit. Here, we present a cryoEM reconstruction of a yeast preinitiation complex at 4.0 Å resolution with initiator tRNA in the PIN state, prior to eIF1 release. The structure reveals stabilization of the codon-anticodon duplex by the N-terminal tail of eIF1A, changes in the structure of eIF1 likely instrumental in its subsequent release, and changes in the conformation of eIF2. The mRNA traverses the entire mRNA cleft and makes connections to the regulatory domain of eIF2?, eIF1A, and ribosomal elements that allow recognition of context nucleotides surrounding the AUG codon.

journal_name

Cell

journal_title

Cell

authors

Hussain T,Llácer JL,Fernández IS,Munoz A,Martin-Marcos P,Savva CG,Lorsch JR,Hinnebusch AG,Ramakrishnan V

doi

10.1016/j.cell.2014.10.001

subject

Has Abstract

pub_date

2014-10-23 00:00:00

pages

597-607

issue

3

eissn

0092-8674

issn

1097-4172

pii

S0092-8674(14)01281-1

journal_volume

159

pub_type

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