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2017 ; 66
(2
): 194-205.e5
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eIF5A Functions Globally in Translation Elongation and Termination
#MMPMID28392174
Schuller AP
; Wu CC
; Dever TE
; Buskirk AR
; Green R
Mol Cell
2017[Apr]; 66
(2
): 194-205.e5
PMID28392174
show ga
The eukaryotic translation factor eIF5A, originally identified as an initiation
factor, was later shown to promote translation elongation of iterated proline
sequences. Using a combination of ribosome profiling and in vitro biochemistry,
we report a much broader role for eIF5A in elongation and uncover a critical
function for eIF5A in termination. Ribosome profiling of an eIF5A-depleted strain
reveals a global elongation defect, with abundant ribosomes stalling at many
sequences, not limited to proline stretches. Our data also show ribosome
accumulation at stop codons and in the 3' UTR, suggesting a global defect in
termination in the absence of eIF5A. Using an in vitro reconstituted translation
system, we find that eIF5A strongly promotes the translation of the stalling
sequences identified by profiling and increases the rate of peptidyl-tRNA
hydrolysis more than 17-fold. We conclude that eIF5A functions broadly in
elongation and termination, rationalizing its high cellular abundance and
essential nature.