Coding Region Polyadenylation Generates a Truncated TRNA Synthetase That Counters Translation Repression

Overview

Journal Cell

Publisher Cell Press

Specialty Cell Biology

Date 2012 Mar 6

PMID 22386318

Citations 65

Authors

Peng Yao

Alka A Potdar

Abul Arif

Partho Sarothi Ray

Rupak Mukhopadhyay

Belinda Willard

Yichi Xu

Jun Yan

Gerald M Saidel

Paul L Fox

Affiliations

Soon will be listed here.

Abstract

Posttranscriptional regulatory mechanisms superimpose "fine-tuning" control upon "on-off" switches characteristic of gene transcription. We have exploited computational modeling with experimental validation to resolve an anomalous relationship between mRNA expression and protein synthesis. The GAIT (gamma-interferon-activated inhibitor of translation) complex repressed VEGF-A synthesis to a low, constant rate independent of VEGF-A mRNA expression levels. Dynamic model simulations predicted an inhibitory GAIT-element-interacting factor to account for this relationship and led to the identification of a truncated form of glutamyl-prolyl tRNA synthetase (EPRS), a GAIT constituent that mediates binding to target transcripts. The truncated protein, EPRS(N1), shields GAIT-element-bearing transcripts from the inhibitory GAIT complex, thereby dictating a "translational trickle" of GAIT target proteins. EPRS(N1) mRNA is generated by polyadenylation-directed conversion of a Tyr codon in the EPRS-coding sequence to a stop codon (PAY(∗)). Genome-wide analysis revealed multiple candidate PAY(∗) targets, including the authenticated target RRM1, suggesting a general mechanism for production of C terminus-truncated regulatory proteins.

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