Coding region polyadenylation generates a truncated tRNA synthetase that counters translation repression.
Coding region polyadenylation generates a truncated tRNA synthetase that counters translation repression.
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DOI:
10.1016/j.cell.2012.02.018
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发表时间:
2012-03-30
期刊:
影响因子:
64.5
通讯作者:
Fox PL
中科院分区:
文献类型:
--
作者:
Yao P;Potdar AA;Arif A;Ray PS;Mukhopadhyay R;Willard B;Xu Y;Yan J;Saidel GM;Fox PL
Post-transcriptional 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. Differential GAIT (Gamma-interferon Activated Inhibitor of Translation) complex activation repressed VEGF-A synthesis to a low, constant rate despite high, variable VEGFA mRNA expression. Dynamic model simulations indicated the presence of an unidentified, inhibitory GAIT element-interacting factor. We discovered a truncated form of glutamyl-prolyl tRNA synthetase (EPRS), the GAIT constituent that binds the 3’-UTR GAIT element in target transcripts. The truncated protein, EPRSN1, prevents binding of functional GAIT complex. EPRSN1 mRNA is generated by a remarkable polyadenylation-directed conversion of a Tyr codon in the EPRS coding sequence to a stop codon (PAY*). By low-level protection of GAIT element-bearing transcripts, EPRSN1 imposes a robust “translational trickle” of target protein expression. Genome-wide analysis shows PAY* generates multiple truncated transcripts thereby contributing to transcriptome expansion.
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影响因子:
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作者:
Arif, Abul;Jia, Jie;Mukhopadhyay, Rupak;Willard, Belinda;Kinter, Michael;Fox, Paul L.
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