期刊
NATURE
卷 512, 期 7513, 页码 208-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature13401
关键词
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资金
- Hans und Ilse Breuer Foundation
- Fritz Thyssen Foundation
- Deutsche Forschungsgemeinschaft (DFG)
- ERC
During cap-dependent eukaryotic translation initiation, ribosomes scan messenger RNA from the 5' end to the first AUG start codon with favourable sequence context(1,2). For many mRNAs this AUG belongs to a short upstream open reading frame (uORF)(3), and translation of the main downstream ORF requires re-initiation, an incompletely understood process(1,4-6). Re-initiation is thought to involve the same factors as standard initiation(1,5,7). It is unknown whether any factors specifically affect translation re-initiation without affecting standard cap-dependent translation. Here we uncover the non-canonical initiation factors density regulated protein (DENR) and multiple copies in T-cell lymphoma-1(MCT-1; also called MCTS1 inhumans) as the first selective regulators of eukaryotic re-initiation. mRNAs containing upstream ORFs with strong Kozak sequences selectively require DENR-MCT-1 for their proper translation, yielding a novel class of mRNAs that can be co-regulated and that is enriched for regulatory proteins such as oncogenic kinases. Collectively, our data reveal that cells have a previously unappreciated translational control system with a key role in supporting proliferation and tissue growth.
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