DENR-MCT-1 promotes translation re-initiation downstream of uORFs to control tissue growth

作者：Schleich Sibylle; Stras**urger Katrin; Janiesch Philipp Christoph; Koledachkina Tatyana; Miller Katharine K; Haneke Katharina; Cheng Yong Sheng; Kuechler Katrin; Stoecklin Georg; Duncan Kent E^*; Teleman Aurelio A

来源：Nature, 2014, 512(7513): 208-+.

DOI：10.1038/nature13401

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.

• 出版日期2014-8-14