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The La-related protein 1-specific domain repurposes HEAT-like repeats to directly bind a 5'TOP sequence.

Nucleic Acids Res.2015 Sep 18;43(16):8077-88. Epub 2015 Jul 22
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摘要


La-related protein 1 regulates the stability of many mRNAs. These include 5'TOPs, mTOR-kinase responsive mRNAs with pyrimidine-rich which encode ribosomal proteins and translation factors. We determined that the highly conserved C-terminal DM15 region of human directly binds a 5'TOP sequence. The crystal structure of this DM15 region refined to 1.86 Å resolution has three structurally related and evolutionarily conserved helix-turn-helix modules within each monomer. These motifs resemble HEAT repeats, ubiquitous helical protein-binding structures, but their sequences are inconsistent with consensus sequences of known HEAT modules, suggesting this structure has been repurposed for RNA interactions. A putative mTORC1-recognition sequence sits within a flexible loop C-terminal to these repeats. We also present modelling of pyrimidine-rich single-stranded RNA onto the highly conserved surface of the DM15 region. These studies lay the foundation necessary for proceeding toward a structural mechanism by which Lduanyu371 links mTOR signalling to ribosome biogenesis.

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基因功能


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原始数据


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