The Mammalian Ribo-interactome Reveals Ribosome Functional Diversity and Heterogeneity.

The Mammalian Ribo-interactome Reveals Ribosome Functional Diversity and Heterogeneity.
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DOI:
10.1016/j.cell.2017.05.022
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发表时间:
2017-06-01
期刊:
影响因子:
64.5
通讯作者:
Barna M
Barna M
中科院分区:
生物学1区
文献类型:
--
作者:
Simsek D;Tiu GC;Flynn RA;Byeon GW;Leppek K;Xu AF;Chang HY;Barna M

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During eukaryotic evolution, ribosomes have considerably increased in size forming a surface exposed ribosomal RNA (rRNA) shell of unknown function, which may create an interface for yet uncharacterized interacting proteins. To investigate such protein interactions, we establish a ribosome affinity purification method that unexpectedly identified hundreds of ribosome associated proteins (RAPs) from categories including metabolism, cell cycle, as well as RNA and protein modifying enzymes that functionally diversify mammalian ribosomes. By further characterizing RAPs, we discover the presence of ufmylation, a metazoan-specific posttranslational modification, on ribosomes and define its direct substrates. Moreover, we show that the metabolic enzyme, pyruvate kinase muscle (PKM), interacts with sub-pools of endoplasmic reticulum (ER)-associated ribosomes, exerting a non-canonical function as an RNA binding protein in the translation of ER-destined mRNAs. Therefore, RAPs interconnect one of life’s most ancient molecular machines with diverse cellular processes, providing an additional layer of regulatory potential to protein expression.
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