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Efficient analysis of mammalian polysomes in cells and tissues using ribo mega-SEC

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  • Harunori Yoshikawa
  • Mark Larance
  • Dylan J. Harney
  • Ramasubramanian Sundaramoorthy
  • Tony Ly
  • Tom Owen-Hughes
  • Angus I. Lamond

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Original languageEnglish
Article numbere36530
JournaleLIFE
Volume7
DOIs
Publication statusPublished - 10 Aug 2018

Abstract

We describe Ribo Mega-SEC, a powerful approach for the separation and biochemical analysis of mammalian polysomes and ribosomal subunits using Size Exclusion Chromatography and uHPLC. Using extracts from either cells, or tissues, polysomes can be separated within 15 min from sample injection to fraction collection. Ribo Mega-SEC shows translating ribosomes exist predominantly in polysome complexes in human cell lines and mouse liver tissue. Changes in polysomes are easily quantified between treatments, such as the cellular response to amino acid starvation. Ribo Mega-SEC is shown to provide an efficient, convenient and highly reproducible method for studying functional translation complexes. We show that Ribo Mega-SEC is readily combined with high-throughput MS-based proteomics to characterize proteins associated with polysomes and ribosomal subunits. It also facilitates isolation of complexes for electron microscopy and structural studies.

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