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Daniel Gonçalves Carneiro, Thomas Clarke, Clare C Davies, Dalan Bailey
The technological revolution in high-throughput nucleic acid and protein analysis in the last 15 years has launched the field of 'omics' and led to great advances in our understanding of cell biology. Consequently the study of the cellular proteome and protein dynamics, in particular interactomics, has been a matter of intense investigation, specifically the determination and description of complex protein interaction networks in the cell, not only with other proteins but also with RNA and DNA. The analysis of these interactions, beginning with their identification and ultimately resulting in structural level examination, is one of the cornerstones of modern biological science underpinning basic research and impacting on applied biology, biomedicine and drug discovery...
February 15, 2016: Methods: a Companion to Methods in Enzymology
Emiliano P Ricci, Alper Kucukural, Can Cenik, Blandine C Mercier, Guramrit Singh, Erin E Heyer, Ami Ashar-Patel, Lingtao Peng, Melissa J Moore
Human Staufen1 (Stau1) is a double-stranded RNA (dsRNA)-binding protein implicated in multiple post-transcriptional gene-regulatory processes. Here we combined RNA immunoprecipitation in tandem (RIPiT) with RNase footprinting, formaldehyde cross-linking, sonication-mediated RNA fragmentation and deep sequencing to map Staufen1-binding sites transcriptome wide. We find that Stau1 binds complex secondary structures containing multiple short helices, many of which are formed by inverted Alu elements in annotated 3' untranslated regions (UTRs) or in 'strongly distal' 3' UTRs...
January 2014: Nature Structural & Molecular Biology
Guramrit Singh, Emiliano P Ricci, Melissa J Moore
Development of high-throughput approaches to map the RNA interaction sites of individual RNA binding proteins (RBPs) transcriptome-wide is rapidly transforming our understanding of post-transcriptional gene regulatory mechanisms. Here we describe a ribonucleoprotein (RNP) footprinting approach we recently developed for identifying occupancy sites of both individual RBPs and multi-subunit RNP complexes. RNA:protein immunoprecipitation in tandem (RIPiT) yields highly specific RNA footprints of cellular RNPs isolated via two sequential purifications; the resulting RNA footprints can then be identified by high-throughput sequencing (Seq)...
February 2014: Methods: a Companion to Methods in Enzymology
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