| Literature DB >> 25843628 |
Ci Chu1, Qiangfeng Cliff Zhang2, Simão Teixeira da Rocha3, Ryan A Flynn2, Maheetha Bharadwaj2, J Mauro Calabrese4, Terry Magnuson5, Edith Heard3, Howard Y Chang6.
Abstract
Noncoding RNAs (ncRNAs) function with associated proteins to effect complex structural and regulatory outcomes. To reveal the composition and dynamics of specific noncoding RNA-protein complexes (RNPs) in vivo, we developed comprehensive identification of RNA binding proteins by mass spectrometry (ChIRP-MS). ChIRP-MS analysis of four ncRNAs captures key protein interactors, including a U1-specific link to the 3' RNA processing machinery. Xist, an essential lncRNA for X chromosome inactivation (XCI), interacts with 81 proteins from chromatin modification, nuclear matrix, and RNA remodeling pathways. The Xist RNA-protein particle assembles in two steps coupled with the transition from pluripotency to differentiation. Specific interactors include HnrnpK, which participates in Xist-mediated gene silencing and histone modifications but not Xist localization, and Drosophila Split ends homolog Spen, which interacts via the A-repeat domain of Xist and is required for gene silencing. Thus, Xist lncRNA engages with proteins in a modular and developmentally controlled manner to coordinate chromatin spreading and silencing.Entities:
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Year: 2015 PMID： 25843628 PMCID： PMC4425988 DOI： 10.1016/j.cell.2015.03.025
Source DB: PubMed Journal: Cell ISSN： 0092-8674 Impact factor: 41.582