4.7 Article

Quantitative Proteomics to Identify Nuclear RNA-Binding Proteins of Malat1

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MDPI
DOI: 10.3390/ijms21031166

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quantitative interactomics; lncRNA; RNA-binding proteins; Malat1

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  1. DFG [SPP1738, Bu2996/8-1]

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The long non-coding RNA Malat1 has been implicated in several human cancers, while the mechanism of action is not completely understood. As RNAs in cells function together with RNA-binding proteins (RBPs), the composition of their RBP complex can shed light on their functionality. We here performed quantitative interactomics of 14 non-overlapping fragments covering the full length of Malat1 to identify possible nuclear interacting proteins. Overall, we identified 35 candidates including 14 already known binders, which are able to interact with Malat1 in the nucleus. Furthermore, the use of fragments along the full-length RNA allowed us to reveal two hotspots for protein binding, one in the 5'-region and one in the 3'-region of Malat1. Our results provide confirmation on previous RNA-protein interaction studies and suggest new candidates for functional investigations.

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