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The ATPase BRG1/SMARCA4 is a protein interaction platform that recruits BAF subunits and the transcriptional repressor REST/NRSF in neural progenitor cells. | LitMetric

AI Article Synopsis

Article Abstract

The BAF complex (SWI/SNF) is an ATP-dependent chromatin remodeler that adapts the structural organization of the chromatin. Despite a growing understanding of the composition of BAF in different cell types, the interaction network within the BAF complex is poorly understood. Here, we characterized an isoform of the BRG1/SMARCA4 ATPase expressed in human neural progenitor cells. By electron microscopy and image processing, the neural BRG1/SMARCA4 shows an elongated globular structure, which provides a considerably larger surface than anticipated. We show that neural BRG1/SMARCA4 binds to BAF57/SMARCE1 and BAF60A/SMARCD1, two further components of BAF. Moreover, we demonstrate an interaction between the neural BRG1/SMARCA4 isoform and the central neurodevelopmental transcriptional repressor REST/NRSF. Our results provide insights into the assembly of a central transcriptional repressor complex, link the structure of the neural BRG1/SMARCA4 to its role as a protein-protein interaction platform and suggest BRG1/SMARCA4 as a key determinant that directs the BAF complex to specific DNA sites by interacting with transcription factors and regulators.

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http://dx.doi.org/10.1007/s11010-019-03600-0DOI Listing

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