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SNW1, a Novel Transcriptional Regulator of the NF-?B Pathway.


ABSTRACT: The nuclear factor kappa B (NF-?B) family of transcription factors plays a central role in coordinating the expression of genes that control inflammation, immune responses, cell proliferation, and a variety of other biological processes. In an attempt to identify novel regulators of this pathway, we performed whole-genome RNA interference (RNAi) screens in physiologically relevant human macrophages in response to lipopolysaccharide and tumor necrosis factor alpha (TNF-?). The top hit was SNW1, a splicing factor and transcriptional coactivator. SNW1 does not regulate the cytoplasmic components of the NF-?B pathway but complexes with the NF-?B heterodimer in the nucleus for transcriptional activation. We show that SNW1 detaches from its splicing complex (formed with SNRNP200 and SNRNP220) upon NF-?B activation and binds to NF-?B's transcriptional elongation partner p-TEFb. We also show that SNW1 is indispensable for the transcriptional elongation of NF-?B target genes such as the interleukin 8 (IL-8) and TNF genes. SNW1 is a unique protein previously shown to be involved in both splicing and transcription, and in this case, its role involves binding to the NF-?B-p-TEFb complex to facilitate transcriptional elongation of some NF-?B target genes.

SUBMITTER: Verma S 

PROVIDER: S-EPMC6336138 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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SNW1, a Novel Transcriptional Regulator of the NF-κB Pathway.

Verma Suneer S   De Jesus Paul P   Chanda Sumit K SK   Verma Inder M IM  

Molecular and cellular biology 20190116 3


The nuclear factor kappa B (NF-κB) family of transcription factors plays a central role in coordinating the expression of genes that control inflammation, immune responses, cell proliferation, and a variety of other biological processes. In an attempt to identify novel regulators of this pathway, we performed whole-genome RNA interference (RNAi) screens in physiologically relevant human macrophages in response to lipopolysaccharide and tumor necrosis factor alpha (TNF-α). The top hit was SNW1, a  ...[more]

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