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- W2000598751 abstract "IRF5 plays a key role in the induction of pro-inflammatory cytokines, contributing to the plasticity and polarisation of macrophages to an M1 phenotype and initiation of a potent T(H)1-T(H)17 response. To better understand the means of IRF5 transcriptional action, we conducted a screen for IRF5-interacting partners by affinity purification coupled to mass spectrometry and identified KAP1/TRIM28 as a novel protein-protein interaction partner of IRF5. KAP1 acts as a transcriptional co-repressor, chiefly via recruitment of complexes involved in chromatin silencing, such as histone deacetylases and methyltransferases. We mapped the N-terminus of IRF5, encompassing its DNA-binding domain together with a highly intrinsically disordered region, as crucial for the IRF5-KAP1 interaction interface, and demonstrated that IRF5 can also form complexes with the methyltransferase SETDB1. Knockdown of KAP1 (TRIM28) gene expression in human M1 macrophages potentiated IRF5-mediated expression of TNF and other M1 macrophage markers. This effect may be linked to methyltransferase activity of SETDB1, such as trimethylation of lysine 9 of histone 3 (H3K9me3), deposition of which was decreased at the human TNF locus upon KAP1 knockdown. Our study furthers an understanding of the complex molecular interactions between the TRIM and IRF protein families, and highlights a role of the inhibitory properties of KAP1 in association with IRF5-mediated gene expression." @default.
- W2000598751 created "2016-06-24" @default.
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- W2000598751 date "2012-12-01" @default.
- W2000598751 modified "2023-10-18" @default.
- W2000598751 title "KAP1/TRIM28: an inhibitor of IRF5 function in inflammatory macrophages." @default.
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- W2000598751 doi "https://doi.org/10.1016/j.imbio.2012.07.026" @default.
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