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Wu, Longtao; Crawley, Clayton D.; Garofalo, Andrea; Nichols, Jackie W.; Campbell, Paige-Ashley; Khramtsova, Galina F.; Olopade, Olufunmilayo I.; Weichselbaum, Ralph R.; Yamini, Bakhtiar
Nature communications, 10/2020, Letnik: 11, Številka: 1Journal Article
Abstract p50, the mature product of NFKB1 , is constitutively produced from its precursor, p105. Here, we identify BARD1 as a p50-interacting factor. p50 directly associates with the BARD1 BRCT domains via a C-terminal phospho-serine motif. This interaction is induced by ATR and results in mono-ubiquitination of p50 by the BARD1/BRCA1 complex. During the cell cycle, p50 is mono-ubiquitinated in S phase and loss of this post-translational modification increases S phase progression and chromosomal breakage. Genome-wide studies reveal a substantial decrease in p50 chromatin enrichment in S phase and Cycln E is identified as a factor regulated by p50 during the G1 to S transition. Functionally, interaction with BARD1 promotes p50 protein stability and consistent with this, in human cancer specimens, low nuclear BARD1 protein strongly correlates with low nuclear p50. These data indicate that p50 mono-ubiquitination by BARD1/BRCA1 during the cell cycle regulates S phase progression to maintain genome integrity.
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