Niu Zhai, Zhong-liang Zhao, Mo-bin Cheng, Yu-wei Di, Hai-xia Yan, Chun-yu Cao, Hui Dai, Ye Zhang, Yu-fei Shen
Department of Biochemistry and Molecular Biology, National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, 5 Dongdan Santiao, Beijing 100005, China.
Journal of molecular cell biology 2012 AugRibosome biogenesis is critical in the growth of eukaryotic cells, in which the synthesis of precursor ribosomal RNA is the first and rate-limiting step. Here, we show that human PIH1 domain-containing protein 1 (PIH1) interacts directly with histone H4 and recruits the Brg1-SWI/SNF complex via SNF5 to human rRNA genes. This process is likely involved in PIH1-dependent DNase I-hypersensitive chromatin remodeling at the core promoter of the rRNA genes. PIH1 mediates the occupancy of not only the Brg1 complex but also the Pol I complex at the core promoter and enhances transcription initiation of rRNA genes. Additionally, the interaction between PIH1 and H4K16 expels TIP5, a component of the silencing nucleolar remodeling complex (NoRC), from the core region, suggesting that PIH1 is involved in the derepression of NoRC-silenced rRNA genes. These data indicate that PIH1 is a positive regulator of human rRNA genes and is of great importance for the recovery of human cells from nutrient starvation and the transition to glucose-induced exponential growth in vivo.
Niu Zhai, Zhong-liang Zhao, Mo-bin Cheng, Yu-wei Di, Hai-xia Yan, Chun-yu Cao, Hui Dai, Ye Zhang, Yu-fei Shen. Human PIH1 associates with histone H4 to mediate the glucose-dependent enhancement of pre-rRNA synthesis. Journal of molecular cell biology. 2012 Aug;4(4):231-41
PMID: 22368283
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