Publikationsdatum:
2019
Beschreibung:
〈p〉Publication date: Available online 20 August 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Molecular Cell〈/p〉
〈p〉Author(s): Yanchang Li, Eric B. Dammer, Yuan Gao, Qiuyan Lan, Mark A. Villamil, Duc M. Duong, Chengpu Zhang, Lingyan Ping, Linda Lauinger, Karin Flick, Zhongwei Xu, Wei Wei, Xiaohua Xing, Lei Chang, Jianping Jin, Xuechuan Hong, Yunping Zhu, Junzhu Wu, Zixin Deng, Fuchu He〈/p〉
〈h5〉Summary〈/h5〉
〈div〉〈p〉A surprising complexity of ubiquitin signaling has emerged with identification of different ubiquitin chain topologies. However, mechanisms of how the diverse ubiquitin codes control biological processes remain poorly understood. Here, we use quantitative whole-proteome mass spectrometry to identify yeast proteins that are regulated by lysine 11 (K11)-linked ubiquitin chains. The entire Met4 pathway, which links cell proliferation with sulfur amino acid metabolism, was significantly affected by K11 chains and selected for mechanistic studies. Previously, we demonstrated that a K48-linked ubiquitin chain represses the transcription factor Met4. Here, we show that efficient Met4 activation requires a K11-linked topology. Mechanistically, our results propose that the K48 chain binds to a topology-selective tandem ubiquitin binding region in Met4 and competes with binding of the basal transcription machinery to the same region. The change to K11-enriched chain architecture releases this competition and permits binding of the basal transcription complex to activate transcription.〈/p〉〈/div〉
〈h5〉Graphical Abstract〈/h5〉
〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1097276519305040-fx1.jpg" width="375" alt="Graphical abstract for this article" title=""〉〈/figure〉〈/p〉〈/div〉
Print ISSN:
1097-2765
Digitale ISSN:
1097-4164
Thema:
Biologie
,
Medizin
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