CNRS, UMR 8126, Université Paris-Sud 11, Institut Gustave Roussy, 114, rue Edouard Vaillant, 94805, Villejuif, France.
CNRS, IBGC, UMR 5095, 1, rue Camille Saint-Saens, 33000, Bordeaux, France.
Cell Mol Life Sci. 2019 Apr;76(8):1623-1640. doi: 10.1007/s00018-019-03015-6. Epub 2019 Jan 23.
The major signaling pathway that regulates cell growth and metabolism is under the control of the target of rapamycin complex 1 (TORC1). In Saccharomyces cerevisiae the SEA complex is one of the TORC1 upstream regulators involved in amino acid sensing and autophagy. Here, we performed analysis of the expression, interactions and localization of SEA complex proteins under different conditions, varying parameters such as sugar source, nitrogen availability and growth phase. Our results show that the SEA complex promotes mitochondria degradation either by mitophagy or by general autophagy. In addition, the SEACIT subcomplex is involved in the maintenance of the vacuole-mitochondria contact sites. Thus, the SEA complex appears to be an important link between the TORC1 pathway and regulation of mitochondria quality control.
调控细胞生长和代谢的主要信号通路受雷帕霉素靶蛋白复合物 1(TORC1)的控制。在酿酒酵母中,SEA 复合物是参与氨基酸感应和自噬的 TORC1 上游调节剂之一。在这里,我们在不同条件下(例如糖源、氮源可用性和生长阶段)对 SEA 复合物蛋白的表达、相互作用和定位进行了分析。我们的结果表明,SEA 复合物通过线粒体自噬或一般自噬促进线粒体降解。此外,SEACIT 亚复合物参与维持液泡-线粒体接触位点。因此,SEA 复合物似乎是 TORC1 途径和调节线粒体质量控制之间的重要联系。