酵母液泡和脂滴之间代谢控制的接触位点。
A metabolically controlled contact site between vacuoles and lipid droplets in yeast.
机构信息
Institute of Cell Dynamics and Imaging, University of Münster, Von-Esmarch-Strasse 56, 48149 Münster, Germany; Cells in Motion Interfaculty Centre (CiM), University of Münster, Münster, Germany.
Institute of Neuropathology, University Medical Center Göttingen, 37099 Göttingen, Germany.
出版信息
Dev Cell. 2024 Mar 25;59(6):740-758.e10. doi: 10.1016/j.devcel.2024.01.016. Epub 2024 Feb 16.
The lipid droplet (LD) organization proteins Ldo16 and Ldo45 affect multiple aspects of LD biology in yeast. They are linked to the LD biogenesis machinery seipin, and their loss causes defects in LD positioning, protein targeting, and breakdown. However, their molecular roles remained enigmatic. Here, we report that Ldo16/45 form a tether complex with Vac8 to create vacuole lipid droplet (vCLIP) contact sites, which can form in the absence of seipin. The phosphatidylinositol transfer protein (PITP) Pdr16 is a further vCLIP-resident recruited specifically by Ldo45. While only an LD subpopulation is engaged in vCLIPs at glucose-replete conditions, nutrient deprivation results in vCLIP expansion, and vCLIP defects impair lipophagy upon prolonged starvation. In summary, Ldo16/45 are multifunctional proteins that control the formation of a metabolically regulated contact site. Our studies suggest a link between LD biogenesis and breakdown and contribute to a deeper understanding of how lipid homeostasis is maintained during metabolic challenges.
脂滴(LD)组织蛋白 Ldo16 和 Ldo45 影响酵母中 LD 生物学的多个方面。它们与 LD 生物发生机制 seipin 相关联,其缺失导致 LD 定位、蛋白质靶向和分解的缺陷。然而,它们的分子作用仍然是个谜。在这里,我们报告 Ldo16/45 与 Vac8 形成一个系绳复合物,以创建液泡脂滴(vCLIP)接触位点,即使在没有 seipin 的情况下也可以形成这些接触位点。磷酸肌醇转移蛋白(PITP)Pdr16 是另一种特定由 Ldo45 招募的 vCLIP 常驻蛋白。虽然只有一部分 LD 参与了葡萄糖充足条件下的 vCLIP,但营养剥夺导致 vCLIP 扩展,并且 vCLIP 缺陷会在长时间饥饿时损害脂噬作用。总之,Ldo16/45 是多功能蛋白,可控制代谢调节接触位点的形成。我们的研究表明 LD 生物发生和分解之间存在联系,并有助于更深入地了解在代谢挑战期间如何维持脂质动态平衡。
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