Chaperonin CCT controls extracellular vesicle production and cell metabolism through kinesin dynamics.

Chaperonin CCT controls extracellular vesicle production and cell metabolism through kinesin dynamics.
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DOI:
10.1002/jev2.12333
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发表时间:
2023-06
影响因子:
16
通讯作者:
--
中科院分区:
医学2区
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--
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CCT需要通过驱动蛋白-1动力学调节细胞器间接触位点,调节过氧化物酶体和线粒体活性,并最终控制脂质细胞含量和代谢。细胞蛋白质稳态包括基因转录、蛋白质翻译、从头蛋白质折叠、翻译后修饰、分泌、降解和再循环。通过分析T细胞胞外囊泡(EV)的蛋白质组,我们发现了伴侣蛋白复合物CCT,参与特定蛋白质的正确折叠。通过siRNA限制CCT细胞含量,细胞经历脂质组成改变和代谢重新布线,朝向脂质依赖性代谢,过氧化物酶体和线粒体的活性增加。这是由于脂滴、线粒体、过氧化物酶体和内溶酶体系统之间的细胞器间接触的动力学失调。这一过程加速了多泡体的生物发生,通过基于微管的驱动蛋白马达的动态调节导致更高的EV产量。这些发现通过CCT的意想不到的作用将蛋白质稳态与脂质代谢联系起来。
CCT is required to regulate interorganelle contact sites through kinesin‐1 dynamics, modulating peroxisome and mitochondria activity, and ultimately controlling lipid cell content and metabolism. Cell proteostasis includes gene transcription, protein translation, folding of de novo proteins, post‐translational modifications, secretion, degradation and recycling. By profiling the proteome of extracellular vesicles (EVs) from T cells, we have found the chaperonin complex CCT, involved in the correct folding of particular proteins. By limiting CCT cell‐content by siRNA, cells undergo altered lipid composition and metabolic rewiring towards a lipid‐dependent metabolism, with increased activity of peroxisomes and mitochondria. This is due to dysregulation of the dynamics of interorganelle contacts between lipid droplets, mitochondria, peroxisomes and the endolysosomal system. This process accelerates the biogenesis of multivesicular bodies leading to higher EV production through the dynamic regulation of microtubule‐based kinesin motors. These findings connect proteostasis with lipid metabolism through an unexpected role of CCT.
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