Mitochondrial energy metabolism regulates the nutrient import activity and endocytosis of APC transporters.

Mitochondrial energy metabolism regulates the nutrient import activity and endocytosis of APC transporters.
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DOI:
10.1002/1873-3468.14314
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发表时间:
2022-05
期刊:
影响因子:
3.5
通讯作者:
Babst, Markus
Babst, Markus
中科院分区:
生物学3区
文献类型:
--
作者:
Moharir, Akshay;Gay, Lincoln;Babst, Markus

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预计apc型转运体的营养输入具有高能量需求,因为它依赖于由atp驱动的质子泵Pma1建立的质膜质子梯度。我们发现Pma1确实是一个主要的能量消耗者,它的活动与细胞ATP水平密切相关。急性呼吸丧失引起的Pma1活性降低导致细胞质pH急剧下降,从而引发主要质子输入蛋白APC转运蛋白的下调。这种调节系统可能是APC转运体在许多环境胁迫下快速内吞的原因。此外,我们还展示了呼吸在提供ATP以维持有效营养摄取的强质子梯度方面的重要性。我们的研究强调了呼吸作用对于通常用于细胞生物学研究的酿酒酵母菌株的重要性。我们表明,发酵不能弥补线粒体ATP生产的缺乏。因此,呼吸作用的丧失降低了质膜质子梯度,从而减慢了养分的输入和生长。
Nutrient import by APC-type transporters is predicted to have a high energy demand because it depends on the plasma membrane proton gradient established by the ATP-driven proton pump Pma1. We show that Pma1 is indeed a major energy consumer and its activity is tightly linked to the cellular ATP levels. The low Pma1 activity caused by acute loss of respiration resulted in a dramatic drop in cytoplasmic pH, which triggered the downregulation of the major proton importers, the APC transporters. This regulatory system is likely the reason for the observed rapid endocytosis of APC transporters during many environmental stresses. Furthermore, we show the importance of respiration in providing ATP to maintain a strong proton gradient for efficient nutrient uptake. Our study highlights the importance of respiration for Saccharomyces cerevisiae strains commonly used for cell biological studies. We show that fermentation does not compensate for the lack of mitochondrial ATP production. As a consequence, loss of respiration reduces the plasma membrane proton gradient, which slows both nutrient import and growth.
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