Eisosome protein Pil1 regulates mitochondrial morphology, mitophagy, and cell death in Saccharomyces cerevisiae

Mitochondrial morphology and dynamics maintain mitochondrial integrity by regulating its size, shape, distribution, and connectivity, thereby modulating various cellular processes. Several studies have established a functional link between mitochondrial dynamics, mitophagy, and cell death, but furth...

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Bibliographic Details
Published in:	The Journal of biological chemistry Vol. 298; no. 11; p. 102533
Main Authors:	Pal, Amita, Paripati, Arun Kumar, Deolal, Pallavi, Chatterjee, Arpan, Prasad, Pushpa Rani, Adla, Priyanka, Sepuri, Naresh Babu V.
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 01-11-2022 American Society for Biochemistry and Molecular Biology
Subjects:	autophagy Cell Death mitochondria Mitochondria - genetics Mitochondria - metabolism Mitochondrial Dynamics - physiology Mitochondrial Proteins - genetics Mitochondrial Proteins - metabolism mitophagy Mitophagy - physiology Phosphoproteins - genetics Phosphoproteins - metabolism protein aggregation reactive oxygen species (ROS) Saccharomyces cerevisiae Saccharomyces cerevisiae - genetics Saccharomyces cerevisiae - metabolism Saccharomyces cerevisiae Proteins - genetics Saccharomyces cerevisiae Proteins - metabolism autophagy cell death mitochondria reactive oxygen species (ROS) SMD SC mitophagy BAR SML SD-N SCD protein aggregation ROS Saccharomyces cerevisiae
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Summary:	Mitochondrial morphology and dynamics maintain mitochondrial integrity by regulating its size, shape, distribution, and connectivity, thereby modulating various cellular processes. Several studies have established a functional link between mitochondrial dynamics, mitophagy, and cell death, but further investigation is needed to identify specific proteins involved in mitochondrial dynamics. Any alteration in the integrity of mitochondria has severe ramifications that include disorders like cancer and neurodegeneration. In this study, we used budding yeast as a model organism and found that Pil1, the major component of the eisosome complex, also localizes to the periphery of mitochondria. Interestingly, the absence of Pil1 causes the branched tubular morphology of mitochondria to be abnormally fused or aggregated, whereas its overexpression leads to mitochondrial fragmentation. Most importantly, pil1Δ cells are defective in mitophagy and bulk autophagy, resulting in elevated levels of reactive oxygen species and protein aggregates. In addition, we show that pil1Δ cells are more prone to cell death. Yeast two-hybrid analysis and co-immunoprecipitations show the interaction of Pil1 with two major proteins in mitochondrial fission, Fis1 and Dnm1. Additionally, our data suggest that the role of Pil1 in maintaining mitochondrial shape is dependent on Fis1 and Dnm1, but it functions independently in mitophagy and cell death pathways. Together, our data suggest that Pil1, an eisosome protein, is a novel regulator of mitochondrial morphology, mitophagy, and cell death.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0021-9258 1083-351X
DOI:	10.1016/j.jbc.2022.102533