{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe microprotein PIGBOS1, consisting of 54 amino acids, has emerged as a key regulator of cellular homeostasis by modulating the unfolded protein response (UPR) in the face of ER stress. This protein is localized to the mitochondrial outer membrane, where it plays a pivotal role in coordinating communication between organelles. Its discovery underscores the significance of previously uncharacterized microproteins in the maintenance of cellular equilibrium."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n\nIn detail, PIGBOS1 interacts with the ER protein CLCC1 at specialized ER–mitochondria contact sites. This inter-organelle association is critical for fine-tuning the UPR, thereby ensuring that cells appropriately respond to the accumulation of unfolded proteins in the endoplasmic reticulum. Such coordination helps prevent an excessive stress response that could otherwise compromise cell function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n\nFunctionally, the loss of PIGBOS1 leads to an exacerbation of the unfolded protein response and an increased propensity for cell death, emphasizing its protective role in stress adaptation. The elucidation of PIGBOS1’s function not only expands our understanding of microprotein contributions to mitochondrial and ER crosstalk but also highlights their broader impact on cell survival and homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Qian Chu, Thomas F Martinez, Sammy Weiser Novak, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Regulation of the ER stress response by a mitochondrial microprotein."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Commun (2019)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41467-019-12816-z"}], "href": "https://doi.org/10.1038/s41467-019-12816-z"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "31653868"}], "href": "https://pubmed.ncbi.nlm.nih.gov/31653868"}]}]}]}