{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMSRB3 is a specialized methionine sulfoxide reductase that catalyzes the stereospecific reduction of oxidized methionine‐R‐sulfoxide back to methionine, thereby repairing oxidatively damaged proteins and maintaining cellular redox homeostasis. Its critical biochemical function is underscored by genetic studies showing that loss‐of‐function mutations—such as those that disrupt zinc‐binding in the enzyme—are linked to autosomal‐recessive nonsyndromic deafness, implicating mitochondrial dysfunction in auditory impairment. In addition, genome‐wide association studies have connected MSRB3 with key developmental processes including tooth eruption, while its N-terminal endoplasmic reticulum (ER) targeting signal displays antimicrobial activity against several Gram-negative bacteria. Work in model organisms further reveals that ER‐localized isoforms of MSRB3 enhance resistance to oxidative, heat, and ER stresses, extend lifespan, and regulate cell cycle progression by modulating stress‐related molecules such as heme oxygenase‑1, p21, and p27 through reactive oxygen species (ROS) and Nrf2 signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMSRB3 also plays a pivotal role in cancer cell biology. In tumor cells, deficiency of MSRB3 elevates ROS levels and disturbs mitochondrial function, thereby triggering the intrinsic apoptosis pathway and sensitizing cells to ER stress independent of p53 status. Conversely, in the context of mammary stem cells, MSRB3 is part of a preemptive protective program—co-regulated by transcription factors such as ZEB1—that prevents excessive oncogene-induced DNA damage and helps bypass the p53-mediated damage response, ultimately contributing to malignant transformation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in protein repair and tumor biology, alterations in MSRB3 expression and function are linked to neural and vascular pathologies. Abnormal MSRB3 expression patterns in the hippocampus correlate with Alzheimer’s disease-related neurodegeneration, while the enzyme’s well-defined three-step reduction mechanism via a thioredoxin recycling system underlies its broader cellular protective functions. Moreover, MSRB3 genetic variants have been associated with increased risk for brain infarcts and reduced hippocampal volume, and emerging evidence suggests an involvement of this enzyme in renal pathology, including clear cell renal carcinoma and doxorubicin-induced podocyte injury, where perturbation of MSRB3 expression exacerbates oxidative stress–mediated apoptosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Demetris Pillas, Clive J Hoggart, David M Evans, et al. 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