{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMembrane‐associated RING‐CH 8 (MARCHF8) is a transmembrane E3 ubiquititin ligase that regulates the fate of a wide array of cell‐surface proteins. In immune cells, MARCHF8 ubiquitinates key immunoreceptors—including major histocompatibility complex class II, costimulatory molecules such as CD86, interleukin‐1 receptor accessory protein (IL1RAP), and TRAIL receptor 1—thereby promoting their endocytosis and lysosomal degradation. This modulation of receptor turnover impacts antigen presentation and inflammatory signaling. In addition, MARCHF8 controls the cell‐surface expression of other essential proteins such as the transferrin receptor, CD44, CD98, MHCI, and BST2, thereby influencing nutrient uptake and innate immune responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMARCHF8 also functions as a potent antiviral factor by targeting viral envelope glycoproteins and proteins involved in virus assembly. By catalyzing ubiquitination events, it impairs the incorporation and/or maturation of viral proteins—such as those derived from hepatitis C virus, influenza A virus (including the M2 protein), Ebola virus, vesicular stomatitis virus and HIV‐1—thereby suppressing viral entry and release. In some instances, MARCHF8’s activity relies on directing viral glycoproteins away from the plasma membrane toward lysosomal or intracellular compartments, while differential mechanisms (including ubiquitin‐dependent and tyrosine motif–dependent pathways) can be employed against distinct viruses. Furthermore, in the context of oncogenic viruses like human papillomavirus and Kaposi’s sarcoma–associated herpesvirus, MARCHF8 is upregulated to modulate host immune recognition."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in regulating immune receptor dynamics and antiviral defense, MARCHF8 contributes to cellular signaling processes that affect tumorigenesis. Elevated expression of MARCHF8 in various cancers—including HPV‐positive head and neck, gastric, hepatocellular, and colorectal carcinomas—has been shown to promote immune evasion and cell survival by downregulating death receptors and by modulating key signaling regulators such as PTEN. Moreover, MARCHF8 activity can be modulated by pathogen‐derived enzymes (for example, through acetylation by bacterial YopJ) and participates in antiviral responses against emerging pathogens like SARS‑CoV‑2 by targeting proteins required for efficient replication. Collectively, these findings highlight MARCHF8 as a multifaceted regulator of membrane protein homeostasis with significant implications for immunity, viral infection, and cancer biology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "20", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Eric Bartee, Craig A Eyster, Kasinath Viswanathan, et al. 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