{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPREX1 is a 185‐kDa Rac‐specific guanine nucleotide exchange factor (GEF) that functions as a “coincidence detector” by integrating signals from phosphatidylinositol 3,4,5‐trisphosphate (PIP3) and heterotrimeric Gβγ subunits. Early studies demonstrated that PREX1’s catalytic DH (Dbl homology) domain, in tandem with its adjacent pleckstrin homology (PH), DEP, and PDZ domains, is maintained in an autoinhibited conformation that is relieved upon membrane recruitment. Structural and biochemical analyses reveal that dual inputs—PIP3 binding to the PH domain and Gβγ engagement—promote conformational rearrangements that activate PREX1, enabling local Rac activation and subsequent regulation of actin dynamics and chemotaxis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPREX1 activity is further modulated by a complex network of regulatory events. Multiple studies have shown that phosphorylation events and interactions with kinases (including protein kinase A, protein kinase C, and p21-activated kinases) as well as phosphatases (such as PP1) fine-tune its activity. These post-translational modifications alter PREX1’s conformation and its interaction with other membrane or scaffolding proteins, thereby integrating inputs from receptor tyrosine kinases (RTKs), G protein–coupled receptors (GPCRs), and even mTOR signaling pathways. Such regulation determines its capacity to trigger Rac-dependent cytoskeletal rearrangements."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn cancer, PREX1 has emerged as a critical mediator of malignant cell behavior. Overexpression and hyperactivation of PREX1 have been associated with enhanced cell motility, invasion, and metastasis in breast, prostate, and glioblastoma contexts. By linking signals from ErbB/HER family receptors and chemokine receptors such as CXCR4 to Rac-driven cytoskeletal remodeling, PREX1 promotes invasive phenotypes, tumor angiogenesis, and even supports cancer stem cell properties. Its upregulation in tumors often correlates with poor prognosis, underscoring its potential as a therapeutic target for disrupting metastatic dissemination."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional roles for PREX1 have been uncovered in neuronal and immunological contexts. In neuronal cells, PREX1 influences neurite outgrowth and synaptic plasticity, contributing to mechanisms implicated in cognitive function and disorders such as autism spectrum disorders. In immune cells such as neutrophils and T lymphocytes, PREX1 regulates chemotactic responses, NADPH oxidase activity, and cytokine production, thereby modulating both innate and adaptive immune signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "36"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Heidi C E Welch, W John Coadwell, Christian D Ellson, et al. 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