{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRACK1 is an integral ribosomal component that dynamically regulates protein synthesis and quality control. It promotes 80S ribosome assembly by coupling the release of initiation factors with activated protein kinase C (PKC) signals and orchestrates ribosome‐associated quality control by modulating regulatory ubiquitylation of small ribosomal proteins during translation stalling. Moreover, RACK1 contributes to selective mRNA translation in viral infection contexts and anchors the microRNA‐induced silencing complex to translating ribosomes—linking extra‐ribosomal signal transduction with post‐initiation control and influencing oncogenic mRNA translation through post‐translational modifications."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its translational functions, RACK1 serves as a versatile signaling scaffold that integrates multiple receptor‐ and adhesion–mediated pathways. Through physical interactions with growth factor receptors such as the insulin‐like growth factor (IGF‐I) and insulin receptors, it modulates downstream cascades including MAPK/ERK, PI3K/Akt, and STAT3 signaling. By linking activated PKC isoforms to integrin complexes and other transmembrane receptors—and by directly associating with regulatory subunits of heterotrimeric G proteins—RACK1 controls focal adhesion dynamics, cytoskeletal reorganization, and the activation of stress kinases such as JNK via binding to MKK7. Such interactions govern processes including cell spreading, migration, and survival."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "23"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in translation and signal integration, RACK1 modulates cellular stress responses and oncogenic processes that affect cell cycle progression, apoptosis, and tumor metastasis. It regulates hypoxic adaptation by controlling the stability of HIF‐1α—via competitive interactions with chaperones and phosphatases—and influences cell cycle checkpoints and mitochondrial apoptotic pathways through inhibition of oncogenic kinases such as Src. Aberrant RACK1 expression is linked to aggressive phenotypes in diverse malignancies, including breast, gastric, lung, and cervical cancers, where it modulates migratory and invasive behavior through effects on Wnt/β‐catenin signaling and inflammatory cytokine production. In addition, RACK1 impacts endoplasmic reticulum stress responses in secretory cells, further underscoring its importance in maintaining cellular homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "24", "end_ref": "42"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn neuronal and neurotransmitter systems, RACK1 fine‐tunes receptor signaling by interacting with released Gβγ subunits and engaging with proteins such as the dopamine transporter, thereby modulating dopaminergic neurotransmission. 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