G3BP1 (G3BP stress granule assembly factor 1) is a multifunctional RNA-binding protein that serves as a central hub in cellular stress responses and innate immunity. Its primary function involves acting as a molecular switch that triggers liquid-liquid phase separation (LLPS) to assemble stress granules in response to elevated intracellular RNA concentrations 1. G3BP1 undergoes LLPS through interactions between three intrinsically disordered regions, with regulation fine-tuned by phosphorylation 1. Mechanistically, G3BP1 forms the core of a protein-RNA interaction network that creates membraneless stress granule compartments, which sequester mRNAs and stalled translation complexes during cellular stress 1. Beyond stress granule assembly, G3BP1 plays crucial roles in innate immunity by promoting cGAS activation for cytosolic DNA sensing and enhancing DNA-induced interferon production 2. The protein also suppresses mTORC1 signaling by tethering the TSC complex to lysosomes 3 and participates in structure-mediated RNA decay pathways 4. Clinically, G3BP1 is significant in cancer biology, where its dysregulation contributes to chemoresistance and metastasis in various cancers, including hepatocellular carcinoma and nasopharyngeal carcinoma 56. Additionally, stress granules function as 'shock absorbers' that prevent excessive immune responses to viral dsRNA 7.