{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTMBIM4, also known as Golgi anti‐apoptotic protein (GAAP) or Lifeguard 4, is a highly conserved multi‐transmembrane protein that plays a central role in regulating cell survival. Widely expressed in eukaryotic cells and even encoded by some poxviruses, TMBIM4 suppresses both intrinsic and extrinsic apoptotic signals by modulating intracellular Ca²⁺ homeostasis. Through its ability to reduce Ca²⁺ release from intracellular stores and attenuate store‐operated Ca²⁺ entry, its overexpression protects against various apoptotic stimuli while siRNA‐mediated knockdown triggers cell death."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the structural level, TMBIM4 is characterized by a conserved hydrophobic profile that defines a six‐transmembrane topology with a putative reentrant loop at its C terminus, positioning both its N and C termini within the cytosol. This topology, shared by other members of the TMBIM family, is crucial for its function since mutations in conserved charged residues can abrogate its anti‐apoptotic activity. Moreover, although TMBIM4 can form pH‐dependent oligomers in membranes, studies demonstrate that its monomeric form retains full function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond apoptosis regulation, TMBIM4 influences cell behavior by enhancing adhesion, spreading, migration, and even three‐dimensional invasion. These effects are mediated through the local modulation of Ca²⁺ influx and the activation of downstream effectors such as calpain, which regulates focal adhesion turnover. Furthermore, TMBIM4 has been implicated in pathogen–host interactions by interacting with bacterial proteins to modulate infection outcomes, and its inclusion within the evolutionarily conserved BI1 family underscores its broader role as a regulator of cell death and intracellular signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Caroline Gubser, Daniele Bergamaschi, Michael Hollinshead, et al. 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