{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe sigma‐1 receptor (Sig‐1R) is an unusual endoplasmic reticulum (ER)–resident transmembrane protein whose molecular architecture defies typical receptor families. Recent structural studies have revealed that Sig‐1R adopts a trimeric assembly with each protomer containing a single transmembrane domain and a cupin‐like β‐barrel that forms a large, adaptable hydrophobic ligand–binding cavity. This unique structure underpins its role as a ligand‐operated molecular chaperone that is strategically localized at mitochondrion–associated ER membranes (MAMs) via its association with cholesterol‐ and ceramide–rich microdomains. Moreover, its expression is transcriptionally upregulated during ER stress via the ATF4 pathway, emphasizing its importance in maintaining protein quality control and the unfolded protein response."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its structural uniqueness, Sig‐1R exerts powerful modulatory effects on cellular excitability and calcium signaling through its interactions with numerous ion channels. It binds directly to select subunits of the N‐methyl‑D‑aspartate (NMDA) receptor and participates in the dissociation of inhibitory proteins from inositol 1,4,5‐trisphosphate receptors, thereby facilitating enhanced Ca²⁺ release from ER stores. In addition, Sig‐1R interacts with channels such as TRPV1, voltage–gated sodium channels (including Nav1.5) and several types of potassium channels (for example, hERG and Kv1.3), with its oligomerization state being modulated by specific agonists or antagonists. These interactions collectively impact cellular calcium dynamics, synaptic transmission and excitability in both neurons and cancer cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic mutations and deregulated expression of Sig‐1R have been linked to a broad spectrum of human diseases. Familial mutations in SIGMAR1 have been associated with juvenile amyotrophic lateral sclerosis (ALS) and distal hereditary motor neuropathies, while its altered function is implicated in frontotemporal lobar degeneration and Alzheimer’s disease. Loss of Sig‐1R function disrupts MAM integrity and impairs Ca²⁺ homeostasis, leading to aberrant ER morphology, defective autophagy, and accumulation of misfolded proteins—all of which contribute to neurodegeneration. Furthermore, elevated expression of Sig‐1R in various cancers correlates with enhanced cell proliferation, altered ion channel expression, and changes in hormone receptor regulation (for example, androgen receptor stability in prostate cancer), highlighting its multifaceted role in both neuronal survival and tumor biology. Sig‐1R also appears to influence cellular redox status and apoptotic signaling, notably via its interactions with proteins such as IL‑24 and regulators of GAP activity, thereby modulating diverse aspects of cell fate."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "36"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its roles in protein quality control and ion channel regulation, Sig‐1R modulates broader cell signaling pathways that impact inflammatory responses, nociception, and even viral replication. It has been implicated in the regulation of Ca²⁺ dynamics in endothelial and immune cells, contributing to neuroinflammatory processes and pain transduction. Moreover, emerging evidence indicates that Sig‐1R participates in the early steps of certain viral replication cycles by coordinating lipid trafficking at the ER, underscoring its appeal as a therapeutic target across diverse pathological conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "37", "end_ref": "39"}, {"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hayden R Schmidt, Sanduo Zheng, Esin Gurpinar, et al. 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