Small G protein signaling modulator 1 (SGSM1)

Small G protein signaling modulator 1 (SGSM1) is a cytosolic and cytoplasmic vesicle-associated protein primarily expressed in the central nervous system, containing RUN and TBC1 domains[1][2][7]. SGSM1 functions as a modulator of small GTPase signaling, acting as both an effector and GTPase activator for various members of the Rab and Rap family of small G proteins, particularly promoting GTP hydrolysis by RAB34 and RAB36, but not RAB9A and RAB9B[1][7][2]. It is involved in intracellular signal transduction and vesicular trafficking, and influences pathways such as positive regulation of transcription by RNA polymerase II[1][2]. Mutations or genetic variation in SGSM1 have been associated with certain neurodegenerative disorders, but it is not currently established as a direct therapeutic target[1]. The canonical gene and protein name, as defined in gene/protein databases, is "Small G protein signaling modulator 1," with SGSM1 as its widely accepted abbreviation[1][2][4]. The primary molecular features are the RUN and TBC1 domains, placing it in the broad "Other" molecular classification; these domains relate to small GTPase regulatory mechanisms, but SGSM1 is not an enzyme, traditional receptor, transporter, or channel[2][7][10]. SGSM1 is a cytosolic protein involved in vesicle transport through Rab and Rap GTPase pathways, contributing to membrane trafficking necessary for neuronal and other cellular functions[1][2][7]. There is no evidence in the provided data or current research databases of direct drug interactions, biomarker status, therapeutic mechanism, or safety issues—nor is it currently a typical small-molecule drug target[1][2][4]. Genetic mutations in SGSM1 have been associated with rare inherited neurological disorders such as autosomal dominant adult-onset proximal spinal muscular atrophy and autosomal recessive spastic paraplegia 57[1]. Aliases are consistent across major genomic and protein resources and include all names listed in the query[1][2][4]. No evidence of misspelling, incorrectness, or inappropriateness as a protein/gene target (SGSM1 is a valid, well-characterized protein-coding gene)[1][2][4][9].

Other names

Small G protein signaling modulator 1SGSM1KIAA1941RUTBC2RUN and TBC1 domain-containing protein 2RUN and TBC1 domain containing 2small G protein signaling modulator 1 proteinnurr1-interacting protein (NuIP)