Endoplasmic reticulum lipid raft-associated protein 1 (ERLIN1)

Endoplasmic reticulum lipid raft-associated protein 1 (ERLIN1) is an ER-resident transmembrane protein belonging to the SPFH (stomatin-prohibitin-flotillin-HflC/K) domain family, where it forms a heterooligomeric complex with ERLIN2[2][3]. Localized to cholesterol-rich, detergent-resistant "lipid rafts" in the ER membrane and at mitochondria-associated ER membranes (MAMs), ERLIN1 supports the assembly of specialized protein-lipid microdomains[1][2]. Functionally, ERLIN1 is involved in the ER-associated degradation (ERAD) of activated inositol 1,4,5-trisphosphate receptors, regulates cellular cholesterol balance via interaction with SREBP pathway factors, and participates in lipid metabolic control. Its activity impacts intracellular calcium homeostasis, autophagy (via interaction with autophagic regulators including AMBRA1), and cellular responses to ER stress[2]. ERLIN1 dysfunction by mutation is causally linked to the neurodegenerative disorder spastic paraplegia 62 and has been associated with juvenile amyotrophic lateral sclerosis and liver disease susceptibility[1][3]. It has also been studied as a host factor for hepatitis C virus replication and as an estrogen-responsive gene in breast cancer models[1]. ERLIN1 is not currently recognized as a therapeutic target with approved drugs but is an important emerging focal point for research on ER function, membrane organization, and related diseases.

Other names

Erlin-1C10orf69KE04KEO4SPFH1Stomatin-prohibitin-flotillin-HflC/K domain-containing protein 1Band_7 23-211 Keo4 (Interim) similar to C.elegans protein C42C1.9SPG62Protein KE04SPFH domain-containing protein 1Endoplasmic reticulum lipid raft-associated protein 1

Not applicable for approved drugs; potential mechanisms for research molecules involve modulation of protein-protein interactions or ERAD targeting[1].