Caveolae-associated protein 1 (CAVIN1)

Caveolae-associated protein 1 (CAVIN1, also known as polymerase I and transcript release factor or PTRF) is a **structural protein essential for the formation and stabilization of caveolae**, which are small, flask-shaped invaginations in the plasma membrane found in many tissue types, especially adipocytes, muscle, and endothelial cells[1][2][3]. CAVIN1 forms oligomeric complexes with caveolins (most significantly caveolin-1) and other cavins, acting as a scaffolding factor that organizes caveolar architecture and is required for their biogenesis[2][3]. Besides its structural role, CAVIN1 relocates to the nucleus under certain conditions and functions as a **transcription termination factor** (PTRF) for RNA polymerase I, regulating ribosomal RNA synthesis[3]. Pathogenic mutations in CAVIN1 cause congenital generalized lipodystrophy type 4, characterized by near-total loss of adipose tissue, muscular and metabolic defects, and sometimes cardiac involvement[1][3]. CAVIN1 is also implicated in regulating lipid and glucose metabolism, intracellular signaling pathways, and membrane trafficking. The protein is not a classic receptor, enzyme, or ion channel, but disruption of CAVIN1/caveolae structure can alter cellular responses to injury, metabolic stress, and disease. CAVIN1 is an actionable molecular target and biomarker in rare metabolic disease and potentially for modulating cell membrane dynamics, but as of now, no drugs are clinically directed at this target[1][3].

Other names

PTRFPolymerase I and transcript release factorcavin-1CGL4FKSG13TTF-I interacting peptide 12