Plays an important role in caveolae formation and organization. Required for the sequestration of mobile caveolin into immobile caveolae. Termination of transcription by RNA polymerase I involves pausing of transcription by TTF1, and the dissociation of the transcription complex, releasing pre-rRNA and RNA polymerase I from the template. PTRF is required for dissociation of the ternary transcription complex.
Specificity
Natural and recombinant Mouse Polymerase I and transcript release factor
Subcellular Location
Membrane caveola Cell membrane Microsome Endoplasmic reticulum Cytoplasm cytosol Mitochondrion Nucleus Found at the surface of the caveolae. Also found in the plasma membrane, microsomal and cytosolic fractions and at a low level in the mitochondrial and nuclear fractions (By similarity). Translocates to the cytoplasm from caveolae upon insulin stimulation (By similarity). CAV1 is necessary to recruit it to the cell membrane. Co-localizes with CAV1 in lipid rafts in adipocytes.
Interacts with LIPE in the adipocyte cytoplasm (By similarity). Interacts with RNA polymerase I and TTF1. Binds the 3' end of pre-rRNA. Interacts with transcription factor ZNF148.