Function: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. ,PTM:Five truncated forms are found in the caveolae. These are thought to be the result of proteolysis and may be phosphorylation-dependent. ,PTM:Phosphorylated. Present in active and inactive forms. Changes in phosphorylation pattern may alter activity. ,similarity:Belongs to the PTRF/SDPR family. ,subcellular location: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. Translocates to the cytoplasm from the caveolae upon insulin stimulation. ,subunit:Interacts with RNA polymerase I and TTF1. Binds the 3' end of pre-rRNA. Interacts with transcription factor ZNF148 (By similarity) . Interacts with LIPE in the adipocyte cytoplasm. ,
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