Abstract
In the present work, the RNA polymerase activity of the human mitochondrial RNA polymerase mature protein (h-mtRPOLm) is shown, and its molecular activity calculated (2.1±0.9 min−1). An activity analysis of h-mtRPOLm and deleted versions of it has demonstrated that the entire recombinant protein is required for this activity. In addition, h-mtRPOLm alone or in presence of the known mitochondrial transcription factors (human mitochondrial transcription factor A and/or human mitochondrial transcription termination factor) is not able to initiate transcription from the specific human mitochondrial promoters pointing to the existence of a human mitochondrial transcription factor B-like protein.
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