Abstract
RNA topoisomerase activity has recently been detected in multiple Type IA DNA topoisomerases from all three domains of life: bacteria, archaea, and eukarya. Many, but not all, Type IA topoisomerases are found to possess activities for not only DNA, but also RNA, suggesting that they may solve topological problems for both types of nucleic acids. Here we describe a detailed assay used by our group to detect RNA topoisomerase activity for many Type IA topoisomerases. We discuss the strategy, experimental procedures, troubleshooting, and limitations for this assay.
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