Enables DNA topoisomerase type I (single strand cut, ATP-independent) activity and chromatin DNA binding activity. Involved in several processes, including cellular response to luteinizing hormone stimulus; nucleic acid metabolic process; and response to gamma radiation. Located in dense fibrillar component and fibrillar center. Orthologous to human TOP1 (DNA topoisomerase I). [provided by Alliance of Genome Resources, Apr 2022]