Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2018;1703:1-20.
doi: 10.1007/978-1-4939-7459-7_1.

Type IA DNA Topoisomerases: A Universal Core and Multiple Activities


Type IA DNA Topoisomerases: A Universal Core and Multiple Activities

Florence Garnier et al. Methods Mol Biol. .


All the type IA topoisomerases display universal characteristics relying on a core region basically responsible for the transesterification and the strand passage reaction. First limited to the bacterial domain for a long time, these enzymes were further retrieved in Archaea and Eukarya as well. This is representative of an extremely ancient origin, probably due to an inheritance from the RNA world. As remaining evidence, some current topoisomerases IA have retained a RNA topoisomerase activity. Despite the presence of this core region in all of these TopoIAs, some differences exist and are originated from variable regions, located essentially within both extremities, conferring on them their specificities. During the last 2 decades the evidence of multiple activities and dedicated roles highlighted the importance of the topoisomerases IA. It is now obvious that topoisomerases IA are key enzymes involved in the maintenance of the genome stability. The discovery of these new activities was done thanks to the use of more accurate assays, based on new sophisticated DNA substrates.

Keywords: Reverse gyrase; Topoisomerase I; Topoisomerase III; Topoisomerases; Type 1A; topA; topB; toprim.

Similar articles

See all similar articles

Cited by 6 articles

See all "Cited by" articles


LinkOut - more resources