TY - CHAP M1 - Book, Section TI - Topoisomerase Inhibitors: Camptothecins, Anthracyclines, and Etoposide A1 - Chabner, Bruce A. A2 - Chabner, Bruce A. A2 - Longo, Dan L. Y1 - 2016 N1 - T2 - Harrison's Manual of Oncology, 2e AB - Topoisomerases carry out the important function of unwinding DNA by creating temporary breaks in DNA, promoting passage of single strands of DNA through breaks, and then resealing the breaks. This function is critical in allowing access of repair and replication complexes to linear strands of DNA. Similar enzymes are found throughout the eukaryotic and prokaryotic world, a testament to their essential function. Likewise, they are one of the most common targets of naturally occurring poisons. Two classes of topoisomerases (topos) are found in human cells: topo I does not require ATP for strand breakage and resealing, and creates single strand breaks, while the several isoforms of topo II require ATP and create double strand breaks. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - hemonc.mhmedical.com/content.aspx?aid=1127646436 ER -