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Reference: Classen S, et al. (2003) Structure of the topoisomerase II ATPase region and its mechanism of inhibition by the chemotherapeutic agent ICRF-187. Proc Natl Acad Sci U S A 100(19):10629-34

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Abstract


Type IIA topoisomerases both manage the topological state of chromosomal DNA and are the targets of a variety of clinical agents. Bisdioxopiperazines are anticancer agents that associate with ATP-bound eukaryotic topoisomerase II (topo II) and convert the enzyme into an inactive, salt-stable clamp around DNA. To better understand both topo II and bisdioxopiperazine function, we determined the structures of the adenosine 5'-[beta,gamma-imino]-triphosphate-bound yeast topo II ATPase region (ScT2-ATPase) alone and complexed with the bisdioxopiperazine ICRF-187. The drug-free form of the protein is similar in overall fold to the equivalent region of bacterial gyrase but unexpectedly displays significant conformational differences. The ternary drug-bound complex reveals that ICRF-187 acts by an unusual mechanism of inhibition in which the drug does not compete for the ATP-binding pocket, but bridges and stabilizes a transient dimer interface between two ATPase protomers. Our data explain why bisdioxopiperazines target ATP-bound topo II, provide a structural rationale for the effects of certain drug-resistance mutations, and point to regions of bisdioxopiperazines that might be modified to improve or alter drug specificity.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
Authors
Classen S, Olland S, Berger JM
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