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J Biol Chem, Vol. 274, Issue 31, 21688-21694, July 30, 1999

Catalysis of ATP Hydrolysis by Two NH2-terminal Fragments of Yeast DNA Topoisomerase II

Stephane Olland and James C. Wang

From the Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138

Catalysis of ATP hydrolysis by two NH2-terminal fragments of yeast DNA topoisomerase II was studied in the absence and presence of DNA, and in the absence and presence of inhibitor ICRF-193. The results indicate that purified Top2-(1-409), a fragment containing the NH2-terminal 409 amino acids of the yeast enzyme, is predominantly monomeric, with a low level of ATPase owing to weak association of two monomers to form a catalytically active dimer. The ATPase activity of Top2-(1-409) is independent of DNA in a buffer containing 100 mM NaCl, in which intact yeast DNA topoisomerase II exhibits robust DNA-dependent ATPase and DNA transport activities. Purified Top2-(1-660), a fragment containing the NH2-terminal 660 amino acid of the yeast enzyme, appears to be dimeric in the absence or presence of DNA, and the ATPase activity of the protein is significantly stimulated by DNA. These results are consistent with a model in which binding of an intact DNA topoisomerase II to DNA places the various subfragments of the enzyme in a way that makes the intramolecular dimerization of the ATPase domains more favorable. We believe that this alignment of subfragments is mainly achieved through the binding of the enzyme to the DNA segment within which the enzyme makes transient breaks. The ATPase activity of Top2-(1-409) is inhibited by ICRF-193, suggesting that the bisdioxopiperazine class of DNA topoisomerase II inhibitors directly interacts with the paired ATPase domains of the enzyme.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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