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Nucleic Acids Research, 1983, Vol. 11, No. 24 8691-8701
© 1983

ENZYMOLOGY

Mechanistic study of E. coli DNA topoisomerase I: cleavage of oligonucleotides

Y.-C. Tse-Dinh*, B.G.H. McCarron, R. Arentzen and V. Chowdhry

Central Research and Development Department, E.1. du Pont de Nemours and Company Experimental Station, Wilmington, DE 19898, USA

*To whom correspondence should be addressed

Received July 29, 1983. Revised November 15, 1983. Accepted November 15, 1983.

E. coli DNA topoisomerase I catalyzes DNA topoisomerization by transiently breaking and rejoining single DNA strands (1). When an enzyme-DNA incubation mixture is treated with alkaline or detergent, DNA strand cleavage occurs, and the enzyme becomes covalently linked to the 5'-phosphoryl end of the cleaved DNA (2). Using oligonucleotides of defined length and sequence composition, this cleavage reaction is utilized to study the mechanism of E. coli DNA topoisomerase I. dA7 is the shortest oligonucleotide tested that can be cleaved by the enzyme. dT8 is the shortest oligo(dT) that can be cleaved. The site of cleavage in both cases is four nucleotides from the 3' end of the oligonucleotide. No cleavage can be observed for oligo(dC) and oligo(dG) of length up to eleven bases long. dC15 and dC16 are cleaved at one tenth or less the efficiency of oligo(dA) and oligo(dT) of comparable length.


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