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Example sentences for: topoisomerase
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Again the reversal of cleavage was complete for both Top67 and topoisomerase I within seconds after the addition of high salt and Mg 2+even when the reactions were carried out on ice (data not shown) so the lack of relaxation activity by Top67 is unlikely to be due to deficiency in religation.
We further focused our study on MP-release from HUVEC after proapoptotic stimulation with the topoisomerase I inhibitor camptothecin (CPT).
High concentration of DNA substrate is required to favor formation of catenanes catalyzed by topoisomerase I, and the enzyme also has to be present in higher concentration compared to the relaxation reaction.
Previous studies have shown that E. coli DNA topoisomerase I cleavage of single-stranded DNA occurs with selectivity for sites with the C nucleotide base at the - 4 position [ 9 10 ] and that the enzyme preferentially cleaves at junctions of double-stranded and single-stranded DNA [ 8 ] . Several different 5'-end labeled substrates were prepared and used in cleavage assays to compare the cleavage sites selected by Top67 versus topoisomerase I. The results showed that with single-stranded substrates, Top67 also preferred cleavage sites with a C nucleotide base at the -4 position as reported for most of the type IA topoisomerases [ 12 ] . There were some differences from topoisomerase I in the relative distribution of cleavage products among the potential cleavage sites (Figure 4a,4b).
Meiotically induced, Spo11 (Rec12)-dependent double-strand DNA (dsDNA) breaks have been demonstrated in budding yeast and fission yeast [ 12 13 14 15 ] . Spo11 almost certainly catalyzes these breaks, as it shares high homology with the A subunit of Topoisomerase VI of Sulfolobus shibatae [ 16 17 ] and it becomes linked by a phosphotyrosine linkage to the 5' end of the cleaved DNA [ 18 19 20 21 ] . Spo11 homologs have been identified in a wide range of eukaryotes, and available evidence suggests that initiation of meiotic recombination via Spo11-dependent dsDNA break formation is conserved [ 22 23 24 25 ] . Our results with the fission yeast S. pombe fully support this view (see results and discussion).
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