Words similar to topoisomerase
Example sentences for: topoisomerase
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Although direct evidence that autoantigen cleavage fragments produced during cell death elicit autoantibody responses is still scarce, Pollard et al . reported that immunization of B10.S mice (H-2 s) with a 19 kDa proteolytic cleavage fragment of fibrillarin (derived from nonapoptotic cell death) elicited antibodies that are comparable with human anti-fibrillarin autoantibodies and those derived from mice exposed to mercury [ 40 ] . In a study using human sera, Greidinger et al . reported that the recognition of apoptosis-derived and oxidatively modified forms of the 70 kDa subunit of U1 small nuclear ribonucleoprotein autoantigen was associated with distinct disease manifestations [ 41 ] . Furthermore, Oriss et al . demonstrated that a combination of antigen-processing cells and a fragment of DNA topoisomerase I efficiently elicited autoreactive T-cell proliferation, whereas the full-length topoisomerase I required additional stimulus of exogenous interleukin-2 [ 42 ] .
The cleavage assays were carried out with 1 pmole of 5' 32P-end labeled DNA substrate and 5-10 pmoles of topoisomerase I or Top67 in 10 μl of the buffer used for the gel mobility shift assay.
There are two homologous type IA topoisomerases present in E. coli . Topoisomerase III has potent DNA decatenating activity for resolution of plasmid DNA replication intermediates, but much weaker relaxation activity than topoisomerase I [ 17 ] . To exhibit maximal relaxation activity, topoisomerase III requires high temperature (52°C) along with low magnesium and monovalent ion [ 17 18 ] . In contrast, E. coli topoisomerase I was not active in the in vitro assay for resolution of plasmid DNA replication intermediates [ 19 ] . Removal of the C-terminal 49 amino acids from the 653 amino acid topoisomerase III protein resulted in drastic reduction of catalytic activity [ 20 ] . Fusion of the carboxyl-terminal 312 amino acid residues of E. coli topoisomerase I, which includes the entire ZD domain, onto the 605 N-terminal amino acids of topoisomerase III generated a hybrid topoisomerase that has relaxation activity resembling topoisomerase III along with weak decatenating activity [ 21 ] . Although preferring single-stranded DNA as binding substrate, topoisomerase I had been shown to also bind double-stranded DNA [ 22 ] , but there is no data available to indicate which domain in the enzyme is responsible for this interaction.
We used CPT, an inhibitor of topoisomerase I, that is a well defined apoptogenic agent belonging to a promising class of antineoplastic drugs [ 23 ] . In contrast to more physiological stimuli (i.e, oxidative stress) induction of apoptosis by CPT is less complex and thus is a better model for study of MP-release phenomenon.
1) selected from it for resistance to the topoisomerase 1-inhibitor 9-nitro-camptothecin.
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