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• W4309476146 abstract "In contrast to bacterial, yeast and animal systems, topoisomerases (topo) from plants have not been well studied. In this report, we generated four truncated topoisomerase II (Topo II) cDNA fragments encoding different functional domains of Nicotiana tabacum topo II (NtTopoII). Each of these recombinant polypeptides was expressed alone or in combination in temperature-sensitive topoisomerase II yeast mutants. Recombinant NtTopoII with truncated polypeptides fails to target the yeast nuclei and does not rescue the temperature-sensitive phenotype. In contrast complementation was achieved with the full-length NtTopoII, which localized to the yeast nucleus. These observations suggested the presence of a potent nuclear localization signal (NLS) in the extreme C-terminal 314 amino acid residues of NtTopoII that functioned effectively in the heterologous yeast system. Biochemical characterization of purified recombinant full-length and the partial NtTopoII polypeptides revealed that the ATP-binding and hydrolysis region of NtTopoIIwas located at 413 amino acid N-terminal region and this ATPase domain is functional both when it is expressed as a separate polypeptide or as part of the holoenzyme. The present findings also revealed that all NtTopoII truncated polypeptides were detrimental for in vitro supercoiled DNA relaxation and/or DNA nicking and ligation activity. Further, we discuss the possible disruption of coordinated macromolecular interface movements and the dimer interactions in truncated NtTopoII that are required for functional topoisomerase activity." @default.
• W4309476146 created "2022-11-28" @default.
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• W4309476146 date "2023-01-01" @default.
• W4309476146 modified "2023-09-27" @default.
• W4309476146 title "Expression and functional analysis of various structural domains of tobacco topoisomerase II: To understand the mechanistic insights of plant type II topoisomerases" @default.
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• W4309476146 doi "https://doi.org/10.1016/j.plaphy.2022.11.019" @default.
• W4309476146 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36442361" @default.
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