Abstract
Nicking endonucleases (NEs) are a small, poorly studied family of restriction endonucleases. The enzymes recognize a target sequence in DNA, but catalyze the hydrolysis of only one strand. The mechanism of their action is important to study because NEs with new specificities are necessary to design to solve the practical tasks of biotechnology. One of the modern approaches for investigation of protein-nucleic acid interactions is fluorescence spectroscopy, which involves the introduction of fluorophores into proteins, mainly through Cys residues due to the high reactivity of their thiol group. To implement this approach, it is necessary to clarify the role of Cys residues in the functioning of the native protein and the possible consequences of their modification. Crosslinking was used to study whether Cys residues are close to DNA in the complex with NE BspD6I. Reactions were carried out using the wild-type enzyme, its mutant form NE BspD6I(C11S/C160S), and modified DNA duplexes containing the 2-pyridyldisulfide group at the C2' atom of the sugar-phosphate moiety in different positions of the oligonucleotide strand. The Cys residues of NE BspD6I were for the first time shown to be in close proximity to DNA during the binding process, including the step of a nonspecific complex formation. The substitutions C11S and C160S in the N-terminal domain of the enzyme slightly decreased the efficiency of substrate hydrolysis. Construction of a cysteine-free NE BspD6I variant and examination of its properties will provide additional information about the functional significance of the Cys residues for this unique enzyme.
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ACKNOWLEDGMENTS
We are grateful to T.S. Zatsepin (Skolkovo Institute of Science and Technologies, Moscow) for the oligodeoxyribonucleotides carrying the 2'-amino group and M.V. Mona-khova (Belozersky Institute of Physico-Сhemical Biology, Lomonosov Moscow State University) for the MutS preparation.
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This work was supported by the Russian Science Foundation (project no. 18-74-00049).
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This work does not contain any studies involving animals or human subjects performed by any of the authors.
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Translated by T. Tkacheva
Abbreviations: dsDNA, double-stranded DNA; CD, circular dichroism; NE, nicking endonuclease; PAGE, polyacrylamide gel electrophoresis; RE, restriction endonuclease; FAM, carboxyfluorescein; PEG-Mal, polyethylene glycol maleimide; SPDP, succinimidyl 3-(2-pyridyldithio)propionate.
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Abrosimova, L.A., Samsonova, A.R., Perevyazova, T.A. et al. The Role of Cysteine Residues in the Interaction of Nicking Endonuclease BspD6I with DNA. Mol Biol 54, 599–610 (2020). https://doi.org/10.1134/S0026893320040020
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DOI: https://doi.org/10.1134/S0026893320040020