Abstract
BsoBI is a type II restriction endonuclease belonging to the EcoRI family. There is only one previously published X-ray structure for this endonuclease: it shows a homodimer of BsoBI completely encircling DNA in a tunnel. In this work, molecular dynamics simulations were employed to elucidate possible ways in which DNA is loaded into this complex prior to its cleavage. We found that the dimer does not open spontaneously when DNA is removed from the complex on the timescale of our simulations (~ 0.5 μs). A biased simulation had to be used to facilitate the opening, which revealed a possible way for the two catalytic domains to separate. The α-helices connecting the catalytic and helical domains were found to act as a hinge during the separation. In addition, we found that the opening of the BsoBI dimer was influenced by the type of counterions present in the environment. A reference simulation of the BsoBI/DNA complex further showed spontaneous reorganization of the active sites due to the binding of solvent ions, which led to an active-site structure consistent with other experimental structures of type II restriction endonucleases determined in the presence of metal ions.
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Acknowledgements
This research was carried out under the project CEITEC 2020 (LQ1601) with financial support from the Ministry of Education, Youth and Sports of the Czech Republic under the National Sustainability Programme II. Computational resources were provided by CESNET LM2015042, CERIT Scientific Cloud LM2015085, and the IT4Innovations National Supercomputing Center LM2015070, as provided under the program “Large Infrastructures for Research, Experimental Development and Innovations” by the Ministry of Education, Youth and Sports.
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Dedicated to Dr. Peter Politzer on the occasion of his 80th birthday.
This paper belongs to Topical Collection P. Politzer 80th Birthday Festschrift
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Štěpán, J., Kabelka, I., Koča, J. et al. Behavior of BsoBI endonuclease in the presence and absence of DNA. J Mol Model 24, 22 (2018). https://doi.org/10.1007/s00894-017-3557-8
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DOI: https://doi.org/10.1007/s00894-017-3557-8