Chromatographic isolation of the functionally active MutS protein covalently linked to deoxyribonucleic acid

Journal of Chromatography. a
Mayya MonakhovaElena Kubareva

Abstract

DNA metabolism is based on formation of different DNA-protein complexes which can adopt various conformations. To characterize functioning of such complexes, one needs a solution-based technique which allows fixing a complex in a certain transient conformation. The crosslinking approach is a popular tool for such studies. However, it is under debate if the protein components retain their natural activities in the resulting crosslinked complexes. In the present work we demonstrate the possibility of obtaining pure DNA conjugate with functionally active protein using as example MutS protein from Escherichia coli mismatch repair system. A conjugate of a chemically modified mismatch-containing DNA duplex with MutS is fixed by thiol-disulfide exchange reaction. To perform a reliable test of the protein activity in the conjugate, such conjugate must be thoroughly separated from the uncrosslinked protein and DNA prior to the test. In the present work, we employ anion exchange chromatography for this purpose for the first time and demonstrate this technique to be optimal for the conjugate purification. The activity test is a FRET-based detection of DNA unbending. We show experimentally that MutS in the conjugate retains its ability to ...Continue Reading

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Jul 31, 2014·European Journal of Cell Biology·Daan VisserKees Jalink
Oct 3, 2018·Nucleic Acids Research·Sharonda J LeBlancDorothy A Erie
Oct 9, 2020·Evidence-based Complementary and Alternative Medicine : ECAM·Han-Qing PangJin-Ao Duan
Apr 7, 2021·Nature Structural & Molecular Biology·Rafael Fernandez-LeiroMeindert H Lamers
May 4, 2021·Russian Journal of Bioorganic Chemistry·V G Metelev, T S Oretskaya

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