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Dimerization ability, denaturation mechanism, and the stability of a staphylococcal phage repressor and its two domains.
International Journal of Biological Macromolecules 2018 December 3
The lysogenic growth of phage ф11 in Staphylococcus aureus is controlled by a repressor (CI) that harbors an N-terminal domain (NTD), and a C-terminal domain (CTD). Previously, NTD, like CI, showed DNA binding activity and dimerized in the aqueous solution. To precisely understand the folding mechanism, function, and the stability of CI, NTD, and CTD, we have investigated their recombinant forms, rCI, rNTD, and rCTD, using various probes. The data reveal that rCTD, like rCI and rNTD, is a well-structured protein and produces dimers in the aqueous environment. However, the stability order of the dimers appears to be rCI > rCTD > rNTD. Interestingly, the stability of rNTD or rCTD looks slightly higher than that of rCI. The urea-induced equilibrium unfolding of these proteins proceeded via the production of two intermediates. The structure, surface hydrophobicity, and the dimeric status of one intermediate mostly differed from those of another intermediate or the native protein. Our MD simulation study on the representative NTD shows the substantial change in its structure and stability at the urea concentrations, which formed rNTD intermediates. Collectively, the computational data have supported the experimental data and indicated that the CI and its domains are folded by a similar multiphasic pathway.
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