Abstract
Manganese superoxide dismutase from Staphylococcus equorum (MnSODSeq) maintains its activity upon treatments like a wide range of pH, addition of detergent and denaturing agent, exposure to ultraviolet light, and heating up to 50 °C. The enzyme dimer dissociates at 52–55 °C, while its monomer unfolds at 63–67 °C. MnSOD dimeric form is indispensable for the enzyme activity; therefore, strengthening the interactions between the monomers is the most preferred strategy to improve the enzyme stability. However, to date, modification of MnSODSeq at the dimer interface has been unfruitful despite excluding the inner and outer sphere regions that are important to the enzyme activity. Here, a new strategy was developed and K38R-A121E/Y double substitutions were proposed. These mutants displayed similar enzyme activity to the wild type. K38R-A121E dimer was thermally more stable and its monomer stability was similar to the wild type. The thermal stability of K38R-A121Y dimer was similar to the wild type but its monomer was thermally less stable. In addition, the structure of the previously reported L169W mutant was also elucidated. The L169W mutant structure showed that intramolecular modification can decrease flexibility of the MnSODSeq monomer and leads to a less stable enzyme with similar activity to the wild type. Thus, while the enzyme activity depends on arrangement of residues in the dimer interface, the stability appears to depend more on its monomeric architecture. Furthermore, in the L169W structure in complex with azide, which is a specific inhibitor for MnSOD, one of the azide molecules was present in the dimer interface region that previously has been identified to involve in the enzymatic reaction. Nevertheless, the present results show that an MnSODSeq mutant with better thermal stability has been obtained.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding
The work has been supported by The World Class Research program, Ministry of Research, Technology and Higher Education (2020), by Dexa Medica, and by Department of Basic Life Science, Faculty of Medicine, Kagawa University. We thank the staffs of the Photon Factory (KEK, Tsukuba, Japan) for the support of data collection.
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DSR: conceptualization, funding acquisition; HY: methodology, formal analysis and investigation, manuscript review and editing; IP: formal analysis and investigation, original draft preparation; RM: formal analysis and investigation, original draft preparation; RAU: methodology, manuscript review and editing, supervision; AA: methodology, manuscript review and editing, funding acquisition, supervision; WTI: methodology, original draft preparation, manuscript review and editing, supervision.
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Debbie S. Retnoningrum deceased during completion of the works.
This manuscript is dedicated to D. Retnoningrum, who had initiated the works on MnSOD from S. equorum in Indonesia.
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Retnoningrum, D.S., Yoshida, H., Pajatiwi, I. et al. Introducing Intermolecular Interaction to Strengthen the Stability of MnSOD Dimer. Appl Biochem Biotechnol 195, 4537–4551 (2023). https://doi.org/10.1007/s12010-023-04347-7
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DOI: https://doi.org/10.1007/s12010-023-04347-7