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標題: Inhibitor Binding Increases the Mechanical Stability of Staphylococcal Nuclease
作者: Wang, C.C.
Tsong, T.Y.
Hsu, Y.H.
Marszalek, P.E.
Project: Biophysical Journal
期刊/報告no:: Biophysical Journal, Volume 100, Issue 4, Page(s) 1094-1099.
Staphylococcal nuclease (SNase) catalyzes the hydrolysis of DNA and RNA in a calcium-dependent fashion. We used AFM-based single-molecule force spectroscopy to investigate the mechanical stability of SNase alone and in its complex with an SNase inhibitor, deoxythymidine 3`,5`-bisphosphate. We found that the enzyme unfolds in an all-or-none fashion at similar to 26 pN. Upon binding to the inhibitor, the mechanical unfolding forces of the enzyme-inhibitor complex increase to similar to 50 pN. This inhibitor-induced increase in the mechanical stability of the enzyme is consistent with the increased thermodynamical stability of the complex over that of SNase. Because of its strong mechanical response to inhibitor binding, SNase, a model protein folding system, offers a unique opportunity for studying the relationship between enzyme mechanics and catalysis.
ISSN: 0006-3495
DOI: 10.1016/j.bpj.2011.01.011
Appears in Collections:生物科技學研究所

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