Chemical Mapping Exposes the Importance of Active Site Interactions in Governing the Temperature Dependence of Enzyme Turnover

Samuel D. Winter, Hannah B. L. Jones, Dora M. Răsădean, Rory M. Crean, Michael J. Danson, G. Dan Pantos, Gergely Katona, Erica Prentice, Vickery L. Arcus, Marc W. van der Kamp, Christopher R. Pudney

Research output: Contribution to journalArticlepeer-review

Abstract

Uncovering the role of global protein dynamics in enzyme turnover is needed to fully understand enzyme catalysis. Recently, we have demonstrated that the heat capacity of catalysis, ΔCP‡, can reveal links between the protein free energy landscape, global protein dynamics, and enzyme turnover, suggesting that subtle changes in molecular interactions at the active site can affect long-range protein dynamics and link to enzyme temperature activity. Here, we use a model promiscuous enzyme (glucose dehydrogenase from Sulfolobus solfataricus) to chemically map how individual substrate interactions affect the temperature dependence of enzyme activity and the network of motions throughout the protein. Utilizing a combination of kinetics, red edge excitation shift (REES) spectroscopy, and computational simulation, we explore the complex relationship between enzyme–substrate interactions and the global dynamics of the protein. We find that changes in ΔCP‡ and protein dynamics can be mapped to specific substrate–enzyme interactions. Our study reveals how subtle changes in substrate binding affect global changes in motion and flexibility extending throughout the protein.
Original languageEnglish
Pages (from-to)14854-14863
Number of pages10
JournalACS Catalysis
Volume11
Early online date29 Nov 2021
DOIs
Publication statusE-pub ahead of print - 29 Nov 2021

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