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What Does the Brà̧nsted Slope Measure in the Phosphoryl Transfer Transition State? by Lai, Rui; Cui, Qiang is a Chemistry article available to read on EtoBox.

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The structural and energetic features of phosphate and phosphonate hydrolysis in Protein Phosphatase-1 (PP1) and water are studied using quantum mechanical (QM) cluster models. The calculations are able to reproduce observed kinetic isotope effects and capture several key trends in the experimental Brønsted plots: the values are rather different for phosphate and phosphonate ester hydrolysis in solution but are similar in PP1. Detailed analyses of structure, charge distribution and bond order of computed transition states support the general conclusion from experimental study that phosphoryl transfer transition states are different for the two classes of substrates in solution but similar in PP1. On the other hand, the microscopic models also highlight notable differences between the phosphate and phosphonate transition states, which are manifested in not only structure but also kinetic isotope effects. Overall, we find that while generally correlates with the partial charge on leaving group oxygen and the fractional bond order of the breaking P- bond, the precise mapping between and P- bond order in the transition state is difficult due largely to the cross talk between breaking a

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Author

Lai, Rui; Cui, Qiang

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 2155-5435)

Published

2020

Language

EN

Field

Chemistry (Physical Sciences)