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Conformational sampling and kinetics changes across a non-Arrhenius break point in the enzyme thermolysin.


ABSTRACT: Numerous studies have suggested a significant role that protein dynamics play in optimizing enzyme catalysis, and changes in conformational sampling offer a window to explore this role. Thermolysin from Bacillus thermoproteolyticus rokko, which is a heat-stable zinc metalloproteinase, serves here as a model system to study changes of protein function and conformational sampling across a temperature range of 16-36?°C. The temperature dependence of kinetics of thermolysin showed a biphasic transition at 26?°C that points to potential conformational and dynamic differences across this temperature. The non-Arrhenius behavior observed resembled results from previous studies of a thermophilic alcohol dehydrogenase enzyme, which also indicated a biphasic transition at ambient temperatures. To explore the non-Arrhenius behavior of thermolysin, room temperature crystallography was applied to characterize structural changes in a temperature range across the biphasic transition temperature. The alternate conformation of side chain fitting to electron density of a group of residues showed a higher variability in the temperature range from 26 to 29?°C, which indicated a change in conformational sampling that correlated with the non-Arrhenius break point.

SUBMITTER: Dong M 

PROVIDER: S-EPMC7021514 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Conformational sampling and kinetics changes across a non-Arrhenius break point in the enzyme thermolysin.

Dong Ming M   Lauro Mackenzie L ML   Koblish Timothy J TJ   Bahnson Brian J BJ  

Structural dynamics (Melville, N.Y.) 20200101 1


Numerous studies have suggested a significant role that protein dynamics play in optimizing enzyme catalysis, and changes in conformational sampling offer a window to explore this role. Thermolysin from <i>Bacillus thermoproteolyticus rokko</i>, which is a heat-stable zinc metalloproteinase, serves here as a model system to study changes of protein function and conformational sampling across a temperature range of 16-36 °C. The temperature dependence of kinetics of thermolysin showed a biphasic  ...[more]

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