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- W2085741680 abstract "Folding enzymes often use distinct domains for the interaction with a folding protein chain and for the catalysis of intrinsically slow reactions such as prolyl cis/trans isomerization. Here, we investigated the refolding reaction of ribonuclease T1 in the presence of the prolyl isomerase SlyD from Escherichia coli to examine how this enzyme catalyzes the folding of molecules with an incorrect trans proline isomer and how it modulates the conformational folding of the molecules with the correct cis proline. The kinetic analysis suggests that prolyl cis → trans isomerization in the SlyD-bound state shows a rate near 100 s(-1) and is thus more than 10(4)-fold accelerated, relative to the uncatalyzed reaction. As a consequence of its fast binding and efficient catalysis, SlyD retards the conformational folding of the protein molecules with the correct cis isomer, because it promotes the formation of the species with the incorrect trans isomer. In the presence of ≥1 μM SlyD, protein molecules with cis and trans prolyl isomers refold with identical rates, because SlyD-catalyzed cis/trans equilibration is faster than conformational folding. The cis or trans state of a particular proline is thus no longer a determinant for the rate of folding." @default.
- W2085741680 created "2016-06-24" @default.
- W2085741680 creator A5004538725 @default.
- W2085741680 creator A5037535322 @default.
- W2085741680 creator A5068174291 @default.
- W2085741680 date "2013-03-11" @default.
- W2085741680 modified "2023-10-18" @default.
- W2085741680 title "The Prolyl Isomerase SlyD Is a Highly Efficient Enzyme but Decelerates the Conformational Folding of a Client Protein" @default.
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- W2085741680 doi "https://doi.org/10.1021/ja311775a" @default.
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