Reduction mechanism in class A methionine sulfoxide reductases: a theoretical chemistry investigation View Full Text


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Article Info

DATE

2011-05

AUTHORS

E. Thiriot, G. Monard, S. Boschi-Muller, G. Branlant, M. F. Ruiz-López

ABSTRACT

Ab initio calculations at the B3LYP/6–311 ++G(2df,2p) and B3LYP/6–31G(d) level have been carried out to investigate the reaction mechanism of methionine sulfoxide reductases of class A. These enzymes reduce oxidized methionine in vivo and therefore play an important role in repairing protein damage caused by the oxidative stress. Our calculations have been carried out for a model reaction in a model active site. Several reaction mechanisms have been explored that can roughly be described as (2H+ + 2e−) or (H+ + e−). The results suggest that the actual reaction mechanism is of the (2H+ + 2e−) type corresponding to a more or less asynchronous-concerted double-proton transfer reaction leading to the formation of methionine (dimethylthioether in our model) and a sulfenic acid Cys-SOH. The Michaelis complex would involve one deprotonated Cys and one protonated Glu residues in the active site, this protonation state being mandatory to stabilize the sulfoxide substrate. Then, proton transfer from Glu to the substrate takes place, followed by proton transfer from one Tyr residue and fast reorganization of the system. The overall activation energy barrier is estimated to fall in the range 7–9 kcal/mol, much lower than the predicted barrier in DMSO solution (29.6 kcal/mol) reported before. More... »

PAGES

93-103

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00214-011-0901-4

DOI

http://dx.doi.org/10.1007/s00214-011-0901-4

DIMENSIONS

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53 schema:description Ab initio calculations at the B3LYP/6–311 ++G(2df,2p) and B3LYP/6–31G(d) level have been carried out to investigate the reaction mechanism of methionine sulfoxide reductases of class A. These enzymes reduce oxidized methionine in vivo and therefore play an important role in repairing protein damage caused by the oxidative stress. Our calculations have been carried out for a model reaction in a model active site. Several reaction mechanisms have been explored that can roughly be described as (2H+ + 2e−) or (H+ + e−). The results suggest that the actual reaction mechanism is of the (2H+ + 2e−) type corresponding to a more or less asynchronous-concerted double-proton transfer reaction leading to the formation of methionine (dimethylthioether in our model) and a sulfenic acid Cys-SOH. The Michaelis complex would involve one deprotonated Cys and one protonated Glu residues in the active site, this protonation state being mandatory to stabilize the sulfoxide substrate. Then, proton transfer from Glu to the substrate takes place, followed by proton transfer from one Tyr residue and fast reorganization of the system. The overall activation energy barrier is estimated to fall in the range 7–9 kcal/mol, much lower than the predicted barrier in DMSO solution (29.6 kcal/mol) reported before.
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