Journal article


Aeromonas proteolytica aminopeptidase: An investigation of the mode of action using a quantum mechanical/molecular mechanical approach


Publication Details
Author(s): Schürer G, Lanig H, Clark T
Journal: Biochemistry
Publisher: American Chemical Society
Publication year: 2004
Volume: 43
Journal issue: 18
Pages range: 5414-5427
ISSN: 0006-2960

Abstract

The aminopeptidase of Aeromonas proteolytica (AAP) belongs to the group of metallo-hydrolases that require two divalent cations for full activity. Such binuclear metal centers are found in several aminopeptidases, raising the question whether a common mechanism, at least partly, is likely. We have used a quantum mechanical/molecular mechanical (QM/MM) approach to investigate the reaction mechanism of AAP. Among several possibilities, one reaction path was found to be clearly the most favorable. Beside the chemical transformation steps, effects of the enzyme environment and the influence of the solvent on the catalytic reaction were included in the study. The results are in good agreement with experimental studies and correspond to a high degree to our previous QM/MM calculations on the reaction mechanism of the related binuclear bovine lens leucine aminopeptidase (blLAP), which, although related to the AAP, has different Zn2+-coordination spheres and a different catalytic residue. The mechanisms of the two enzymes as suggested in the literature differ on the mode of coordination of the nucleophile and the identity of the general base. However, the results of this and our previous work on blLAP allow us to identify a common mechanism for the two enzymes. This mechanism is probably quite general for binuclear zinc enzymes.



How to cite
APA: Schürer, G., Lanig, H., & Clark, T. (2004). Aeromonas proteolytica aminopeptidase: An investigation of the mode of action using a quantum mechanical/molecular mechanical approach. Biochemistry, 43(18), 5414-5427. https://dx.doi.org/10.1021/bi0340191

MLA: Schürer, Gudrun, Harald Lanig, and Timothy Clark. "Aeromonas proteolytica aminopeptidase: An investigation of the mode of action using a quantum mechanical/molecular mechanical approach." Biochemistry 43.18 (2004): 5414-5427.

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