Håkan Carlsson
Överbibliotekarie
Computational modeling of the mechanism of urease.
Författare
Summary, in English
In order to elucidate aspects of the mechanism of the hydrolytic enzyme urease, theoretical calculations were undertaken on a model of the active site, using density functional theory. The bridging oxygen donor that has been found in the crystal structures was determined to be a hydroxide ion. The initial coordination of urea at the active site occurs most likely through the urea oxygen to the nickel ion with the lowest coordination number. This coordination can be made without much gain in energy. The calculations also showed that weak coordination of one of the urea amine nitrogen atoms to the second nickel atom is energetically feasible. Furthermore, a proposed mechanism including a tetrahedral intermediate generated by hydrolytic attack on the urea carbon by the bridging hydroxide was modeled, and the tetrahedral intermediate was found to be energetically unfavorable relative to terminal coordination of the substrate (urea).
Avdelning/ar
- Kemiska institutionen
- Kemisk fysik
Publiceringsår
2010
Språk
Engelska
Publikation/Tidskrift/Serie
Bioinorganic Chemistry and Applications
Volym
2010
Dokumenttyp
Artikel i tidskrift
Förlag
Hindawi Limited
Ämne
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1687-479X