Structure of isochorismate synthase in complex with magnesium.

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TitleStructure of isochorismate synthase in complex with magnesium.
Publication TypeJournal Article
Year of Publication2008
AuthorsParsons, JF, Shi, KM, Ladner, JE
JournalActa Crystallogr D Biol Crystallogr
Volume64
IssuePt 5
Pagination607-10
Date Published2008 May
ISSN0907-4449
KeywordsCrystallography, X-Ray, Escherichia coli Proteins, Intramolecular Transferases, Magnesium, Models, Molecular, Molecular Structure, Protein Binding, Protein Structure, Secondary, Protein Structure, Tertiary
Abstract

The electron carrier menaquinone is one of many important bacterial metabolites that are derived from the key intermediate chorismic acid. MenF, the first enzyme in the menaquinone pathway, catalyzes the isomerization of chorismate to isochorismate. Here, an improved structure of MenF in a new crystal form is presented. The structure, solved at 2.0 angstroms resolution in complex with magnesium, reveals a well defined closed active site. Existing evidence suggests that the mechanism of the reaction catalyzed by MenF involves nucleophilic attack of a water molecule on the chorismate ring. The structure reveals a well defined water molecule located in an appropriate position for activation by Lys190 and attack on the substrate.

DOI10.1107/S0907444908005477
Alternate JournalActa Crystallogr. D Biol. Crystallogr.
PubMed ID18453696
PubMed Central IDPMC2467529
Grant ListAI067530 / AI / NIAID NIH HHS / United States