Abstract
Menaquinone biosynthesis is initiated by the conversion of chorismate to isochorismate, a reaction that is catalyzed by the menaquinone-specific isochorismate synthase, MenF. The catalytic mechanism of MenF has been probed using a combination of structural and biochemical studies, including the 2.5 A structure of the enzyme, and Lys190 has been identified as the base that activates water for nucleophilic attack at the chorismate C2 carbon. MenF is a member of a larger family of Mg2+ dependent chorismate binding enzymes catalyzing distinct chorismate transformations. The studies reported here extend the mechanism recently proposed for this enzyme family by He et al.: He, Z., Stigers Lavoie, K. D., Bartlett, P. A., and Toney, M. D. (2004) J. Am. Chem. Soc. 126, 2378-85.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Amino Acid Sequence
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Base Sequence
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Catalytic Domain
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Chorismic Acid / metabolism
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Crystallography, X-Ray
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DNA, Bacterial / genetics
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Escherichia coli / enzymology*
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Escherichia coli / genetics
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Intramolecular Transferases / chemistry*
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Intramolecular Transferases / genetics
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Intramolecular Transferases / metabolism*
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Kinetics
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Lysine / chemistry
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Models, Molecular
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Molecular Sequence Data
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Mutagenesis, Site-Directed
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Recombinant Proteins / chemistry
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Recombinant Proteins / genetics
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Recombinant Proteins / metabolism
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Sequence Homology, Amino Acid
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Substrate Specificity
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Vitamin K 2 / metabolism*
Substances
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DNA, Bacterial
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Recombinant Proteins
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Vitamin K 2
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Intramolecular Transferases
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isochorismate synthase
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Chorismic Acid
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Lysine