Structure and mechanism of 3-deoxy-d-manno-octulosonate 8-phosphate synthase

Radaev, Sergei ; Dastidar, Parthasarathi ; Patel, Mayur ; Woodard, Ronald W. ; Gatti, Domenico L. (2000) Structure and mechanism of 3-deoxy-d-manno-octulosonate 8-phosphate synthase Journal of Biological Chemistry, 275 (13). pp. 9476-9484. ISSN 0021-9258

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3-Deoxy-d-manno-octulosonate 8-phosphate (KDO8P) synthase catalyzes the condensation of phosphoenolpyruvate (PEP) with arabinose 5-phosphate (A5P) to form KDO8P and inorganic phosphate. KDO8P is the phosphorylated precursor of 3-deoxy-d-manno-octulosonate, an essential sugar of the lipopolysaccharide of Gram-negative bacteria. The crystal structure of the Escherichia coli KDO8P synthase has been determined by multiple wavelength anomalous diffraction and the model has been refined to 2.4 Å (R-factor, 19.9%; R-free, 23.9%). KDO8P synthase is a homotetramer in which each monomer has the fold of a (β/α)8 barrel. On the basis of the features of the active site, PEP and A5P are predicted to bind with their phosphate moieties 13 Å apart such that KDO8P synthesis would proceed via a linear intermediate. A reaction similar to KDO8P synthesis, the condensation of phosphoenolpyruvate, and erythrose 4-phosphate to form 3-deoxy-d-arabino-heptulosonate 7-phosphate (DAH7P), is catalyzed by DAH7P synthase. In the active site of DAH7P synthase the two substrates PEP and erythrose 4-phosphate appear to bind in a configuration similar to that proposed for PEP and A5P in the active site of KDO8P synthase. This observation suggests that KDO8P synthase and DAH7P synthase evolved from a common ancestor and that they adopt the same catalytic strategy.

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Source:Copyright of this article belongs to American Society for Biochemistry and Molecular Biology.
ID Code:112831
Deposited On:19 Apr 2018 11:35
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