Description
Diacylglycerol kinase catalyses the ATP-dependent conversion of diacylglycerol to phosphatidic acid in the plasma membrane of Escherichia coli. The small size of this integral membrane trimer, which has 121 residues per subunit, means that available protein must be used economically

Diacylglycerol kinase catalyses the ATP-dependent conversion of diacylglycerol to phosphatidic acid in the plasma membrane of Escherichia coli. The small size of this integral membrane trimer, which has 121 residues per subunit, means that available protein must be used economically to craft three catalytic and substrate-binding sites centred about the membrane/cytosol interface. How nature has accomplished this extraordinary feat is revealed here in a crystal structure of the kinase captured as a ternary complex with bound lipid substrate and an ATP analogue. Residues, identified as essential for activity by mutagenesis, decorate the active site and are rationalized by the ternary structure. The γ-phosphate of the ATP analogue is positioned for direct transfer to the primary hydroxyl of the lipid whose acyl chain is in the membrane. A catalytic mechanism for this unique enzyme is proposed. The active site architecture shows clear evidence of having arisen by convergent evolution.
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    Title
    • Ternary structure reveals mechanism of a membrane diacylglycerol kinase
    Date Created
    2015-12-17
    Resource Type
  • Text
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    Identifier
    • Digital object identifier: 10.1038/ncomms10140
    • Identifier Type
      International standard serial number
      Identifier Value
      2041-1723
    Note
    • The final version of this article, as published in Nature Communications, can be viewed online at: https://www.nature.com/articles/ncomms10140

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    Li, D., Stansfeld, P. J., Sansom, M. S., Keogh, A., Vogeley, L., Howe, N., . . . Caffrey, M. (2015). Ternary structure reveals mechanism of a membrane diacylglycerol kinase. Nature Communications, 6, 10140. doi:10.1038/ncomms10140

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