Download MendeleyAnalysis of the Staphylococcus aureus DgkB Structure Reveals a Common Catalytic Mechanism for the Soluble Diacylglycerol Kinases.
Miller, D.J., Jerga, A., Rock, C.O., White, S.W.(2008) Structure 16: 1036-1046
- PubMed: 18611377
- DOI: https://doi.org/10.1016/j.str.2008.03.019
- Primary Citation of Related Structures:
2QV7, 2QVL - PubMed Abstract:
Soluble diacylglycerol (DAG) kinases function as regulators of diacylglycerol metabolism in cell signaling and intermediary metabolism. We report the structure of a DAG kinase, DgkB from Staphylococcus aureus, both as the free enzyme and in complex with ADP. The molecule is a tight homodimer, and each monomer comprises two domains with the catalytic center located within the interdomain cleft. Two distinctive features of DkgB are a structural Mg2+ site and an associated Asp*water*Mg2+ network that extends toward the active site locale. Site-directed mutagenesis revealed that these features play important roles in the catalytic mechanism. The key active site residues and the components of the Asp*water*Mg2+ network are conserved in the catalytic cores of the mammalian signaling DAG kinases, indicating that these enzymes use the same mechanism and have similar structures as DgkB.
Organizational Affiliation:
Department of Structural Biology, St. Jude Children's Research Hospital, and Department of Molecular Sciences, University of Tennessee Health Science Center, 332 North Lauderdale Street, Memphis, TN 38105, USA.
