3ct6

Crystal structure of DhaM of L. lactis

spinqualitylabelsall models 3ct6, resolution 1.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ct6 is a 2 chain structure with sequence from Lactococcus lactis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: dhaM (Lactococcus lactis) Resources: FirstGlance, OCA, RCSB, PDBsum Function [DHAM_LACLA] Phosphotransferase subunit of the dihydroxyacetone kinase, which is responsible for phosphorylating dihydroxyacetone. DhaM serves as the phosphoryl donor (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Bacterial dihydroxyacetone (Dha) kinases do not exchange the ADP for ATP but utilize a subunit of the phosphoenolpyruvate carbohydrate phosphotransferase system for in situ rephosphorylation of a permanently bound ADP-cofactor. Here we report the 2.1-angstroms crystal structure of the transient complex between the phosphotransferase subunit DhaM of the phosphotransferase system and the nucleotide binding subunit DhaL of the Dha kinase of Lactococcus lactis, the 1.1-angstroms structure of the free DhaM dimer, and the 2.5-angstroms structure of the Dha-binding DhaK subunit. Conserved salt bridges and an edge-to-plane stacking contact between two tyrosines serve to orient DhaL relative to the DhaM dimer. The distance between the imidazole Nepsilon2 of the DhaM His-10 and the beta-phosphate oxygen of ADP, between which the gamma-phosphate is transferred, is 4.9 angstroms. An invariant arginine, which is essential for activity, is appropriately positioned to stabilize the gamma-phosphate in the transition state. The (betaalpha)4alpha fold of DhaM occurs a second time as a subfold in the DhaK subunit. By docking DhaL-ADP to this subfold, the nucleotide bound to DhaL and the C1-hydroxyl of Dha bound to DhaK are positioned for in-line transfer of phosphate. X-ray structures of the three Lactococcus lactis dihydroxyacetone kinase subunits and of a transient intersubunit complex.,Zurbriggen A, Jeckelmann JM, Christen S, Bieniossek C, Baumann U, Erni B J Biol Chem. 2008 Dec 19;283(51):35789-96. Epub 2008 Oct 28. PMID:18957416 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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