4LKV image
Entry Detail
PDB ID:
4LKV
Keywords:
Title:
Determinants of lipid substrate and membrane binding for the tetraacyldisaccharide-1-phosphate 4 -kinase LpxK
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-07-08
Release Date:
2014-07-09
Method Details:
Experimental Method:
Resolution:
3.51 Å
R-Value Free:
0.33
R-Value Work:
0.26
R-Value Observed:
0.27
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Tetraacyldisaccharide 4'-kinase
Chain IDs:A, B, C, D
Chain Length:315
Number of Molecules:4
Biological Source:Aquifex aeolicus
Primary Citation
Structural Basis of Lipid Binding for the Membrane-embedded Tetraacyldisaccharide-1-phosphate 4'-Kinase LpxK.
J.Biol.Chem. 289 24059 24068 (2014)
PMID: 25023290 DOI: 10.1074/jbc.M114.589986

Abstact

The membrane-bound tetraacyldisaccharide-1-phosphate 4'-kinase, LpxK, catalyzes the sixth step of the lipid A (Raetz) biosynthetic pathway and is a viable antibiotic target against emerging Gram-negative pathogens. We report the crystal structure of lipid IVA, the LpxK product, bound to the enzyme, providing a rare glimpse into interfacial catalysis and the surface scanning strategy by which many poorly understood lipid modification enzymes operate. Unlike the few previously structurally characterized proteins that bind lipid A or its precursors, LpxK binds almost exclusively to the glucosamine/phosphate moieties of the lipid molecule. Steady-state kinetic analysis of multiple point mutants of the lipid-binding pocket pinpoints critical residues involved in substrate binding, and characterization of N-terminal helix truncation mutants uncovers the role of this substructure as a hydrophobic membrane anchor. These studies make critical contributions to the limited knowledge surrounding membrane-bound enzymes that act upon lipid substrates and provide a structural template for designing small molecule inhibitors targeting this essential kinase.

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