IUBMB Enzyme Nomenclature


Accepted name: tetraacyldisaccharide 4'-kinase

Reaction: ATP + a lipid A disaccharide = ADP + a lipid IVA

For diagram of reaction click here

Glossary: a lipid A disaccharide = a dephospho-lipid IVA = 2-deoxy-2-{[(3R)-3-hydroxyacyl]amino}-3-O-[(3R)-3-hydroxyacyl]-β-D-glucopyranosyl-(1→6)-2-deoxy-3-O-[(3R)-3-hydroxyacyl]-2-{[(3R)-3-hydroxyacyl]amino}-1-O-phospho-α-D-glucopyranose
a lipid IVA = 2-deoxy-2-{[(3R)-3-hydroxyacyl]amino}-3-O-[(3R)-3-hydroxyacyl]-4-O-phospho-β-D-glucopyranosyl-(1→6)-2-deoxy-3-O-[(3R)-3-hydroxyacyl]-2-{[(3R)-3-hydroxyacyl]amino}-1-O-phospho-α-D-glucopyranose

Other name(s): lpxK (gene name); lipid-A 4'-kinase; ATP:2,2',3,3'-tetrakis[(3R)-3-hydroxytetradecanoyl]-β-D-glucosaminyl-(1→6)-α-D-glucosaminyl-phosphate 4'-O-phosphotransferase

Systematic name: ATP:2-deoxy-2-{[(3R)-3-hydroxyacyl]amino}-3-O-[(3R)-3-hydroxyacyl]-β-D-glucopyranosyl-(1→6)-2-deoxy-3-O-[(3R)-3-hydroxyacyl]-2-{[(3R)-3-hydroxyacyl]amino}-1-O-phospho-α-D-glucopyranose 4'-O-phosphotransferase

Comments: Involved with EC (acyl-[acyl-carrier-protein]—UDP-N-acetylglucosamine O-acyltransferase) and EC (lipid-A-disaccharide synthase) in the biosynthesis of the phosphorylated glycolipid, lipid A, in the outer membrane of Gram-negative bacteria.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 107309-06-8


1. Ray, B.L. and Raetz, C.R.H. The biosynthesis of gram-negative endotoxin. A novel kinase in Escherichia coli membranes that incorporates the 4'-phosphate of lipid A. J. Biol. Chem. 262 (1987) 1122-1128. [PMID: 3027079]

2. Emptage, R.P., Daughtry, K.D., Pemble, C.W., 4th and Raetz, C.R. Crystal structure of LpxK, the 4'-kinase of lipid A biosynthesis and atypical P-loop kinase functioning at the membrane interface. Proc. Natl. Acad. Sci. USA 109 (2012) 12956-12961. [PMID: 22826246]

3. Emptage, R.P., Pemble, C.W., 4th, York, J.D., Raetz, C.R. and Zhou, P. Mechanistic characterization of the tetraacyldisaccharide-1-phosphate 4'-kinase LpxK involved in lipid A biosynthesis. Biochemistry 52 (2013) 2280-2290. [PMID: 23464738]

4. Emptage, R.P., Tonthat, N.K., York, J.D., Schumacher, M.A. and Zhou, P. Structural basis of lipid binding for the membrane-embedded tetraacyldisaccharide-1-phosphate 4'-kinase LpxK. J. Biol. Chem. 289 (2014) 24059-24068. [PMID: 25023290]

[EC created 1990, modified 2021]

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