sn-1,2-Diacylglycerol kinase of Escherichia coli. Purification, reconstitution, and partial amino- and carboxyl-terminal analysis

C. R. Loomis, J. P. Walsh, R. M. Bell

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The sn-1,2-diacylglycerol kinase structural gene from Escherichia coli was demonstrated to be the dgkA locus previously sequenced. The dgkA gene product was shown by maxicell analysis to be an M(r)=14,000 membrane-bound protein. When dgkA was placed on a hybrid plasmid under control of the λp(L) promoter, a 100-fold overproduction of diacylglycerol kinase activity was obtained. Diacylglycerol kinase was solubilized from membranes with 2-propanol/heptane/trifluoroacetic acid and purified to near homogeneity by high performance liquid chromatography. Activity was reconstituted in a mixed micellar assay containing β-octylglucoside, cardiolipin, and sn-1,2-dioleoylglycerol. Amino acid analysis, partial NH2-terminal analysis and COOH-terminal analysis permitted alignment of the polypeptide on the sequenced gene. The data establish that dgkA is the structural gene for the diacylglycerol kinase and establish the primary structure of the enzyme of 122 residues, 13,245 daltons. Secondary structure analysis predicted a protein conformation consisting of three transmembrane α-helical segments, an amphipathic helix, and an α-helix. Taken together, the predicted helical segments comprise more than 75% of the polypeptide.

Original languageEnglish (US)
Pages (from-to)4091-4097
Number of pages7
JournalJournal of Biological Chemistry
Volume260
Issue number7
StatePublished - 1985
Externally publishedYes

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Diacylglycerol Kinase
Escherichia coli
Purification
Genes
Membranes
Heptanes
Trifluoroacetic Acid
Peptides
Protein Conformation
Cardiolipins
2-Propanol
High performance liquid chromatography
Conformations
Assays
Membrane Proteins
Proteins
Plasmids
High Pressure Liquid Chromatography
Amino Acids
Enzymes

ASJC Scopus subject areas

  • Biochemistry

Cite this

sn-1,2-Diacylglycerol kinase of Escherichia coli. Purification, reconstitution, and partial amino- and carboxyl-terminal analysis. / Loomis, C. R.; Walsh, J. P.; Bell, R. M.

In: Journal of Biological Chemistry, Vol. 260, No. 7, 1985, p. 4091-4097.

Research output: Contribution to journalArticle

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