NDLI: The Sorbitol Phosphotransferase System Is Responsible for Transport of 2-C-Methyl-d-Erythritol into Salmonella enterica Serovar Typhimurium

Content Provider	PubMed Central
Author	Testa, Charles A. Cornish, Rita M. Poulter, C. Dale
Copyright Year	2004
Abstract	2-C-methyl-d-erythritol 4-phosphate is the first committed intermediate in the biosynthesis of the isoprenoid precursors isopentenyl diphosphate and dimethylallyl diphosphate. Supplementation of the growth medium with 2-C-methyl-d-erythritol has been shown to complement disruptions in the Escherichia coli gene for 1-deoxy-d-xylulose 5-phosphate synthase, the enzyme that synthesizes the immediate precursor of 2-C-methyl-d-erythritol 4-phosphate. In order to be utilized in isoprenoid biosynthesis, 2-C-methyl-d-erythritol must be phosphorylated. We describe the construction of Salmonella enterica serovar Typhimurium strain RMC26, in which the essential gene encoding 1-deoxy-d-xylulose 5-phosphate synthase has been disrupted by insertion of a synthetic mevalonate operon consisting of the yeast ERG8, ERG12, and ERG19 genes, responsible for converting mevalonate to isopentenyl diphosphate under the control of an arabinose-inducible promoter. Random mutagenesis of RMC26 produced defects in the sorbitol phosphotransferase system that prevented the transport of 2-C-methyl-d-erythritol into the cell. RMC26 and mutant strains of RMC26 unable to grow on 2-C-methyl-d-erythritol were incubated in buffer containing mevalonate and deuterium-labeled 2-C-methyl-d-erythritol. Ubiquinone-8 was isolated from these cells and analyzed for deuterium content. Efficient incorporation of deuterium was observed for RMC26. However, there was no evidence of deuterium incorporation into the isoprenoid side chain of ubiquinone Q8 in the RMC26 mutants.
Related Links	http://dx.doi.org/10.1128/jb.186.2.473-480.2004
Ending Page	480
Page Count	8
Starting Page	473
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	2
Volume Number	186
Language	English
Publisher	American Society for Microbiology
Publisher Date	2004-01-15
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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