1993
The periplasmic dipeptide permease system transports 5-aminolevulinic acid in Escherichia coli
Verkamp E, Backman V, Björnsson J, Söll D, Eggertsson G. The periplasmic dipeptide permease system transports 5-aminolevulinic acid in Escherichia coli. Journal Of Bacteriology 1993, 175: 1452-1456. PMID: 8444807, PMCID: PMC193232, DOI: 10.1128/jb.175.5.1452-1456.1993.Peer-Reviewed Original ResearchConceptsDpp operonE. coli chromosomeEscherichia coliWild-type growthClasses of mutantsAbsence of ALAGenetic screenDpp mutationsColi chromosomeDpp transportALA biosynthesisFirst geneDipeptide transport systemAnaerobic growthChromosomal insertionOperonRecombinant plasmidTransport systemExogenous ALAALA uptakeE. coliNormal growthMutantsMutationsColi
1991
delta-Aminolevulinic acid dehydratase deficiency can cause delta-aminolevulinate auxotrophy in Escherichia coli
O'Neill G, Thorbjarnardóttir S, Michelsen U, Pálsson S, Söll D, Eggertsson G. delta-Aminolevulinic acid dehydratase deficiency can cause delta-aminolevulinate auxotrophy in Escherichia coli. Journal Of Bacteriology 1991, 173: 94-100. PMID: 1987138, PMCID: PMC207161, DOI: 10.1128/jb.173.1.94-100.1991.Peer-Reviewed Original ResearchConceptsALA dehydratase activityEscherichia coliWild-type geneClasses of mutantsDNA sequence analysisAminoglycoside antibiotic kanamycinHeme biosynthetic pathwayALA biosynthesisWild-type DNAAuxotrophic phenotypeComplementation studiesDehydratase activityHemB geneBiosynthetic pathwayPositive regulationALA formationSame geneMutantsPenicillin enrichmentSequence analysisGenesAntibiotic kanamycinDiffusible productHemB mutantEnzymatic activity
1979
Regulation of biosynthesis of aminoacyl-transfer RNA synthetases and of transfer-RNA in Escherichia coli.
Morgan S, Larossa R, Cheung A, Low B, Söll D. Regulation of biosynthesis of aminoacyl-transfer RNA synthetases and of transfer-RNA in Escherichia coli. Biological Research 1979, 12: 415-26. PMID: 45219.Peer-Reviewed Original ResearchConceptsGlutaminyl-tRNA synthetaseLeucyl-tRNA synthetaseGlnR mutantRegulation of biosynthesisClasses of mutantsTemperature-resistant revertantsOperator-promoter regionAminoacyl-transfer RNA synthetasesStructural geneLeu genesRegulatory mutantsThermolabile leucyl-tRNA synthetaseMutantsResistant revertantsFormation of glutamineGlutamine synthetaseE. coli strainsEscherichia coliRNA synthetasesGenesSynthetaseElevated levelsRevertantsColi strainsGlnT