Výsledky vyhledávání - "W. B. Dempsey"

Suppression of insertions in the complex pdxJ operon of Escherichia coli K-12 by lon and other mutations

Autor: Hon-Ming Lam, Malcolm E. Winkler, W. B. Dempsey, E. Tancula

Publikováno v: Scopus-Elsevier

Complementation analyses using minimal recombinant clones showed that all known pdx point mutations, which cause pyridoxine (vitamin B6) or pyridoxal auxotrophy, are located in the pdxA, pdxB, serC, pdxJ, and pdxH genes. Antibiotic enrichments for ch

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2c1c6c4ff600a20cc32c17287d6f8d7
https://doi.org/10.1128/jb.174.5.1554-1567.1992

Zobrazit plný text záznamu

Incorporation of pantothenate into citrate lyase by a pantothenateless mutant of Klebsiella pneumoniae

Autor: M Singh, P A Srere, W B Dempsey

Publikováno v: Journal of Bacteriology. 124:686-692

A pantothenate-requiring mutant of Klebsiella pneumoniae was isolated. The mutant showed an absolute dependence on pantothenate for growth. When grown in the presence of [14C]pantothenate, the mutant incorporated [14C]pantothenate into citrate lyase

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee06d2eed18a82ff838a033c95ce6320
https://doi.org/10.1128/jb.124.2.686-692.1975

Zobrazit plný text záznamu

Sense and antisense transcripts of traM, a conjugal transfer gene of the antibiotic resistance plasmid R100

Autor: W. B. Dempsey

Publikováno v: Molecular Microbiology. 3:561-570

The region of the antibiotic resistance plasmid R100 that encodes the plasmid-specific transfer gene traM has two tandemly aligned promoters separated by 145 nucleotides. The principal transcripts are 705 and 562 nucleotides long. Minor transcripts a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70573276e1925d70a1c826e8d78da961
https://doi.org/10.1111/j.1365-2958.1989.tb00202.x

Zobrazit plný text záznamu

Cloning, mapping, and sequencing of plasmid R100 traM and finP genes

Autor: B E Fee, W B Dempsey

Publikováno v: Journal of Bacteriology. 167:336-345

The fertility control gene finP, the transfer gene traM, and the transfer origin, oriT, of plasmid R100 were isolated on a single 1.2-kilobase EcoRV fragment and were then subcloned as HaeIII fragments. The sequence of the 754-base-pair finP-containi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4d1bc8facf521272683361fd8d30194
https://doi.org/10.1128/jb.167.1.336-345.1986

Zobrazit plný text záznamu

Derepression of conjugal transfer of the antibiotic resistance plasmid R100 by antisense RNA

Autor: W B Dempsey

Publikováno v: Journal of Bacteriology. 171:2886-2888

Conjugal transfer of the normally repressed antibiotic resistance plasmid R100 was derepressed by fragments of R100 that carried the traJ promoter and the traJ leader but lacked the finP promoter.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9bce3fb41dd38d57c573077f81d275e
https://doi.org/10.1128/jb.171.5.2886-2888.1989

Zobrazit plný text záznamu

Threonine prevents derepression of pyridoxine synthesis in Escherichia coli B

Autor: W B Dempsey

Publikováno v: Journal of bacteriology. 150(3)

After 40 min of pyridoxal starvation, pyridoxine phosphate oxidase-less mutants of Escherichia coli B derepressed pyridoxine biosynthesis 13-fold to a rate of 1.7 X 10(-9) mol/h per mg of cells. Threonine at 100 mg/liter prevented this derepression b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::17032ac431015d36086cd295f06efe3e
https://pubmed.ncbi.nlm.nih.gov/6804445

Zobrazit plný text záznamu

oriT sequence of the antibiotic resistance plasmid R100

Autor: S A McIntire, W B Dempsey

We present the nucleotide sequence of the oriT region from plasmid R100. Comparison to other IncF plasmids revealed homology around the proposed nick sites as well as conservation of inverted repeated sequences in the nonhomologous region. Three area

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7261337818b4df54e6b912205b1ec197
https://europepmc.org/articles/PMC212476/

Zobrazit plný text záznamu

Pyridoxine-requiring mutants of Escherichia coli: glycolaldehyde dehydrogenase is not coded for by the pdxB gene

Autor: S Shimizu, W B Dempsey

Publikováno v: Journal of bacteriology. 133(3)

Twenty-seven independent pyridoxineless mutants belonging to genetic linkage group I were assayed for glycolaldehyde dehydrogenase. Some mutants lacked enzyme activity entirely, and others showed activity ranging from very low to wild-type levels. Re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44960fbcf3099df5e863d1ad724d0634
https://pubmed.ncbi.nlm.nih.gov/346565

Zobrazit plný text záznamu

Plasmid co-integrates of prophage lambda and R factor R100

Autor: W B Dempsey, N S Willetts

Single and tandem insertions of prophage lambda into R100 have been isolated. Insertions into the transfer genes, insertions into the transfer control gene finO, and insertions into regions that result in no detectable phenotypic change were found. F

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8fbad18acca0ed9ff18bf5a20211c98
https://europepmc.org/articles/PMC233271/

Zobrazit plný text záznamu

3-hydroxypyruvate substitutes for pyridoxine in serC mutants of Escherichia coli K-12

Autor: S Shimizu, W B Dempsey

Publikováno v: Journal of bacteriology. 134(3)

Escherichia coli K-12 mutants with serC genotype required pyridoxine and serine for normal growth, as do E. coli B mutants of this type. Mutants of the K-12 strain, however, reverted easily to pyridoxine independence without regaining activity in the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20a38572ad7707ec7afbd94554973295
https://pubmed.ncbi.nlm.nih.gov/350858

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání