Výsledky vyhledávání - "David E. Sheppard"

Evidence that a B 12 -Adenosyl Transferase Is Encoded within the Ethanolamine Operon of Salmonella enterica

Autor: John R. Roth, Thomas A. Bobik, Eric Kofoid, Joseph T. Penrod, David E. Sheppard

Publikováno v: Journal of Bacteriology. 186:7635-7644

Adenosylcobalamin (Ado-B 12 ) is both the cofactor and inducer of ethanolamine ammonia lyase (EA-lyase), a catabolic enzyme for ethanolamine. De novo synthesis of Ado-B 12 by Salmonella enterica occurs only under anaerobic conditions. Therefore, aero

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ced3d8d06e055d37280155221b61b929
https://doi.org/10.1128/jb.186.22.7635-7644.2004

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Ethanolamine Utilization inSalmonella

Autor: David E. Sheppard, David Roof

In 1984, only two B12- dependent enzymes were known in Salmonella, ethanolamine ammonia lyase, required for use of ethanolamine (EA) as a nitrogen and carbon source, and a methyltransferase involved in cysteine biosynthesis. A genetic analysis of eth

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b47b1cb5d6e2fa029c6f5b3512979e91
https://doi.org/10.1128/9781555816810.ch10

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A rationale for autoinduction of a transcriptional activator: ethanolamine ammonia-lyase (EutBC) and the operon activator (EutR) compete for adenosyl-cobalamin in Salmonella typhimurium

Autor: John R. Roth, David E. Sheppard

Publikováno v: Journal of Bacteriology. 176:1287-1296

The ethanolamine utilization (eut) operon of Salmonella typhimurium is controlled by a positive regulatory protein (EutR) which stimulates eut operon expression in response to the simultaneous presence of two effectors, ethanolamine and adenosyl-coba

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fd752e4a149c8e812d70feab296cf7d
https://doi.org/10.1128/jb.176.5.1287-1296.1994

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Characterization of Strong Polar Mutations in a Region Immediately Adjacent to the l -Arabinose Operator in Escherichia coli B/r

Autor: Marianne Eleuterio, David E. Sheppard, Barbara Griffin

Publikováno v: Journal of Bacteriology. 111:383-391

Seven l -arabinose-negative mutations are described that map in three genetically distinct regions immediately adjacent to the araO (operator) region of the l -arabinose operon. All seven mutants revert spontaneously, exhibit a cis -dominant, trans -

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3860eae35eea81ce78ed942e4c09bf24
https://doi.org/10.1128/jb.111.2.383-391.1972

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Density gradient centrifugation of bacteriophage P22

Autor: David E. Sheppard

Publikováno v: Virology. 17:212-214

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45d3cf1863b6b13c3536448aea940b43
https://doi.org/10.1016/0042-6822(62)90105-8

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Mutations in the l-Arabinose Operon of Escherichia coli B/r That Result in Hypersensitivity to Catabolite Repression

Autor: Robert P. Gendron, David E. Sheppard

Two independent mutants resistant to l -arabinose inhibition only in the presence of d -glucose were isolated from an l -arabinose-sensitive strain containing the araD139 mutation. Preliminary mapping studies indicate that these mutations are closely

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62a7a81612a3c685ce915f3deb43fa56
https://europepmc.org/articles/PMC285528/

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Behavioral Mutants of DROSOPHILA MELANOGASTER. I. Isolation and Mapping of Mutations Which Decrease Flight Ability

Autor: David E. Sheppard, Theodore Homyk

A flight test box was developed and used in the isolation and initial characterization of Drosophila melanogaster mutants defective in flight behavior. Forty-eight mutants were isolated from F1 progeny of ethyl methanesulfonate-treated males. Genetic

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https://europepmc.org/articles/PMC1213734/

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Polarity in gene araB of the l-Arabinose operon in Escherichia coli B/r

Autor: Derinda A. Walker, David E. Sheppard

Publikováno v: Journal of bacteriology. 100(2)

A series of mutations are described which map in the araB gene of the l -arabinose operon and exert a polar effect on gene araA , the structural gene for the l -arabinose isomerase. Ten of the 20 araB point mutants examined exhibited absolute polarit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::490334c23f29d4e9f73365928dd092fd
https://pubmed.ncbi.nlm.nih.gov/4901356

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