Linked Life Data

10568808

Source:http://linkedlifedata.com/resource/pubmed/id/10568808

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2000-1-4
pubmed:abstractText
Rapid growth of Salmonella typhimurium LT2 in rich LB-broth caused the induction of the cysteine regulon when the culture reached an optical density at 650 nm of 1.5. Addition of 0.05 mM L-cystine to LB-broth abolished induction, while 0.025 mM L-cystine delayed it for a doubling time (30 min). Induction did not occur when lack of oxygen or a temperature shift to 19 degrees C slowed down growth in LB-broth. Uninduced cultures reached growth yield similar to that of induced cultures after overnight incubation. Growth on solid LB-medium also brought about induction, but to a lower level than in liquid medium. Leaky cysB mutants, which are sensitive to the beta-lactam antibiotic mecillinam, displayed partial induction, whereas mecillinam-resistant cysB and cysE mutants showed no induction. It is suggested that induction develops in these mutants when constitutive transport systems fail to satisfy the high uptake of cysteine demanded by fast-growing cultures. The behavior of cysB mutants agrees with the hypothesis that, under some conditions, mecillinam action would be dependent on expression of the cysteine regulon.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0343-8651
pubmed:author
pubmed:issnType
Print
pubmed:volume
40
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
72-7
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Induction of the cysteine regulon of Salmonella typhimurium in LB medium affects the response of cysB mutants to mecillinam.
pubmed:affiliation
Departamento de Radiobiología, Comisión Nacional de Energía Atómica, Avda. General Paz 1499, 1650 San Martín, Argentina.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't