Linked Life Data

3900274

Source:http://linkedlifedata.com/resource/pubmed/id/3900274

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1985-11-15
pubmed:abstractText
Two classes of pyridine nucleotide uptake mutants isolated previously in a strain of Salmonella typhimurium defective in both de novo NAD biosynthesis (nad) and pyridine nucleotide recycling (pncA) were analysed in terms of their genetic relationship to each other and their roles in the transport of nicotinamide mononucleotide as a precursor to NAD. The first class of uptake mutants, pnuA (99 units), failed to grow on nicotinamide mononucleotide (NMN) as a precursor for NAD. The second class, pnuB, grew on lower than normal levels of NMN and suppressed pnuA mutations. A third class of uptake mutant, pnuC, isolated in a nadB pncA pnuB background, also failed to grow on NMN. Transport studies and enzyme analyses confirmed these strains as defective in NMN uptake. A fourth locus, designated pnuD, was found to diminish NMN utilization in a nad pncA+ background. Tn10 insertions near pnuA, pnuC and pnuD were isolated and utilized in mapping studies. pnuA was found to map between thr and serB near trpR. The pnuC locus was cotransducible with nadA at 17 units while pnuD mapped at approximately 60 units. The biochemical and genetic data suggest that the pnuA and pnuC gene products cooperate in the utilization of NMN under normal conditions. A pnuB mutant, however, does not require the pnuA gene product for NMN uptake but does rely on the pnuC product. Fusion studies indicate that pnuC is regulated by internal NAD concentrations.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0022-1287
pubmed:author
pubmed:issnType
Print
pubmed:volume
131
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1313-22
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Genetic characterization of pyridine nucleotide uptake mutants of Salmonella typhimurium.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.