Sandra K. Armstrong

There are 8 included publications by Sandra K. Armstrong :

TitleDateViewsBrief Description
Bordetella pertussis fur gene restores iron repressibility of siderophore and protein expression to deregulated Bordetella bronchiseptica mutants. 2011 688479 We report the isolation and preliminary phenotypic characterization of manganese-resistant Bordetella bronchiseptica mutants with respect to deregulation of siderophore and iron-regulated protein expression. The fur gene of Bordetella pertussis was c...
Essential Role of the Iron-Regulated Outer Membrane Receptor FauA in Alcaligin Siderophore-Mediated Iron Uptake in Bordetella Species 2011 688479 Phenotypic analysis using heterologous host systems localized putative Bordetella pertussis ferric alcaligin transport genes and Fur-binding sequences to a 3.8-kb genetic region downstream from the alcR regulator gene. Nucleotide sequencing identifie...
Identification and Characterization of alcR a Gene Encoding an AraC-Like Regulator of Alcaligin Siderophore Biosynthesis and Transport in Bordetella pertussis and Bordetella bronchiseptica 2011 688479 A Bordetella bronchiseptica iron transport mutant was isolated following an enrichment procedure based on streptonigrin resistance. The mutant displayed a growth defect on iron-restricted medium containing ferric alcaligin as the sole iron source. In...
Identification and characterization of iron-regulated Bordetella pertussis alcaligin siderophore biosynthesis genes. 2011 688479 Bordetella bronchiseptica mutants BRM1 BRM6 and BRM9 fail to produce the native dihydroxamate siderophore alcaligin. A 4.5-kb BamHI-SmaI Bordetella pertussis genomic DNA fragment carried multiple genes required to restore alcaligin production to thes...
Isolation and characterization of Bordetella bronchiseptica mutants deficient in siderophore activity. 2011 688479 Iron acquisition by the gram-negative pathogens Bordetella bronchiseptica and Bordetella pertussis is thought to occur by hydroxamate siderophore-mediated transport as well as an apparently siderophore-independent process by which host transferrins b...
The ornithine decarboxylase gene odc is required for alcaligin siderophore biosynthesis in Bordetella spp.: putrescine is a precursor of alcaligin. 2011 688479 Chromosomal insertions defining Bordetella bronchiseptica siderophore phenotypic complementation group III mutants BRM3 and BRM5 were found to reside approximately 200 to 300 bp apart by restriction mapping of cloned genomic regions associated with t...
Transcriptional Activation of Bordetella Alcaligin Siderophore Genes Requires the AlcR Regulator with Alcaligin as Inducer 2011 688479 Genetic and biochemical studies have established that Fur and iron mediate repression of Bordetella alcaligin siderophore system (alc) genes under iron-replete nutritional growth conditions. In this study transcriptional analyses using Bordetella chr...
Transcriptional Analysis of the Bordetella Alcaligin Siderophore Biosynthesis Operon 2011 688479 The alc gene cluster of Bordetella pertussis includes three genes alcA alcB and alcC which are involved in alcaligin siderophore biosynthesis in response to iron starvation. The production of AlcA AlcB and AlcC in Bordetella cells and the transcripti...