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Conversion from the nonmucoid to the mucoid phenotype is a typical feature of Pseudomonas aeruginosa strains causing chronic pulmonary infections in cystic fibrosis patients. One of the key genetic controls in this conversion to mucoidy is from the algT(U)-mucA-mucB(algN) locus, located at 67.5 min on the standard P. aeruginosa chromosomal map. The algT(More)
Nucleoside-diphosphate kinase (ATP:nucleoside-diphosphate phosphotransferase, EC 2.7.4.6; NDP kinase) is an important enzyme for the maintenance of the correct cellular levels of nucleoside triphosphates (NTPs) and their deoxy derivatives (dNTPs) and is involved in the regulation of cellular development. The enzyme is under the dual control of algR2 and(More)
We report the cloning and determination of the nucleotide sequence of the gene encoding nucleoside diphosphate kinase (Ndk) from Pseudomonas aeruginosa. The amino acid sequence of Ndk was highly homologous with other known bacterial and eukaryotic Ndks (39.9 to 58.3% amino acid identity). We have previously reported that P. aeruginosa strains with mutations(More)
The regulatory protein AlgR2 in Pseudomonas aeruginosa positively regulates nucleoside diphosphate kinase (Ndk) and succinyl-CoA synthetase, enzymes critical in nucleoside triphosphate (NTP) formation. AlgR2 positively regulates the production of alginate, GTP, ppGpp and inorganic polyphosphate (poly P). An algR2 mutant with low levels of these metabolites(More)
Infection with mucoid, alginate-producing strains of Pseudomonas aeruginosa is the leading cause of mortality among patients with cystic fibrosis. Alginate production by P. aeruginosa is not constitutive but is triggered by stresses such as starvation. The algR2 (also termed algQ) gene has been previously identified as being necessary for mucoidy; an algR2(More)
Xanthomonas citri pv. citri is a clonal group of strains that causes citrus canker disease and appears to have originated in Asia. A phylogenetically distinct clonal group that causes identical disease symptoms on susceptible citrus, X. citri pv. aurantifolii, arose more recently in South America. Genomes of X. citri pv. aurantifolii strains carry two DNA(More)
Alginate is an important virulence factor for Pseudomonas aeruginosa during infection of the lungs of cystic fibrosis patients. The genes encoding enzymes for alginate production by P. aeruginosa are normally silent. They are activated in response to several environmental conditions, including high osmolarity, exposure to ethanol, or long-term growth under(More)
We have previously reported that two genes cloned from a cosmid library of Escherichia coli can restore mucoidy to an algR2 mutant of Pseudomonas aeruginosa. AlgR2 is a protein involved in the regulation of nucleoside diphosphate kinase (Ndk) as well as alginate synthesis in P. aeruginosa. One of the E. coli genes, rnk, encodes a 14.9 kDa protein with no(More)
BACKGROUND Lung cancer is a highly aggressive malignancy causing high morbidity and mortality. An increasing incidence of lung cancer has been observed in India. Currently, the classification of lung carcinoma has gone beyond small cell lung carcinoma and non-small cell lung carcinoma (NSCLC). Precise subtyping of poorly differentiated NSCLC into(More)