The Edwardsiella ictaluri O polysaccharide biosynthesis gene cluster and the role of O polysaccharide in resistance to normal catfish serum and catfish neutrophils

Article Abstract:

Research describes the cloning of the Edwardsiella ictaluri O polysaccharide biosynthesis gene cluster and gene mutation. Results show that the sequence region contains eight full and one incomplete open reading frames encoding enzymes involved in the lipopolysaccharide biosynthesis. Data indicate that wild-type Ed. ictaluri survives better than the mutants in normal catfish serum and catfish neutrophils.

Science & research, All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Polysaccharides, Physiological aspects, Microbiological synthesis, Cloning

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Expression of the nifA gene of Herbaspirillum seropedicae: role of the NtrC and nifA binding sites and of the -24/-12 promoter element

Article Abstract:

Expression of the nifA gene of Herbaspirillum seopedicae indicates that nifA transcription is activated by either NifA or NtrC proteins in association with sigma(sup)N factor. Data suggest that G residues at positions -26 and -9 and the region from -10 to +10 constitute the active nifA promoter.

United Kingdom, Brazil, Usage, DNA binding proteins, Mutagenesis, Nitrogen-fixing microorganisms

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Characterization of nirV and a gene encoding a novel pseudoazurin in Rhodobacter sphaeroides 2.4.3

Article Abstract:

Research elucidates the role played by pseudoazurin protein and nirV gene products in the nitrogen oxide reduction by Rhodobacter sphaeroides. Gene expression studies reveal that nirV is cotranscribed with another gene, nirK, as a part of the regulon NnrR.

Bacterial genetics, Denitrification, Nitrogen metabolism

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