Cloning of the glutamine synthetase gene from group B streptococci

Cloning, Expression, and Purification of Glutamine Synthetase from Clostridium acetobutylicum.

A glutamine synthetase (GS) gene, glnA, from the gram-positive obligate anaerobe Clostridium acetobutylicum was cloned on recombinant plasmid pHZ200 and enabled Escherichia coli glnA deletion mutants to utilize (NH(4))(2)SO(4) as a sole source of nitrogen. The cloned C. acetobutylicum gene was expressed from a regulatory region contained within the cloned DNA fragment. glnA expression was subje...

A glutamine transport gene, glnQ, is required for fibronectin adherence and virulence of group B streptococci.

Group B streptococci (GBS) are a leading cause of neonatal sepsis and meningitis. GBS adhere to fibronectin when it is attached to a solid phase. We isolated a Tn917 transposon mutant, COH1-GT1, which shows decreased adherence to fibronectin. COH1-GT1 also shows decreased adherence to and invasion of respiratory epithelial cells in vitro and decreased virulence in vivo. COH1-GT1 contains a Tn91...

Biochemical and molecular analysis of glutamine synthetase gene in brassica napus L.

Cloning and nucleotide sequence of the Butyrivibrio fibrisolvens gene encoding a type III glutamine synthetase.

A Butyrivibrio fibrisolvens glnA gene encoding glutamine synthetase (GS) was cloned on a recombinant plasmid pGS4 which enabled Escherichia coli glnA deletion mutants to utilize (NH4)2SO4 as a sole source of nitrogen. The nucleotide sequence of a 2423 bp DNA segment containing the GS-coding region of B. fibrisolvens was determined and the complete amino acid sequence (701 residues) was deduced....

Cloning and expression of the Thiobacillus ferrooxidans glutamine synthetase gene in Escherichia coli.

The glutamine synthetase (GS) gene glnA of Thiobacillus ferrooxidans was cloned on recombinant plasmid pMEB100 which enabled Escherichia coli glnA deletion mutants to utilize (NH4)2SO4 as the sole source of nitrogen. High levels of GS-specific activity were obtained in the E. coli glnA deletion mutants containing the T. ferrooxidans GS gene. The cloned T. ferrooxidans DNA fragment containing th...