The modE gene product mediates molybdenum-dependent expression of genes for the high-affinity molybdate transporter and modG in Azotobacter vinelandii

Article Abstract:

The molybdenum-dependent regulation of transcription of the operons of Azotobacter vinelandii, modEABC and modG, is mediated by the modE, the first gene in the modEABC operon. However, modE was not observed to have any control on the Mo-dependent expression of alternative nitrogenase structural genes. Mo accumulation of cells in the presence of molybdate were substantially reduced in a modE mutant, contrary to expectations of maximal rates of Mo transport with the constitutive expression of the high-affinity Mo-transport system.

Molybdenum

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Regulated interactions between partner and non-partner sensors and response regulators that control glycopeptide resistance gene expression in enterococci

Article Abstract:

The introduction of histidine to glutamine substitutions at positions 164 of VanS and 233 of VanSB was done to prevent the autophosphorylation of the sensor kinases and the transfer of the phosphate groups to the VanR and VanRB response regulators. The results showed that VanSH164Q and VanSBH233Q were responsible for the non-activation of VanRB and VanR by the host kinases. VanSH164Q prevented the transcription of resistance genes under all conditions and VanSBH233Q was negatively modulated by vancomycin.

Gene mutations, Gene mutation, Genetic transcription, Transcription (Genetics)

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The cydR gene product, required for regulation of cytochrome bd expression in the obligate aerobe Azobacter vinelandii, is an Fnr-like protein

Article Abstract:

The sequencing of the Tn5-B20 upstream resulted in the expression of the cydR gene. It was found that the Tn5-B20 insertions in MK8, MK15 and MK16 mutant were located in this gene. The cydr gene was also found homologous to Fnr, a global regulator of aerobic and anaerobic metabolism in Escherichia coli and to related proteins in other bacteria. Results suggest that the expression of cytochrome bd in Azotobacter vinelandii is under negative transcriptional control by CydR.

Bacteria, Cytochromes

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