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Updated: May 10, 2026

Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling
Published on: June 25, 2015
[The C-terminus of transcription factor TnrA from Bacillus subtilis controls DNA-binding domain activity but is not
Abstract:
The transcription factor ThrA, which belongs to the MerR transcription regulators, in Bacillus subtilis cells controls genes of nitrogen metabolism under conditions of nitrogen limitation. As all the DNA-binding proteins, it is present as a dimer in cells, but the dimerization site is still unknown. The multiple alignment of TnrA homologs from the other Bacilli allowed to identify the putative dimerization sites. Using the C-terminal truncated TnrA proteins it is established, that, in contrast to other MerR-proteins, the TnrA C-terminus does not participate in dimerization. The surface plasmon resonance has revealed that C-terminus truncations of TnrA do not inactivate its DNA-binding activity. By contrary, it increased an affinity to DNA, confirming that C-terminus controls the DNA-binding activity in a full-length TnrA.
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