Bacterial regulatory helix-turn-helix proteins, AraC family
In the absence of arabinose, the N-terminal arm of AraC binds to the DNA binding domain (Pfam:PF00165) and helps to hold the two DNA binding domains in a relative orientation that favours DNA looping. In the presence of arabinose, the arms bind ove ...
In the absence of arabinose, the N-terminal arm of AraC binds to the DNA binding domain (Pfam:PF00165) and helps to hold the two DNA binding domains in a relative orientation that favours DNA looping. In the presence of arabinose, the arms bind over the arabinose on the dimerisation domain, thus freeing the DNA-binding domains. The freed DNA-binding domains are then able to assume a conformation suitable for binding to the adjacent DNA sites that are utilised when AraC activates transcription, and hence AraC ceases looping the DNA when arabinose is added [1-2].
This entry represents a cupin-like domain present in ToxT from Vibrio Cholerae [1,2]. ToxT serves as the culminating factor in the regulatory pathway, ensuring the coordinated production of two virulence factors: the toxin-coregulated pilus (TCP) an ...
This entry represents a cupin-like domain present in ToxT from Vibrio Cholerae [1,2]. ToxT serves as the culminating factor in the regulatory pathway, ensuring the coordinated production of two virulence factors: the toxin-coregulated pilus (TCP) and cholera toxin (CT), which are crucial for the pathogenicity of V. cholerae in causing cholera. ToxT possesses dimerization and regulatory elements in its cupin-like N-terminal domain, while its C-terminus harbors two HTH AraC-like DNA binding domains [3,4].
