Protein Family Models

Date:

2024-08-14

This family represents the arabinose-binding and dimerisation domain of the bacterial gene regulatory protein AraC. The domain is found in conjunction with the helix-turn-helix (HTH) DNA-binding motif Pfam:PF00165. This domain is distantly related to the Cupin domain Pfam:PF00190. [1]. 9103202. Structural basis for ligand-regulated oligomerization of AraC. Soisson SM, MacDougall-Shackleton B, Schleif R, Wolberger C;. Science 1997;276:421-425. (from Pfam)

Date:

2024-10-16

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]. [1]. 9600836. Apo-AraC actively seeks to loop. Seabold RR, Schleif RF;. J Mol Biol 1998;278:529-538. [2]. 9600837. Arm-domain interactions in AraC. Saviola B, Seabold R, Schleif RF;. J Mol Biol 1998;278:539-548. (from Pfam)

Date:

2024-10-16

HTH-type transcriptional activator RhaS is an AraC family transcriptional regulator that controls the expression of one or many genes with potentially diverse biological functions including metabolism, stress response, and virulence

Date:

2017-09-14

Gene:

rhaS

Date:

2021-11-04