AraC-type arabinose-binding/dimerisation domain (IPR003313)

Short name: AraC-bd

Overlapping homologous superfamilies

Domain relationships



This entry defines the ligand-binding and dimerisation domain of the bacterial regulatory protein AraC and other HTH-type transcriptional regulators. The crystal structure of the arabinose-binding and dimerisation domain of the Escherichia coli gene regulatory protein AraC was determined in the presence and absence of L-arabinose. The arabinose-bound molecule shows that the protein adopts an unusual fold, binding sugar within a beta barrel and completely burying the arabinose with the amino-terminal arm of the protein. Dimer contacts in the presence of arabinose are mediated by an antiparallel coiled-coil. In the uncomplexed protein, the amino-terminal arm is disordered, uncovering the sugar-binding pocket and allowing it to serve as an oligomerization interface [PMID: 9103202].

GO terms

Biological Process

GO:0006355 regulation of transcription, DNA-templated

Molecular Function

No terms assigned in this category.

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.