Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AHTH_AraCe4fe7A5 A: alpha arraysX: HTHH: HTHT: tri-helicalF: HTH_AraCECOD (1.6)
APeripla_BP_3e4fe7A1 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: Periplasmic binding protein-like IF: Peripla_BP_3ECOD (1.6)
APBP1_XylRe4fe7A6 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: Periplasmic binding protein-like IF: PBP1_XylRECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.40.50.2300 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold Response regulatorCATH (4.3.0)
A1.10.10.60 Mainly Alpha Orthogonal Bundle Arc Repressor Mutant, subunit A Homeodomain-likeCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF22177XylR N-terminal domain (PBP1_XylR)XylR N-terminal domainThis entry represents the N-terminal domain of XylR, an atypical AraC protein. This D-xylose-binding domain contains a periplasmic-binding protein (PBP) fold, similar to LacI/GalR transcription regulators, and mediates dimerization [1].Domain
PF00165Bacterial regulatory helix-turn-helix proteins, AraC family (HTH_AraC)Bacterial regulatory helix-turn-helix proteins, AraC familyIn 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].
Domain
PF13377Periplasmic binding protein-like domain (Peripla_BP_3)Periplasmic binding protein-like domainThis domain is found in a variety of transcriptional regulatory proteins. It is related to bacterial periplasmic binding proteins, although this domain is unlikely to be found in the periplasm. This domain acts as a sensor binding small molecule liga ...This domain is found in a variety of transcriptional regulatory proteins. It is related to bacterial periplasmic binding proteins, although this domain is unlikely to be found in the periplasm. This domain acts as a sensor binding small molecule ligands that the DNA-binding domain responds to. This domain recognises Sugars, sugar phosphates, sugar acids and purines (Matilla et. al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043).
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
Xylose operon regulatory protein -