Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad5fita_ Alpha and beta proteins (a+b) HIT-like HIT-like HIT (HINT, histidine triad) family of protein kinase-interacting proteins FHIT (fragile histidine triad protein) human (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyHIT-like 8034371 3000223 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AHITe5fitA1 A: a+b three layersX: HIT-likeH: HIT-related (From Topology)T: HIT-relatedF: HITECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.30.428.10 Alpha Beta 2-Layer Sandwich HIT family, subunit A HIT-likeCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF01230HIT domain (HIT)HIT domain- Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
FRAGILE HISTIDINE TRIAD PROTEIN

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
bis(5'-adenosyl)-triphosphatase  M-CSA #101

The FHIT protein is a diadenosine P1, P3-triphosphate (ApppA) hydrolase that cleaves diadenosine P1, P3-triphosphate to yield AMP and ADP which is found in animals and fungi. In humans the FHIT gene is found at 3p14.2 and is thought to act as a tumour suppressor gene involved in many human cancers. It belongs to one branch of the Histidine triad (HIT) superfamily of nucleotide-binding proteins which have a conserved His-X-His-X-His-X-X (where X is a hydrophobic amino acid) motif. This was originally thought to be a zinc-ion binding site but is now believed to be the alpha-phosphate binding site [PMID:9323207]. The other branch of this superfamily consists of the HINT (histidine triad nucleotide-binding) proteins, the proposed ancestor of FHIT, galactose-1-phosphate uridylyltransferase, and other nucleotide binding proteins [PMID:9323207].

Dinocleoside polyphoshate hydrolases require millimolar Mn(II) Mg(II) or Ca(II) for optimum activity and are inhibited by Ni(II) Zn(II) and Cd(II).

Defined by 4 residues: GLN:A-83HIS:A-94HIS:A-96HIS:A-98
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