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

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyHIT-like 8034400 3000223 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyHIT-like 8034403 3000223 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyHIT-like 8034400 3000223 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyHIT-like 8034403 3000223 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AGalP_UDP_transfe1hxqA1 A: a+b three layersX: HIT-likeH: HIT-related (From Topology)T: HIT-relatedF: GalP_UDP_transfECOD (1.6)
AGalP_UDP_tr_Ce1hxqA2 A: a+b three layersX: HIT-likeH: HIT-related (From Topology)T: HIT-relatedF: GalP_UDP_tr_CECOD (1.6)
BGalP_UDP_transfe1hxqB1 A: a+b three layersX: HIT-likeH: HIT-related (From Topology)T: HIT-relatedF: GalP_UDP_transfECOD (1.6)
BGalP_UDP_tr_Ce1hxqB2 A: a+b three layersX: HIT-likeH: HIT-related (From Topology)T: HIT-relatedF: GalP_UDP_tr_CECOD (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)
B3.30.428.10 Alpha Beta 2-Layer Sandwich HIT family, subunit A HIT-likeCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF01087Galactose-1-phosphate uridyl transferase, N-terminal domain (GalP_UDP_transf)Galactose-1-phosphate uridyl transferase, N-terminal domainSCOP reports fold duplication with C-terminal domain. Both involved in Zn and Fe binding.Domain
A, B
PF02744Galactose-1-phosphate uridyl transferase, C-terminal domain (GalP_UDP_tr_C)Galactose-1-phosphate uridyl transferase, C-terminal domainSCOP reports fold duplication with N-terminal domain. Both involved in Zn and Fe binding.Domain

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

ChainsEnzyme NameDescriptionCatalytic Residues
UDP-glucose-hexose-1-phosphate uridylyltransferase  M-CSA #88

Nucleotidyltransferases catalyse the covalent modification of a variety of biological molecules. These reactions are crucial for the synthesis of coenzymes, cyclic nucleotides, polynucleotides, and nucleotide sugars. These reactions involve substitutions at the R -phosphorus of a nucleotidyl donor substrate and result in displacement of a phosphoryl ester or pyrophosphate. Substrates for such reactions may include nucleoside di- or triphosphates, as well as nucleotide sugars, such as UDP-Glc. Galactose-1-phosphate uridylyltransferase (hexose-1-phosphate uridylyltransferase) catalyses the exchange of the UMP moiety between the hexose 1-phosphates of Glc and Gal and their corresponding UDP-sugar. The enzyme is distinct among nucleotidyl transferases that use phosphates as acceptor groups in that it is the only one that does not utilise nucleoside di- or triphosphates as the nucleotidyl donor substrate. The reaction is part of the Leloir pathway of galactose metabolism required for the normal equilibration of UDP-hexoses among most organisms. Deficiencies in uridylyltransferase activity culminate in the metabolic disease galactosemia, which occurs as an autosomal recessive trait.

Defined by 8 residues: CYS:A-52CYS:A-55HIS:A-115ASN:A-153SER:A-161HIS:A-164HIS:A-166GLN:A-168
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