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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1g79a_ All beta proteins Split barrel-like FMN-binding split barrel PNP-oxidase like Pyridoxine 5'-phoshate oxidase (PNP oxidase) (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyFMN-binding split barrel 8042082 3000856 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APutative_PNPOxe1g79A1 A: beta barrelsX: cradle loop barrelH: RIFT-relatedT: FMN-binding split barrelF: Putative_PNPOxECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A2.30.110.10 Mainly Beta Roll Pnp Oxidase Chain ACATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF10590Pyridoxine 5'-phosphate oxidase C-terminal dimerisation region (PNP_phzG_C)Pyridoxine 5'-phosphate oxidase C-terminal dimerisation regionThis domain represents one of the two dimerisation regions of the protein, located at the edge of the dimer interface, at the C-terminus, being the last three beta strands, S6, S7, and S8 along with the last three residues to the end. In Swiss:P21159 ...This domain represents one of the two dimerisation regions of the protein, located at the edge of the dimer interface, at the C-terminus, being the last three beta strands, S6, S7, and S8 along with the last three residues to the end. In Swiss:P21159, S6 runs from residues 178-192, S7 from 200-206 and S8 from 211-215. the extended loop, of residues 167-177 may well be involved in the pocket formed between the two dimers that positions the FMN molecule [1].To date, the only time functional oxidase or phenazine biosynthesis activities have been experimentally demonstrated is when the sequences contain both Pfam:PF01243 and Pfam:PF10590. It is unknown the role performed by each domain in bringing about molecular functions of either oxidase or phenazine activity [2].
Domain
PF01243Pyridoxamine 5'-phosphate oxidase (PNPOx_N)Pyridoxamine 5'-phosphate oxidaseThis entry includes pyridoxamine 5'-phosphate oxidases, FMN flavoproteins that catalyse the oxidation of pyridoxamine-5-P (PMP) and pyridoxine-5-P (PNP) to pyridoxal-5-P (PLP). This reaction serves as the terminal step in the de novo biosynthesis of ...This entry includes pyridoxamine 5'-phosphate oxidases, FMN flavoproteins that catalyse the oxidation of pyridoxamine-5-P (PMP) and pyridoxine-5-P (PNP) to pyridoxal-5-P (PLP). This reaction serves as the terminal step in the de novo biosynthesis of PLP in Escherichia coli and as a part of the salvage pathway of this coenzyme in both E. coli and mammalian cells [1-5]. The binding sites for FMN and for substrate have been highly conserved throughout evolution. In some species, the coenzyme F420 may perform the FMN role [7]. This entry represents the N-terminal segment of these proteins, which is involved in FMN binding when they form the dimer [5]. In human PNPO, it has been shown that this region contains some of the residues that constitute the PLP allosteric site which regulates its activity [4]. The C-terminal region of these proteins (Pfam:PF10590) is involved in dimerisation and also contributes some residues to the PLP allosteric site. Some of the members included in this entry are involved in phenazine biosynthesis [6].
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
PYRIDOXINE 5'-PHOSPHATE OXIDASE

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

ChainsEnzyme NameDescriptionCatalytic Residues
pyridoxal 5'-phosphate synthase  M-CSA #677

Escherichia coli pyridoxine 5'-phosphate oxidase is the enzyme catalysing the final step in the synthesis of pyridoxal 5'-phosphate, a vital cofactor in many metabolic processes including amino acid metabolism. This means that the synthetic pathway is of great importance to the survival of the bacteria. The enzyme is also present in higher organisms, and the Escherichia coli form is expected to show significant sequence and structural homology to the mammalian form. Of particular interest is the second binding site of PLP which protects the product of the reaction from release into the cell so it can be transferred directly onto the enzymes that require it.

Defined by 1 residue: ARG:A-197
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EC: 1.4.3.5 (PDB Primary Data)