Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyLigA subunit of an aromatic-ring-opening dioxygenase LigAB 8025700 4001114 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyLigA subunit of an aromatic-ring-opening dioxygenase LigAB 8038079 3000805 SCOP2 (2022-06-29)
CSCOP2B SuperfamilyLigA subunit of an aromatic-ring-opening dioxygenase LigAB 8038079 3000805 SCOP2B (2022-06-29)
BSCOP2 FamilyLigB-like 8019828 4000592 SCOP2 (2022-06-29)
BSCOP2 SuperfamilyLigB-like 8032208 3000690 SCOP2 (2022-06-29)
DSCOP2B SuperfamilyLigB-like 8032208 3000690 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ALigAe1bouA1 A: alpha arraysX: LigA subunit of an aromatic-ring-opening dioxygenase LigAB (From Topology)H: LigA subunit of an aromatic-ring-opening dioxygenase LigAB (From Topology)T: LigA subunit of an aromatic-ring-opening dioxygenase LigABF: LigAECOD (1.6)
CLigAe1bouC1 A: alpha arraysX: LigA subunit of an aromatic-ring-opening dioxygenase LigAB (From Topology)H: LigA subunit of an aromatic-ring-opening dioxygenase LigAB (From Topology)T: LigA subunit of an aromatic-ring-opening dioxygenase LigABF: LigAECOD (1.6)
BLigBe1bouB1 A: a/b three-layered sandwichesX: LigB-like (From Topology)H: LigB-like (From Topology)T: LigB-likeF: LigBECOD (1.6)
DLigBe1bouD1 A: a/b three-layered sandwichesX: LigB-like (From Topology)H: LigB-like (From Topology)T: LigB-likeF: LigBECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A1.10.700.10 Mainly Alpha Orthogonal Bundle Protocatechuate 4,5-dioxygenase Chain ACATH (4.3.0)
C1.10.700.10 Mainly Alpha Orthogonal Bundle Protocatechuate 4,5-dioxygenase Chain ACATH (4.3.0)
B3.40.830.10 Alpha Beta 3-Layer(aba) Sandwich Protocatechuate 4,5-dioxygenase Chain BCATH (4.3.0)
D3.40.830.10 Alpha Beta 3-Layer(aba) Sandwich Protocatechuate 4,5-dioxygenase Chain BCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, C
PF07746Aromatic-ring-opening dioxygenase LigAB, LigA subunit (LigA)Aromatic-ring-opening dioxygenase LigAB, LigA subunit- Family
B, D
PF02900Catalytic LigB subunit of aromatic ring-opening dioxygenase (LigB)Catalytic LigB subunit of aromatic ring-opening dioxygenase- Domain

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

ChainsEnzyme NameDescriptionCatalytic Residues
protocatechuate 4,5-dioxygenase  M-CSA #672

The LigAB enzyme from Sphingomonas paucimobilis SYK-6 is a protocatechuate 4,5-dioxygenase, catalyses the ring-opening of protocatechuate (PCA) by oxidation to cleave the C4-C5 bond adjacent to the vicinal hydroxyl group. It belongs to the family of class III extradiol-type catecholic dioxygenase which is characterised by a ferrous iron in the active site. It has been identified as a key enzyme in the lignin-degradation pathway of Sphingomonas paucimobilis SYK-6.

Defined by 4 residues: HIS:B-12HIS:B-61HIS:B-195GLU:B-242
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