Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
BSCOP2B SuperfamilyHeme oxygenase-like 8072972 3001676 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyHeme oxygenase-like 8072972 3001676 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyHeme oxygenase-like 8072972 3001676 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
BHeme_oxygenasee1wnwB1 A: alpha bundlesX: Ferritin/Heme oxygenase/4-helical cytokinesH: Ferritin/Heme oxygenaseT: Heme oxygenase/Ribonucleotide reductaseF: Heme_oxygenaseECOD (1.6)
CHeme_oxygenasee1wnwC1 A: alpha bundlesX: Ferritin/Heme oxygenase/4-helical cytokinesH: Ferritin/Heme oxygenaseT: Heme oxygenase/Ribonucleotide reductaseF: Heme_oxygenaseECOD (1.6)
AHeme_oxygenasee1wnwA1 A: alpha bundlesX: Ferritin/Heme oxygenase/4-helical cytokinesH: Ferritin/Heme oxygenaseT: Heme oxygenase/Ribonucleotide reductaseF: Heme_oxygenaseECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
B1.20.910.10 Mainly Alpha Up-down Bundle Heme Oxygenase Chain ACATH (4.3.0)
C1.20.910.10 Mainly Alpha Up-down Bundle Heme Oxygenase Chain ACATH (4.3.0)
A1.20.910.10 Mainly Alpha Up-down Bundle Heme Oxygenase Chain ACATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C
PF01126Heme oxygenase (Heme_oxygenase)Heme oxygenase- Domain

InterPro: Protein Family Classification InterPro Database Homepage

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

ChainsEnzyme NameDescriptionCatalytic Residues
heme oxygenase (biliverdin-producing)  M-CSA #795

Heme oxygenase (HO) catalyses the breakdown of heme to release biliverdin, CO, and free iron, and is found in mammals, plants and photosynthetic bacteria. The roles of the heme catabolism process are different in mammals and plants: whilst mammals use HO to degrade excess heme from red blood cells, plants and cyanobacteria use HO activity in order to generate the biliverdin needed for the production of light harvesting complexes. As a result, their is little sequence or structural homology between the mammalian and other forms, indicating that they may have evolved independently. However, the reaction seems to proceed via the same mechanism in both, with key active site residues being the same between the two groups. The bacterial form is described here, but the catalytic residues are the same in both the mammalian and plant forms of the enzyme.

Defined by 7 residues: HIS:B-25TYR:B-53VAL:B-131ARG:B-132GLY:B-135ASN:B-136GLY:B-140
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