Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyN-terminal (heme c) domain of cytochrome cd1-nitrite reductase 8024119 4000654 SCOP2 (2022-06-29)
ASCOP2 FamilyC-terminal (heme d1) domain of cytochrome cd1-nitrite reductase 8030492 4002629 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyCytochrome c 8036498 3000815 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyC-terminal (heme d1) domain of cytochrome cd1-nitrite reductase 8042871 3001509 SCOP2 (2022-06-29)
BSCOP2B SuperfamilyCytochrome c 8036498 3000815 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyC-terminal (heme d1) domain of cytochrome cd1-nitrite reductase 8042871 3001509 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ACytochrom_D1e1nirA3 A: beta duplicates or obligate multimersX: beta-propeller-likeH: beta-propellerT: 8-bladedF: Cytochrom_D1ECOD (1.6)
ACytochrome_CBB3e1nirA4 A: alpha arraysX: Cytochrome c-likeH: Cytochrome c (From Topology)T: Cytochrome cF: Cytochrome_CBB3ECOD (1.6)
BCytochrom_D1e1nirB3 A: beta duplicates or obligate multimersX: beta-propeller-likeH: beta-propellerT: 8-bladedF: Cytochrom_D1ECOD (1.6)
BCytochrome_CBB3e1nirB4 A: alpha arraysX: Cytochrome c-likeH: Cytochrome c (From Topology)T: Cytochrome cF: Cytochrome_CBB3ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A1.10.760.10 Mainly Alpha Orthogonal Bundle Cytochrome Bc1 Complex Chain D, domain 2CATH (4.3.0)
A2.140.10.20 Mainly Beta 8 Propeller Methanol Dehydrogenase Chain ACATH (4.3.0)
B1.10.760.10 Mainly Alpha Orthogonal Bundle Cytochrome Bc1 Complex Chain D, domain 2CATH (4.3.0)
B2.140.10.20 Mainly Beta 8 Propeller Methanol Dehydrogenase Chain ACATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF02239Cytochrome D1 heme domain (Cytochrom_D1)Cytochrome D1 heme domain- Repeat
A, B
PF13442Cytochrome C oxidase, cbb3-type, subunit III (Cytochrome_CBB3)Cytochrome C oxidase, cbb3-type, subunit III- Domain

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

ChainsEnzyme NameDescriptionCatalytic Residues
nitrite reductase (cytochrome cd1 type)  M-CSA #903

Cytochrome cd1 (cyt cd1) nitrite reductase is a dimeric enzyme of the bacterial periplasm that plays a key role in denitrification, the respiratory reduction of nitrite to nitric oxide in the nitrogen cycle. Each subunit of the cyt cd1 dimer contains one cytochrome c and one d1 haem group [PMID:12556530]. The active site contains a specialised d1 haem, where the nitrite substrate is bound and reduced. This d1 haem is bound in an 8-bladed beta-propeller, which is also found in some members of the WD40 repeat-containing proteins (IPR001680).

Defined by 6 residues: CYS:A-47CYS:A-50HIS:A-51MET:A-88HIS:A-327HIS:A-369
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