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Crystal structure of the heme domain of flavocytochrome b2 in complex with Fab B2B4 External Resource: Annotation Chains Type Family Name Domain Identifier Family Identifier Provenance Source (Version) F [auth B] SCOP2B Superfamily Cytochrome b5-like heme/steroid binding domain 8003822 3000073 SCOP2B (2022-06-29) C [auth A] SCOP2B Superfamily Cytochrome b5-like heme/steroid binding domain 8003822 3000073 SCOP2B (2022-06-29)
Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) F [auth B] Cytochrome_CBB3 e3ks0B1 A: alpha arrays X: Alpha-beta plaits H: Phage tail protein-like T: Transmembrane protein 14A F: Cytochrome_CBB3 ECOD (v295.2) C [auth A] Col-Pyo_DNase e3ks0A1 A: alpha arrays X: Immunoglobulin-like beta-sandwich H: DEATH domain T: DEATH domain F: Col-Pyo_DNase ECOD (v295.2) E [auth K] Cytochrome_CBB3 e3ks0K1 A: alpha arrays X: Alpha-beta plaits H: Phage tail protein-like T: Transmembrane protein 14A F: Cytochrome_CBB3 ECOD (v295.2) B [auth H] Col-Pyo_DNase e3ks0H1 A: alpha arrays X: Immunoglobulin-like beta-sandwich H: DEATH domain T: DEATH domain F: Col-Pyo_DNase ECOD (v295.2) D [auth J] Cytochrome_CBB3 e3ks0J1 A: alpha arrays X: Alpha-beta plaits H: Phage tail protein-like T: Transmembrane protein 14A F: Cytochrome_CBB3 ECOD (v295.2) A [auth L] MAPEG e3ks0L1 A: alpha arrays X: Immunoglobulin-like beta-sandwich H: MAPEG domain-like T: MAPEG domain-like F: MAPEG ECOD (v295.2)
Chain Protein Name Description Organism Name Gene Allele Name(s) Domain Name(s) Receptor Type Receptor Description Provenance Source B [auth H] ,E [auth K] Fab B2B4 VH-CH1 Mus musculus (house mouse) IGHV3-8*02, IGHJ2*01, IGHG1*02 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_LAMBDA IMGT (202637-0) A [auth L] ,D [auth J] Fab B2B4 L-LAMBDA Mus musculus (house mouse) IGLV1*01, IGLJ1*01, IGLC1*01 V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA IG FAB-GAMMA-1_LAMBDA IMGT (202637-0)
Chain Chain Class Chain Subclass Chain Type Antigen Name(s) Provenance Source B [auth H] ,E [auth K] Heavy Chain IGHV3 - cytochrome b2, mitochondrial SAbDab (2026-09-25) A [auth L] ,D [auth J] Light Chain IGLV1 Lambda cytochrome b2, mitochondrial SAbDab (2026-09-25)
Chains Accession Name Description Comments Source C [auth A] ,F [auth B] PF00173 Cytochrome b5-like Heme/Steroid binding domain (Cyt-b5) Cytochrome b5-like Heme/Steroid binding domain This family includes heme binding domains from a diverse range of proteins. This family also includes proteins that bind to steroids. The family includes progesterone receptors such as Swiss:O00264 [1,2]. Many members of this subfamily are membrane a ... This family includes heme binding domains from a diverse range of proteins. This family also includes proteins that bind to steroids. The family includes progesterone receptors such as Swiss:O00264 [1,2]. Many members of this subfamily are membrane anchored by an N-terminal transmembrane alpha helix. This family also includes a domain in some chitin synthases. There is no known ligand for this domain in the chitin synthases. Domain
Chains Accession Name Type C [auth A] ,F [auth B] IPR036400 Cytochrome b5-like heme/steroid binding domain superfamily Homologous Superfamily C [auth A] ,F [auth B] IPR018506 Cytochrome b5, heme-binding site Binding Site C [auth A] ,F [auth B] IPR037458 L-mandelate/L-lactate dehydrogenase, FMN-binding domain Domain C [auth A] ,F [auth B] IPR013785 Aldolase-type TIM barrel Homologous Superfamily C [auth A] ,F [auth B] IPR000262 FMN-dependent dehydrogenase Domain C [auth A] ,F [auth B] IPR008259 FMN-dependent alpha-hydroxy acid dehydrogenase, active site Active Site C [auth A] ,F [auth B] IPR001199 Cytochrome b5-like heme/steroid binding domain Domain C [auth A] ,F [auth B] IPR037396 FMN hydroxy acid dehydrogenase domain Domain