3X35

Crystal structure of the reduced form of the solubilized domain of porcine cytochrome b5 in form 2 crystal

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d3x35a_	Alpha and beta proteins (a+b)	Cytochrome b5-like heme/steroid binding domain	Cytochrome b5-like heme/steroid binding domain	Cytochrome b5	automated matches	Pig (Sus scrofa ) [TaxId: 9823 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Cytochrome b5-like heme/steroid binding domain	8068619	3000073	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Cyt-b5	e3x35A1	A: a+b two layers	X: Cystatin-like	H: Cytochrome b5-like heme/steroid binding domain (From Topology)	T: Cytochrome b5-like heme/steroid binding domain	F: Cyt-b5	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.10.120.10	Alpha Beta	Roll	Flavocytochrome B2	Chain A, domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Cytochrome b5	binding organic cyclic compound binding tetrapyrrole binding heme binding cation binding ion binding metal ion binding small molecule binding	-	membrane-bounded organelle intracellular anatomical structure mitochondrial membrane mitochondrion membrane organelle outer membrane cellular anatomical entity intracellular membrane-bounded organelle intracellular organelle organelle envelope bounding membrane of organelle organelle mitochondrial envelope mitochondrial outer membrane membrane-bounded organelle intracellular anatomical structure mitochondrial membrane mitochondrion membrane organelle outer membrane cellular anatomical entity intracellular membrane-bounded organelle intracellular organelle organelle envelope bounding membrane of organelle organelle mitochondrial envelope mitochondrial outer membrane outer membrane cytoplasm organelle membrane organelle subcompartment endomembrane system endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR036400	Cytochrome b5-like heme/steroid binding domain superfamily	Homologous Superfamily
A	IPR018506	Cytochrome b5, heme-binding site	Binding Site
A	IPR001199	Cytochrome b5-like heme/steroid binding domain	Domain
A	IPR050668	Cytochrome b5	Family

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.