6W1B

N-terminal domain of mouse surfactant protein B with bound lipid, Y59A/H79A mutant

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
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	d6w1ba_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
B [auth E]	d6w1be_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C [auth B]	d6w1bb_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
D [auth C]	d6w1bc_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
E [auth D]	d6w1bd_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
F	d6w1bf_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
G	d6w1bg_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
H	d6w1bh_	All alpha proteins	Saposin-like	Saposin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF03489,PF05184	e6w1bA1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
B [auth E]	PF03489,PF05184	e6w1bE1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
C [auth B]	PF03489,PF05184	e6w1bB1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
D [auth C]	PF03489,PF05184	e6w1bC1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
E [auth D]	PF03489,PF05184	e6w1bD1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
F	PF03489,PF05184	e6w1bF1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
G	PF03489,PF05184	e6w1bG1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)
H	PF03489,PF05184	e6w1bH1	A: alpha arrays	X: Saposin-like	H: Saposin-like (From Topology)	T: Saposin-like	F: PF03489,PF05184	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	PF05184	Saposin-like type B, region 1 (SapB_1)	Saposin-like type B, region 1	Saposin B is a small non-enzymatic glycoprotein required for the breakdown of cerebroside sulphates (sulphatides) in lysosomes. Saposin B contains three intramolecular disulphide bridges, exists as a dimer and is remarkably heat, protease, and pH sta ...	Saposin B is a small non-enzymatic glycoprotein required for the breakdown of cerebroside sulphates (sulphatides) in lysosomes. Saposin B contains three intramolecular disulphide bridges, exists as a dimer and is remarkably heat, protease, and pH stable. The crystal structure of human saposin B reveals an unusual shell-like dimer consisting of a monolayer of alpha-helices enclosing a large hydrophobic cavity [1,2]. It is one of the most studied members of the saposin protein family and it is involved in the hydrolysis of glycolipids and glycerolipids. SapB is unique in the saposin family in that it facilitates degradation by interacting with the substrate, not the enzymes [3].	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	PF03489	Saposin-like type B, region 2 (SapB_2)	Saposin-like type B, region 2	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	Pulmonary surfactant-associated protein B	-	membrane lipid metabolic process organonitrogen compound metabolic process organic substance metabolic process cellular metabolic process cellular lipid metabolic process sphingolipid metabolic process metabolic process primary metabolic process cellular process lipid metabolic process multicellular organismal process respiratory gaseous exchange by respiratory system	membrane-bounded organelle intracellular anatomical structure intracellular vesicle cellular anatomical entity intracellular membrane-bounded organelle endomembrane system intracellular organelle lamellar body cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle membrane-bounded organelle intracellular anatomical structure intracellular vesicle cellular anatomical entity intracellular membrane-bounded organelle endomembrane system intracellular organelle lamellar body cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle alveolar lamellar body cell periphery extracellular matrix external encapsulating structure collagen-containing extracellular matrix extracellular region extracellular space endosome late endosome multivesicular body lytic vacuole vacuole lysosome

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	IPR011001	Saposin-like	Homologous Superfamily
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	IPR008373	Saposin	Family
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	IPR007856	Saposin-like type B, region 1	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	IPR008139	Saposin B type domain	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	IPR008138	Saposin B type, region 2	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D], A, B [auth E], C [auth B], D [auth C], E [auth D], F, G, H	IPR003119	Saposin A-type domain	Domain

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 R01GM133198.