1LR8

Crystal structure of Fs1, the heparin-binding domain of follistatin, complexed with the heparin analogue D-myo-inositol hexasulphate (Ins6S)

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	d1lr8a1	Small proteins	Knottins (small inhibitors, toxins, lectins)	EGF/Laminin	Follistatin (FS) module N-terminal domain, FS-N	Domain of follistatin	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)
A	d1lr8a2	Small proteins	Kazal-type serine protease inhibitors	Kazal-type serine protease inhibitors	Ovomucoid domain III-like	Domain of follistatin	Norway rat (Rattus norvegicus ) [TaxId: 10116 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Kazal-type serine protease inhibitors	8032571	3000605	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	EGF/Laminin-like	8032570	3000412	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	PF07648	e1lr8A1	A: few secondary structure elements	X: Kazal-type serine protease inhibitors-like	H: Kazal-type serine protease inhibitors (From Topology)	T: Kazal-type serine protease inhibitors	F: PF07648	ECOD (1.6)
A	PF09289	e1lr8A2	A: few secondary structure elements	X: EGF-like	H: EGF-related	T: EGF/Laminin	F: PF09289	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.60.30	Alpha Beta	2-Layer Sandwich	Wheat Germ Agglutinin (Isolectin 2)	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF09289	Follistatin/Osteonectin-like EGF domain (FOLN)	Follistatin/Osteonectin-like EGF domain	Members of this family are predominantly found in osteonectin and follistatin and adopt an EGF-like fold [1,2].	Domain
A	PF07648	Kazal-type serine protease inhibitor domain (Kazal_2)	Kazal-type serine protease inhibitor domain	Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containi ...	Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containing three disulphides.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Follistatin	protein-containing complex binding activin binding binding activin receptor antagonist activity molecular function inhibitor activity protein binding signaling receptor binding molecular function regulator activity signaling receptor inhibitor activity receptor antagonist activity signaling receptor regulator activity heparan sulfate proteoglycan binding proteoglycan binding carbohydrate derivative binding protein-containing complex binding activin binding binding activin receptor antagonist activity molecular function inhibitor activity protein binding signaling receptor binding molecular function regulator activity signaling receptor inhibitor activity receptor antagonist activity signaling receptor regulator activity heparan sulfate proteoglycan binding proteoglycan binding carbohydrate derivative binding sulfur compound binding	developmental process multicellular organism development multicellular organismal process anatomical structure development pattern specification process cellular developmental process cell differentiation cellular process cellular response to stimulus cellular response to BMP stimulus regulation of biological process cell surface receptor protein serine/threonine kinase signaling pathway regulation of cellular process cellular response to growth factor stimulus developmental process multicellular organism development multicellular organismal process anatomical structure development pattern specification process cellular developmental process cell differentiation cellular process cellular response to stimulus cellular response to BMP stimulus regulation of biological process cell surface receptor protein serine/threonine kinase signaling pathway regulation of cellular process cellular response to growth factor stimulus cell surface receptor signaling pathway response to stimulus signaling response to endogenous stimulus biological regulation cell communication cellular response to endogenous stimulus response to BMP transforming growth factor beta receptor superfamily signaling pathway signal transduction response to growth factor BMP signaling pathway enzyme-linked receptor protein signaling pathway sexual reproduction reproductive process multicellular organismal reproductive process gamete generation activin receptor signaling pathway negative regulation of signaling regulation of transmembrane receptor protein serine/threonine kinase signaling pathway negative regulation of biological process regulation of signal transduction negative regulation of cell communication negative regulation of activin receptor signaling pathway negative regulation of cellular process regulation of signaling negative regulation of response to stimulus negative regulation of signal transduction regulation of response to stimulus regulation of cell communication regulation of activin receptor signaling pathway negative regulation of transmembrane receptor protein serine/threonine kinase signaling pathway anatomical structure morphogenesis odontogenesis of dentin-containing tooth odontogenesis animal organ development animal organ morphogenesis skeletal system development system development cell population proliferation epithelial cell proliferation keratinocyte proliferation regulation of developmental process regulation of cell differentiation epithelial cell differentiation regulation of epithelial cell differentiation regulation of multicellular organismal process negative regulation of cell differentiation epithelium development regulation of multicellular organismal development negative regulation of epithelial cell differentiation negative regulation of developmental process tissue development epidermis development molting cycle process hair cycle epidermis morphogenesis morphogenesis of an epithelium tissue morphogenesis skin development skin epidermis development hair follicle development molting cycle hair cycle process hair follicle morphogenesis regulation of BMP signaling pathway regulation of cellular response to growth factor stimulus positive regulation of biological process regulation of hair cycle positive regulation of developmental process positive regulation of hair follicle development regulation of hair follicle development positive regulation of multicellular organismal process regulation of localization system process regulation of system process negative regulation of transport negative regulation of follicle-stimulating hormone secretion localization negative regulation of secretion negative regulation of hormone secretion negative regulation of secretion by cell regulation of biological quality regulation of hormone levels follicle-stimulating hormone secretion establishment of localization regulation of secretion endocrine hormone secretion negative regulation of gonadotropin secretion negative regulation of multicellular organismal process regulation of endocrine process regulation of hormone secretion gonadotropin secretion transport hormone secretion secretion by cell regulation of secretion by cell signal release regulation of follicle-stimulating hormone secretion secretion regulation of transport regulation of gonadotropin secretion cell-cell signaling export from cell endocrine process hormone transport hemopoiesis cell development hematopoietic progenitor cell differentiation negative regulation of cellular metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II organic substance biosynthetic process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of transcription by RNA polymerase II negative regulation of DNA-templated transcription negative regulation of transcription by RNA polymerase II cellular metabolic process negative regulation of metabolic process primary metabolic process regulation of cellular metabolic process negative regulation of cellular biosynthetic process organic cyclic compound metabolic process regulation of gene expression biosynthetic process negative regulation of macromolecule biosynthetic process organic cyclic compound biosynthetic process metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic process cellular biosynthetic process RNA metabolic process RNA biosynthetic process nucleic acid biosynthetic process organic substance metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process negative regulation of biosynthetic process response to organic substance response to chemical response to organic cyclic compound ameloblast differentiation columnar/cuboidal epithelial cell differentiation gonad development reproductive system development female gonad development sex differentiation female sex differentiation development of primary female sexual characteristics developmental process involved in reproduction development of primary sexual characteristics reproductive structure development	intracellular anatomical structure cytoplasm cellular anatomical entity extracellular region extracellular space membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR015369	Follistatin/Osteonectin EGF domain	Domain
A	IPR036058	Kazal domain superfamily	Homologous Superfamily
A	IPR002350	Kazal domain	Domain
A	IPR003645	Follistatin-like, N-terminal	Domain
A	IPR036773	TGF-beta binding (TB) domain superfamily	Homologous Superfamily
A	IPR017878	TB 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.