1POS | pdb_00001pos

CRYSTAL STRUCTURE OF A NOVEL DISULFIDE-LINKED "TREFOIL" MOTIF FOUND IN A LARGE FAMILY OF PUTATIVE GROWTH FACTORS

External Resource: Annotation

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

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1posa1	Small proteins	Trefoil/Plexin domain-like	Trefoil	Trefoil	Pancreatic spasmolytic polypeptide	pig (Sus scrofa ) [TaxId: 9823 ],	SCOPe (2.08)
B	d1posb1	Small proteins	Trefoil/Plexin domain-like	Trefoil	Trefoil	Pancreatic spasmolytic polypeptide	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	Trefoil	8038720	3000849	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Trefoil	8038718	3000849	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Trefoil	8038720	3000849	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Trefoil	8038718	3000849	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	Trefoil	e1posA1	A: few secondary structure elements	X: Trefoil/Plexin domain-like (From Topology)	H: Trefoil/Plexin domain-like (From Topology)	T: Trefoil/Plexin domain-like	F: Trefoil	ECOD (1.6)
B	Trefoil	e1posB1	A: few secondary structure elements	X: Trefoil/Plexin domain-like (From Topology)	H: Trefoil/Plexin domain-like (From Topology)	T: Trefoil/Plexin domain-like	F: Trefoil	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00088	Trefoil (P-type) domain (Trefoil)	Trefoil (P-type) domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PORCINE PANCREATIC SPASMOLYTIC POLYPEPTIDE	protein binding binding signaling receptor binding cytokine receptor binding CXCR4 chemokine receptor binding CXCR chemokine receptor binding G protein-coupled receptor binding chemokine receptor binding molecular transducer activity molecular function activator activity signaling receptor activity growth factor activity signaling receptor activator activity molecular function regulator activity protein binding binding signaling receptor binding cytokine receptor binding CXCR4 chemokine receptor binding CXCR chemokine receptor binding G protein-coupled receptor binding chemokine receptor binding molecular transducer activity molecular function activator activity signaling receptor activity growth factor activity signaling receptor activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity	multicellular organismal process maintenance of gastrointestinal epithelium system process digestion multicellular organismal-level homeostasis epithelial structure maintenance homeostatic process digestive system process anatomical structure homeostasis tissue homeostasis cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus multicellular organismal process maintenance of gastrointestinal epithelium system process digestion multicellular organismal-level homeostasis epithelial structure maintenance homeostatic process digestive system process anatomical structure homeostasis tissue homeostasis cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus cell surface receptor signaling pathway signaling biological regulation response to cytokine response to chemokine cytokine-mediated signaling pathway cellular response to chemokine chemokine-mediated signaling pathway cell communication response to peptide response to chemical G protein-coupled receptor signaling pathway cellular process cellular response to cytokine stimulus signal transduction regulation of localization transport regulation of system process negative regulation of biological process negative regulation of transport localization negative regulation of secretion regulation of multicellular organismal process negative regulation of digestive system process regulation of gastric acid secretion regulation of transport secretion acid secretion regulation of digestive system process establishment of localization gastric acid secretion regulation of secretion negative regulation of multicellular organismal process negative regulation of gastric acid secretion	cellular anatomical structure extracellular region extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR044913	P-type trefoil domain superfamily	Homologous Superfamily
A, B	IPR017994	P-type trefoil, chordata	Family
A, B	IPR017957	P-type trefoil, conserved site	Conserved Site
A, B	IPR000519	P-type trefoil domain	Domain

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A, B	PCA	Parent Component: GLN RESID: AA0031 PSI-MOD : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

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.