Annotations: 5JK9

Crystal structure of human IZUMO1

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
F	SCOP2B Superfamily	IZUMO1 N-terminal domain-like	8092638	3002613	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8092637	3000071	SCOP2B (2022-06-29)
E	SCOP2 Family	IZUMO1 domain-like	8046008	4004819	SCOP2 (2022-06-29)
E	SCOP2 Family	IZUMO1 N-terminal domain-like	8050777	4007041	SCOP2 (2022-06-29)
E	SCOP2 Superfamily	Immunoglobulin (Ig) domain-like	8092637	3000071	SCOP2 (2022-06-29)
E	SCOP2 Superfamily	IZUMO1 N-terminal domain-like	8092638	3002613	SCOP2 (2022-06-29)
D	SCOP2B Superfamily	IZUMO1 N-terminal domain-like	8092638	3002613	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8092637	3000071	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	IZUMO1 N-terminal domain-like	8092638	3002613	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	IZUMO1 N-terminal domain-like	8092638	3002613	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8092637	3000071	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8092637	3000071	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	IZUMO1 N-terminal domain-like	8092638	3002613	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)
F	HTH_65	e5jk9F1	A: beta barrels	X: P-loop domains-like	H: ARM repeat	T: ARM repeat	F: HTH_65	ECOD (v294.2)
E	HTH_65	e5jk9E1	A: beta barrels	X: P-loop domains-like	H: ARM repeat	T: ARM repeat	F: HTH_65	ECOD (v294.2)
D	HTH_65	e5jk9D1	A: beta barrels	X: P-loop domains-like	H: ARM repeat	T: ARM repeat	F: HTH_65	ECOD (v294.2)
C	HTH_65	e5jk9C1	A: beta barrels	X: P-loop domains-like	H: ARM repeat	T: ARM repeat	F: HTH_65	ECOD (v294.2)
B	HTH_65	e5jk9B1	A: beta barrels	X: P-loop domains-like	H: ARM repeat	T: ARM repeat	F: HTH_65	ECOD (v294.2)
A	HTH_65	e5jk9A1	A: beta barrels	X: P-loop domains-like	H: ARM repeat	T: ARM repeat	F: HTH_65	ECOD (v294.2)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F	PF16706	Izumo-like Immunoglobulin domain (Izumo-Ig)	Izumo-like Immunoglobulin domain	Izumo-Ig is the immunoglobulin domain on Izumo proteins from higher eukaryotes. Izumo is a typical type I membrane glycoprotein with one immunoglobulin-like domain and a putative N-glycoside link motif - glycosylation site. The full-length protein, e ...	Izumo-Ig is the immunoglobulin domain on Izumo proteins from higher eukaryotes. Izumo is a typical type I membrane glycoprotein with one immunoglobulin-like domain and a putative N-glycoside link motif - glycosylation site. The full-length protein, eg Swiss:Q8IYV9, is a molecule with a single immunoglobulin (Ig) domain. It is thought that Izumo proteins bind to putative Izumo receptors on the oocyte. Izumo is not detectable on the surface of fresh sperm but becomes exposed only after an exocytotic process, the acrosome reaction, has occurred. Studies have shown that knock-out mice (Izumo-/- males) were sterile despite normal mating behaviour and ejaculation, indicating the importance of the protein in fertilisation [1]. There is a conserved GCL sequence motif. Izumo expression has been found to be testis-specific [1,2].	Domain
A, B, C, D, E A, B, C, D, E, F	PF15005	Izumo sperm-egg fusion, N-terminal domain (IZUMO)	Izumo sperm-egg fusion, N-terminal domain	This entry represents a domain found upstream of the immunoglobulin domain on IZUMO proteins in higher eukaryotes. The actual function of this region of the Izumo proteins is not known. The full-length protein is a molecule with a single immunoglobul ...	This entry represents a domain found upstream of the immunoglobulin domain on IZUMO proteins in higher eukaryotes. The actual function of this region of the Izumo proteins is not known. The full-length protein is a molecule with a single immunoglobulin (Ig) domain. It is thought that Izumo proteins bind to putative Izumo receptors on the oocyte. Izumo is not detectable on the surface of fresh sperm but becomes exposed only after an exocytotic process, the acrosome reaction, has occurred. Studies have shown that knock-out mice (Izumo-/- males) were sterile despite normal mating behaviour and ejaculation, indicating the importance of the protein in fertilisation [1]. There are cysteine residues thought to form a disulphide bridge. Izumo is a typical type I membrane glycoprotein with one immunoglobulin-like domain and a putative N-glycoside link motif (Asn 204) [2]. There is a conserved GCL sequence motif. Izumo expression has been found to be testis-specific [1,2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F	Izumo sperm-egg fusion protein 1	protein binding binding signaling receptor binding identical protein binding protein homodimerization activity protein dimerization activity molecular function activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity cell adhesion molecule binding cell adhesion mediator activity cell-cell adhesion mediator activity protein binding binding signaling receptor binding identical protein binding protein homodimerization activity protein dimerization activity molecular function activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity cell adhesion molecule binding cell adhesion mediator activity cell-cell adhesion mediator activity protein binding involved in heterotypic cell-cell adhesion	fusion of sperm to egg plasma membrane involved in single fertilization sexual reproduction reproductive process fertilization multicellular organismal reproductive process cellular process involved in reproduction in multicellular organism cellular process single fertilization sperm-egg recognition cell-cell recognition cell recognition cell-cell fusion syncytium formation by cell-cell fusion cell adhesion fusion of sperm to egg plasma membrane involved in single fertilization sexual reproduction reproductive process fertilization multicellular organismal reproductive process cellular process involved in reproduction in multicellular organism cellular process single fertilization sperm-egg recognition cell-cell recognition cell recognition cell-cell fusion syncytium formation by cell-cell fusion cell adhesion binding of sperm to zona pellucida	cellular anatomical structure membrane protein complex involved in cell-cell adhesion protein-containing complex protein complex involved in cell adhesion cell periphery plasma membrane membrane-bounded organelle acrosomal vesicle intracellular anatomical structure intracellular vesicle acrosomal membrane intracellular membrane-bounded organelle endomembrane system cellular anatomical structure membrane protein complex involved in cell-cell adhesion protein-containing complex protein complex involved in cell adhesion cell periphery plasma membrane membrane-bounded organelle acrosomal vesicle intracellular anatomical structure intracellular vesicle acrosomal membrane intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle membrane bounding membrane of organelle vesicle membrane cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle organelle membrane secretory granule membrane organelle subcompartment 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, B, C, D, E A, B, C, D, E, F	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR032699	Izumo protein, immunoglobulin domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR032700	Izumo sperm-egg fusion protein 1	Family
A, B, C, D, E A, B, C, D, E, F	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR029389	Izumo sperm-egg fusion protein	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D, E A, B, C, D, E, F	: Q8IYV9	psoriasis attention deficit hyperactivity disorder, inattentive type colorectal cancer gallbladder disease Behcet disease Crohn disease inflammatory bowel disease cholelithiasis dental caries non-alcoholic fatty liver disease

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.