Annotations: 3NK3

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Ribosomal_L20	e3nk3B1	A: a/b three-layered sandwiches	X: Tautomerase/MIF-like	H: Tautomerase/MIF	T: Tautomerase/MIF	F: Ribosomal_L20	ECOD (v294.1)
A	TorS_sensor_domain	e3nk3A2	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: Histidine kinase associated sensor domains	T: Histidine kinase associated sensor domains	F: TorS_sensor_domain	ECOD (v294.1)
A	ZP-N	e3nk3A1	A: a/b three-layered sandwiches	X: Single-stranded left-handed beta-helix	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: ZP-N	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.60.40.3210	Mainly Beta	Sandwich	Immunoglobulin-like	Zona pellucida, ZP-N domain	CATH (4.3.0)
B	2.60.40.4100	Mainly Beta	Sandwich	Immunoglobulin-like	Zona pellucida, ZP-C domain	CATH (4.3.0)
A	2.60.40.3210	Mainly Beta	Sandwich	Immunoglobulin-like	Zona pellucida, ZP-N domain	CATH (4.3.0)
A	2.60.40.4100	Mainly Beta	Sandwich	Immunoglobulin-like	Zona pellucida, ZP-C domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF23344	ZP-N domain (ZP-N)	ZP-N domain	This entry represents the N-terminal structural domain of the zona pellucida domain as defined by sequence.	Domain
A, B	PF00100	ZP-C domain (Zona_pellucida)	ZP-C domain	This entry represents the ZP-C domain that is the C-terminal structural domain that composes the zona pellucida domain that was originally defined by sequence.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Zona pellucida 3	protein binding binding acrosin binding enzyme binding identical protein binding structural constituent of egg coat structural molecule activity extracellular matrix structural constituent	regulation of biological process sexual reproduction regulation of reproductive process reproductive process fertilization biological regulation positive regulation of biological process positive regulation of acrosome reaction acrosome reaction regulation of acrosome reaction single fertilization positive regulation of reproductive process response to ketone response to lipid regulation of biological process sexual reproduction regulation of reproductive process reproductive process fertilization biological regulation positive regulation of biological process positive regulation of acrosome reaction acrosome reaction regulation of acrosome reaction single fertilization positive regulation of reproductive process response to ketone response to lipid response to stimulus response to hormone response to steroid hormone response to chemical response to endogenous stimulus response to progesterone response to oxygen-containing compound response to testosterone developmental process egg coat formation cellular developmental process oogenesis multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction female gamete generation gamete generation cell differentiation anatomical structure development germ cell development cellular process sperm-egg recognition cell-cell recognition binding of sperm to zona pellucida cell recognition	cellular anatomical structure apical part of cell extracellular matrix external encapsulating structure extracellular region egg coat specialized extracellular matrix cell periphery plasma membrane membrane
C, D	Zona pellucida 3	protein binding binding acrosin binding enzyme binding identical protein binding structural constituent of egg coat structural molecule activity extracellular matrix structural constituent	regulation of biological process sexual reproduction regulation of reproductive process reproductive process fertilization biological regulation positive regulation of biological process positive regulation of acrosome reaction acrosome reaction regulation of acrosome reaction single fertilization positive regulation of reproductive process response to ketone response to lipid regulation of biological process sexual reproduction regulation of reproductive process reproductive process fertilization biological regulation positive regulation of biological process positive regulation of acrosome reaction acrosome reaction regulation of acrosome reaction single fertilization positive regulation of reproductive process response to ketone response to lipid response to stimulus response to hormone response to steroid hormone response to chemical response to endogenous stimulus response to progesterone response to oxygen-containing compound response to testosterone developmental process egg coat formation cellular developmental process oogenesis multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction female gamete generation gamete generation cell differentiation anatomical structure development germ cell development cellular process sperm-egg recognition cell-cell recognition binding of sperm to zona pellucida cell recognition	cellular anatomical structure apical part of cell extracellular matrix external encapsulating structure extracellular region egg coat specialized extracellular matrix cell periphery plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR017977	Zona pellucida domain, conserved site	Conserved Site
A, B	IPR042235	Zona pellucida, ZP-C domain	Homologous Superfamily
A, B	IPR055356	ZP-N domain	Domain
A, B	IPR055355	ZP-C domain	Domain
A, B	IPR048290	Zona pellucida domain, chordate-type	Domain
A, B	IPR001507	Zona pellucida domain	Domain
C, D	IPR017977	Zona pellucida domain, conserved site	Conserved Site
C, D	IPR042235	Zona pellucida, ZP-C domain	Homologous Superfamily
C, D	IPR055356	ZP-N domain	Domain
C, D	IPR055355	ZP-C domain	Domain
C, D	IPR048290	Zona pellucida domain, chordate-type	Domain
C, D	IPR001507	Zona pellucida 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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.