Annotations: 7ST8

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth L]	SBP_bac_11	e7st8L1	A: alpha bundles	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: SBP_bac_11	ECOD (develop294)
C [auth S]		e7st8S01	A: alpha bundles	X: Rossmann-like	H: all-alpha NTP pyrophosphatases	T: Hypothetical protein AF_0060	F:	ECOD (develop294)
A [auth H]	SBP_bac_11	e7st8H1	A: alpha bundles	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: SBP_bac_11	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L]	Light Chain	IGKV3	Kappa	astacin-like metalloendopeptidase	SAbDab (2026-03-20)
A [auth H]	Heavy Chain	IGHV8	-	astacin-like metalloendopeptidase	SAbDab (2026-03-20)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth L]	7H2.2 Fab Light Chain	-	-	-
C [auth S]	Astacin-like metalloendopeptidase	peptidase activity catalytic activity, acting on a protein hydrolase activity glutamic-type peptidase activity catalytic activity metalloendopeptidase activity metallopeptidase activity endopeptidase activity aspartic-type peptidase activity cation binding transition metal ion binding zinc ion binding ion binding binding peptidase activity catalytic activity, acting on a protein hydrolase activity glutamic-type peptidase activity catalytic activity metalloendopeptidase activity metallopeptidase activity endopeptidase activity aspartic-type peptidase activity cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding small molecule binding	sexual reproduction reproductive process fertilization cell adhesion cellular process regulation of biological process regulation of cellular process cell-cell recognition regulation of reproductive process binding of sperm to zona pellucida biological regulation negative regulation of biological process regulation of binding of sperm to zona pellucida sperm-egg recognition sexual reproduction reproductive process fertilization cell adhesion cellular process regulation of biological process regulation of cellular process cell-cell recognition regulation of reproductive process binding of sperm to zona pellucida biological regulation negative regulation of biological process regulation of binding of sperm to zona pellucida sperm-egg recognition negative regulation of reproductive process negative regulation of binding of sperm to zona pellucida negative regulation of cellular process cell recognition single fertilization multicellular organismal process egg activation cell activation regulation of fertilization negative regulation of fertilization prevention of polyspermy regulation of protein maturation positive regulation of protein maturation positive regulation of protein metabolic process positive regulation of biological process positive regulation of macromolecule biosynthetic process positive regulation of protein processing protein maturation regulation of primary metabolic process positive regulation of metabolic process regulation of proteolysis positive regulation of biosynthetic process proteolysis positive regulation of macromolecule metabolic process protein metabolic process positive regulation of cellular process regulation of biosynthetic process regulation of protein metabolic process primary metabolic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process positive regulation of gene expression positive regulation of proteolysis regulation of protein processing protein processing metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of metabolic process	membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cellular anatomical structure cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle cortical granule membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cellular anatomical structure cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle cortical granule cell periphery plasma membrane membrane extracellular region extracellular space
A [auth H]	7H2.2 Fab Heavy Chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth S]	IPR006026	Peptidase, metallopeptidase	Domain
C [auth S]	IPR024079	Metallopeptidase, catalytic domain superfamily	Homologous Superfamily
C [auth S]	IPR001506	Peptidase M12A	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.