Annotations: 8XS3

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	Copine	e8xs3C01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: Copine	ECOD (v294.1)
B	Copine	e8xs3B01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: Copine	ECOD (v294.1)
A	Copine	e8xs3A01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: Copine	ECOD (v294.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Light Chain	IGKV2	Kappa	protein opg190	SAbDab (2026-03-27)
A	Heavy Chain	IGHV1	-	protein opg190	SAbDab (2026-03-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C	PF00084	Sushi repeat (SCR repeat) (Sushi)	Sushi repeat (SCR repeat)		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	Protein OPG190	protein binding binding complement binding	regulation of humoral immune response regulation of immune effector process humoral immune response response to stimulus positive regulation of biological process negative regulation of biological process negative regulation of complement activation positive regulation of response to stimulus complement activation positive regulation of immune response regulation of immune system process positive regulation of immune system process regulation of biological process immune response regulation of humoral immune response regulation of immune effector process humoral immune response response to stimulus positive regulation of biological process negative regulation of biological process negative regulation of complement activation positive regulation of response to stimulus complement activation positive regulation of immune response regulation of immune system process positive regulation of immune system process regulation of biological process immune response negative regulation of response to stimulus negative regulation of immune response biological regulation negative regulation of immune effector process negative regulation of humoral immune response immune effector process regulation of response to stimulus negative regulation of immune system process immune system process regulation of immune response regulation of complement activation activation of immune response	cellular anatomical structure membrane virion component virion membrane host cellular component host intracellular part host cell cytoplasm host cell part host cell Golgi apparatus host intracellular region other organism part host cell cytoplasm part
B	D68_light chain	-	-	-
A	D68_heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR011176	Complement control protein C3/B5	Family
C	IPR051503	Complement System Regulators and Virion Entry Mediators	Family
C	IPR000436	Sushi/SCR/CCP domain	Domain
C	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily

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.