Annotations: 8EK1

Cryo-EM structure of a potent anti-malarial antibody L9 in complex with Plasmodium falciparum circumsporozoite protein (PfCSP)(dominant class)

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F [auth L]	Ion_trans	e8ek1L1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
D	Ion_trans	e8ek1D1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
B	Ion_trans	e8ek1B1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
E [auth H]	Ion_trans	e8ek1H1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
C	Ion_trans	e8ek1C1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)
A	Ion_trans	e8ek1A1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ion_trans	ECOD (v295)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	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, D, F [auth L]	Light Chain	IGKV1	Kappa	circumsporozoite protein	SAbDab (2026-06-26)
A, C, E [auth H]	Heavy Chain	IGHV3	-	circumsporozoite protein	SAbDab (2026-06-26)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
G [auth P]	Circumsporozoite protein	host cell surface binding binding protein binding heparan sulfate proteoglycan binding proteoglycan binding carbohydrate derivative binding	biological process involved in interspecies interaction between organisms symbiont entry into host biological process involved in interaction with host biological process involved in symbiotic interaction symbiont entry into host cell viral process viral life cycle entry into host cell by a symbiont-containing vacuole	cell surface cellular anatomical structure membrane side of membrane cell periphery plasma membrane intracellular anatomical structure cytoplasm
B, D, F [auth L]	L9 Fab light chain	-	-	-
A, C, E [auth H]	L9 Fab heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
G [auth P]	IPR000884	Thrombospondin type-1 (TSP1) repeat	Repeat
G [auth P]	IPR003067	Plasmodium circumsporozoite protein	Family
G [auth P]	IPR051860	Plasmodium Circumsporozoite Invasion Protein	Family
G [auth P]	IPR036383	Thrombospondin type-1 repeat superfamily	Homologous Superfamily

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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.