Annotations: 6CWT

Hepatitis B core-antigen in complex with Fab e21

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C	d6cwtc_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Oryctolagus cuniculus ) [TaxId: 9986 ],	SCOPe (2.08)
A	d6cwta_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Oryctolagus cuniculus ) [TaxId: 9986 ],	SCOPe (2.08)
D	d6cwtd2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Oryctolagus cuniculus ) [TaxId: 9986 ],	SCOPe (2.08)
D	d6cwtd1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Oryctolagus cuniculus ) [TaxId: 9986 ],	SCOPe (2.08)
B	d6cwtb2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Oryctolagus cuniculus ) [TaxId: 9986 ],	SCOPe (2.08)
B	d6cwtb1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Oryctolagus cuniculus ) [TaxId: 9986 ],	SCOPe (2.08)
F	d6cwtf_	All alpha proteins	Hepatitis B viral capsid (hbcag)	Hepatitis B viral capsid (hbcag)	Hepatitis B viral capsid (hbcag)	automated matches	(Hepatitis B virus subtype adyw ) [TaxId: 10419 ],	SCOPe (2.08)
E	d6cwte_	All alpha proteins	Hepatitis B viral capsid (hbcag)	Hepatitis B viral capsid (hbcag)	Hepatitis B viral capsid (hbcag)	automated matches	(Hepatitis B virus subtype adyw ) [TaxId: 10419 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
F	SCOP2B Superfamily	Hepatitis B viral capsid (hbcag)	8086395	3000581	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Hepatitis B viral capsid (hbcag)	8086395	3000581	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)
C	Anoctamin	e6cwtC1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
A	SAD_SRA	e6cwtA1	A: beta barrels	X: Surp module (SWAP domain)	H: ADP-ribosylation	T: ADP-ribosylation	F: SAD_SRA	ECOD (v294.2)
D	Anoctamin	e6cwtD1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
B	SAD_SRA	e6cwtB1	A: beta barrels	X: Surp module (SWAP domain)	H: ADP-ribosylation	T: ADP-ribosylation	F: SAD_SRA	ECOD (v294.2)
F	Anoctamin	e6cwtF1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
E	Anoctamin	e6cwtE1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	1.10.4090.10	Mainly Alpha	Orthogonal Bundle	Hepatitis B viral capsid (hbcag) fold	Viral capsid, core domain supefamily, Hepatitis B virus	CATH (4.3.0)
E	1.10.4090.10	Mainly Alpha	Orthogonal Bundle	Hepatitis B viral capsid (hbcag) fold	Viral capsid, core domain supefamily, Hepatitis B virus	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
A, C	Fab e21	VH-CH1	Chimeric (chimeric)	IGHV1S6901, IGHJ201, IGHJ202, IGHG101, IGHG102, IGHG104, IGHG1*05	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202617-0)
B, D	Fab e21	L-KAPPA	Chimeric (chimeric)	IGKV1S601, IGKJ1-103, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202617-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A, C	Heavy Chain	IGHV1	-	capsid protein	SAbDab (2026-05-08)
B, D	Light Chain	IGKV1	Kappa	capsid protein	SAbDab (2026-05-08)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	Fab e21 heavy chain	-	-	-
B, D	Fab e21 light chain	-	-	-
E, F	Capsid protein	DNA binding binding nucleic acid binding structural molecule activity RNA binding identical protein binding protein binding	biological process involved in interspecies interaction between organisms microtubule-dependent intracellular transport of viral material microtubule-dependent intracellular transport of viral material towards nucleus intracellular transport of virus viral process viral life cycle transport of virus transport of viral material towards nucleus biological process involved in symbiotic interaction viral penetration into host nucleus symbiont entry into host cell symbiont entry into host biological process involved in interaction with host	host cellular component cellular anatomical structure host cell other organism part viral capsid icosahedral viral capsid T=4 icosahedral viral capsid virion component host intracellular part host cell cytoplasm host cell part host intracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E, F	IPR036459	Viral capsid core domain supefamily, Hepatitis B virus	Homologous Superfamily
E, F	IPR002006	Hepatitis core antigen	Family

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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.