Annotations: 8CWJ

Fab arms of antibodies 4C12-B12 and CR3022 bound to pangolin receptor binding domain (pRBD)

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
I [auth U]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
G [auth J]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
F [auth I]	SCOP2B Superfamily	SARS coronavirus receptor-binding domain-like	8092467	3001706	SCOP2B (2022-06-29)
C [auth G]	SCOP2B Superfamily	SARS coronavirus receptor-binding domain-like	8092467	3001706	SCOP2B (2022-06-29)
D [auth A]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	SCOP2B (2022-06-29)
A [auth H]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091519	3000071	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)
J [auth V]	Peptidase_C1	e8cwjV1	A: alpha arrays	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Peptidase_C1	ECOD (v295.2)
H [auth K]	Ald_Xan_dh_C	e8cwjK1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ald_Xan_dh_C	ECOD (v295.2)
I [auth U]	Peptidase_C1	e8cwjU1	A: alpha arrays	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Peptidase_C1	ECOD (v295.2)
G [auth J]	Ald_Xan_dh_C	e8cwjJ1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ald_Xan_dh_C	ECOD (v295.2)
F [auth I]	Peptidase_C1	e8cwjI1	A: alpha arrays	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Peptidase_C1	ECOD (v295.2)
C [auth G]	Peptidase_C1	e8cwjG1	A: alpha arrays	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Peptidase_C1	ECOD (v295.2)
E [auth B]	Peptidase_C1	e8cwjB1	A: alpha arrays	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Peptidase_C1	ECOD (v295.2)
B [auth L]	Ald_Xan_dh_C	e8cwjL1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ald_Xan_dh_C	ECOD (v295.2)
D [auth A]	Ald_Xan_dh_C	e8cwjA1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Ald_Xan_dh_C	ECOD (v295.2)
A [auth H]	Peptidase_C1	e8cwjH1	A: alpha arrays	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Peptidase_C1	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
J [auth V]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
H [auth K]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
I [auth U]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
G [auth J]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D [auth A]	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
H [auth K], J [auth V]	Light Chain	IGKV1	Kappa	spike glycoprotein	SAbDab (2026-09-25)
G [auth J], I [auth U]	Heavy Chain	IGHV3	-	spike glycoprotein	SAbDab (2026-09-25)
B [auth L], E [auth B]	Light Chain	IGKV4	Kappa	spike glycoprotein	SAbDab (2026-09-25)
A [auth H], D [auth A]	Heavy Chain	IGHV5	-	spike glycoprotein	SAbDab (2026-09-25)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
G [auth J], I [auth U]	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain
C [auth G], F [auth I]	PF09408	Betacoronavirus spike glycoprotein S1, receptor binding (bCoV_S1_RBD)	Betacoronavirus spike glycoprotein S1, receptor binding	This entry represents the receptor binding domain (S1 RBD) of the betacoronavirus spike glycoprotein. The spike glycoprotein is arranged in trimers on the surface of the viral membrane and is essential for viral entry. The spike protein is translat ...	This entry represents the receptor binding domain (S1 RBD) of the betacoronavirus spike glycoprotein. The spike glycoprotein is arranged in trimers on the surface of the viral membrane and is essential for viral entry. The spike protein is translated as a large polypeptide that is subsequently cleaved to the distal S1, responsible for receptor binding, and the membrane-anchored S2 responsible for membrane fusion [1]. The coronavirus (SARS-CoV) S1 subunit is composed of two distinct domains: an N-terminal domain (S1 NTD) and a receptor-binding domain (S1 RBD) also referred to as the S1 CTD or domain B. Each of these domains have been implicated in binding to host receptors. However, most coronaviruses are not known to utilise both the S1 NTD and S1 RBD for viral entry [2]. SARS-CoV makes use of its S1 RBD to bind to the human angiotensin-converting enzyme 2 (ACE2) as its host receptor [3,4].	Domain
A [auth H], D [auth A]	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
H [auth K], J [auth V]	Light chain of 4C12-B12 antibody Fab	-	-	cell periphery cellular anatomical structure plasma membrane membrane extracellular region
G [auth J], I [auth U]	Heavy chain of 4C12-B12 antibody Fab	protein-containing complex binding protein binding binding signaling receptor binding immunoglobulin receptor binding Fc-gamma receptor I complex binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress leukocyte mediated immunity antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response immune response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress leukocyte mediated immunity antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response immune response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus immunoglobulin mediated immune response adaptive immune response immune effector process type II hypersensitivity immune system process type IIa hypersensitivity B cell mediated immunity cellular process inflammatory response cell killing cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process regulation of biological process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway B cell receptor signaling pathway biological regulation regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response humoral immune response complement activation humoral immune response mediated by circulating immunoglobulin complement activation, classical pathway complement-dependent cytotoxicity biological process involved in interspecies interaction between organisms response to other organism antibacterial humoral response defense response to symbiont response to external stimulus antimicrobial humoral response response to biotic stimulus defense response to bacterium defense response to other organism response to bacterium response to external biotic stimulus	cellular anatomical structure extracellular region blood microparticle protein-containing complex extracellular protein-containing complex immunoglobulin complex, circulating immunoglobulin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cellular anatomical structure extracellular region blood microparticle protein-containing complex extracellular protein-containing complex immunoglobulin complex, circulating immunoglobulin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane IgG immunoglobulin complex
C [auth G], F [auth I]	Spike glycoprotein	molecular function activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity host cell surface binding binding host cell surface receptor binding structural constituent of virion structural molecule activity identical protein binding protein binding	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion cellular process cellular component organization or biogenesis symbiont-mediated disruption of host anatomical structure biological process involved in interspecies interaction between organisms symbiont-mediated disruption of host tissue disruption of anatomical structure in another organism symbiont entry into host cell symbiont entry into host viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion cellular process cellular component organization or biogenesis symbiont-mediated disruption of host anatomical structure biological process involved in interspecies interaction between organisms symbiont-mediated disruption of host tissue disruption of anatomical structure in another organism symbiont entry into host cell symbiont entry into host viral life cycle biological process involved in interaction with host biological process involved in symbiotic interaction virion attachment to host cell receptor-mediated virion attachment to host cell adhesion of symbiont to host cell adhesion of symbiont to host fusion of virus membrane with host plasma membrane endocytosis involved in viral entry into host cell symbiont-mediated perturbation of host defense response symbiont-mediated perturbation of host process symbiont-mediated-mediated suppression of host tetherin activity modulation of process of another organism regulation of biological process positive regulation of viral life cycle positive regulation of viral process biological regulation positive regulation of biological process modulation by symbiont of entry into host regulation of viral entry into host cell regulation of viral life cycle regulation of viral process positive regulation of viral entry into host cell positive regulation by symbiont of entry into host regulation of biological process involved in symbiotic interaction symbiont-mediated suppression of host immune response symbiont-mediated suppression of host innate immune response symbiont-mediated perturbation of host immune response symbiont-mediated perturbation of host innate immune response entry receptor-mediated virion attachment to host cell	host cellular component host extracellular region cellular anatomical structure other organism part membrane cell periphery plasma membrane host intracellular membrane-bounded organelle host intracellular part host cell membrane host cell cytoplasm part host intracellular organelle host cell endoplasmic reticulum-Golgi intermediate compartment membrane host cell endoplasmic reticulum-Golgi intermediate compartment host cellular component host extracellular region cellular anatomical structure other organism part membrane cell periphery plasma membrane host intracellular membrane-bounded organelle host intracellular part host cell membrane host cell cytoplasm part host intracellular organelle host cell endoplasmic reticulum-Golgi intermediate compartment membrane host cell endoplasmic reticulum-Golgi intermediate compartment host cell cytoplasm host cell part host intracellular region host cell plasma membrane virion component virion membrane viral membrane viral envelope host cell surface
B [auth L], E [auth B]	Light chain of CR3022 antibody Fab	-	-	cellular anatomical structure extracellular region
A [auth H], D [auth A]	Heavy chain of CR3022 antibody Fab	protein-containing complex binding protein binding binding signaling receptor binding immunoglobulin receptor binding Fc-gamma receptor I complex binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress leukocyte mediated immunity antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response immune response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress leukocyte mediated immunity antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response immune response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus immunoglobulin mediated immune response adaptive immune response immune effector process type II hypersensitivity immune system process type IIa hypersensitivity B cell mediated immunity cellular process inflammatory response cell killing cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process regulation of biological process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway B cell receptor signaling pathway biological regulation regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response humoral immune response complement activation humoral immune response mediated by circulating immunoglobulin complement activation, classical pathway complement-dependent cytotoxicity biological process involved in interspecies interaction between organisms response to other organism antibacterial humoral response defense response to symbiont response to external stimulus antimicrobial humoral response response to biotic stimulus defense response to bacterium defense response to other organism response to bacterium response to external biotic stimulus	cellular anatomical structure extracellular region blood microparticle protein-containing complex extracellular protein-containing complex immunoglobulin complex, circulating immunoglobulin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cellular anatomical structure extracellular region blood microparticle protein-containing complex extracellular protein-containing complex immunoglobulin complex, circulating immunoglobulin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane IgG immunoglobulin complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
H [auth K], J [auth V]	IPR003597	Immunoglobulin C1-set	Domain
H [auth K], J [auth V]	IPR050150	Immunoglobulin Variable Light Chain	Family
H [auth K], J [auth V]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
H [auth K], J [auth V]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
H [auth K], J [auth V]	IPR013106	Immunoglobulin V-set domain	Domain
H [auth K], J [auth V]	IPR003599	Immunoglobulin domain subtype	Domain
H [auth K], J [auth V]	IPR007110	Immunoglobulin-like domain	Domain
H [auth K], J [auth V]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
G [auth J], I [auth U]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
G [auth J], I [auth U]	IPR050380	Immune Recognition and Response Modulators	Family
G [auth J], I [auth U]	IPR003597	Immunoglobulin C1-set	Domain
G [auth J], I [auth U]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
G [auth J], I [auth U]	IPR007110	Immunoglobulin-like domain	Domain
G [auth J], I [auth U]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
C [auth G], F [auth I]	IPR044873	Spike glycoprotein S2, coronavirus, heptad repeat 1	Domain
C [auth G], F [auth I]	IPR044366	Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2	Domain
C [auth G], F [auth I]	IPR018548	Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus	Domain
C [auth G], F [auth I]	IPR044341	Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like	Domain
C [auth G], F [auth I]	IPR032500	Spike glycoprotein S1, N-terminal domain, betacoronavirus-like	Domain
C [auth G], F [auth I]	IPR042578	Spike glycoprotein, betacoronavirus	Family
C [auth G], F [auth I]	IPR036326	Spike S1 subunit, receptor binding domain superfamily, betacoronavirus	Homologous Superfamily
C [auth G], F [auth I]	IPR043002	Spike glycoprotein, N-terminal domain superfamily	Homologous Superfamily
C [auth G], F [auth I]	IPR044874	Spike glycoprotein S2, coronavirus, heptad repeat 2	Domain
C [auth G], F [auth I]	IPR043473	Spike glycoprotein S2 superfamily, coronavirus	Homologous Superfamily
C [auth G], F [auth I]	IPR043607	Coronavirus spike glycoprotein S1, C-terminal	Domain
C [auth G], F [auth I]	IPR002552	Spike glycoprotein S2, coronavirus	Domain
B [auth L], E [auth B]	IPR003597	Immunoglobulin C1-set	Domain
B [auth L], E [auth B]	IPR050150	Immunoglobulin Variable Light Chain	Family
B [auth L], E [auth B]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B [auth L], E [auth B]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B [auth L], E [auth B]	IPR013106	Immunoglobulin V-set domain	Domain
B [auth L], E [auth B]	IPR003599	Immunoglobulin domain subtype	Domain
B [auth L], E [auth B]	IPR007110	Immunoglobulin-like domain	Domain
A [auth H], D [auth A]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A [auth H], D [auth A]	IPR050380	Immune Recognition and Response Modulators	Family
A [auth H], D [auth A]	IPR003597	Immunoglobulin C1-set	Domain
A [auth H], D [auth A]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A [auth H], D [auth A]	IPR007110	Immunoglobulin-like domain	Domain
A [auth H], D [auth A]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
G [auth J], I [auth U]	: P01857	B-cell chronic lymphocytic leukemia myositis polycystic ovary syndrome plasma cell myeloma plasma cell neoplasm Sclerocystic Ovaries acquired idiopathic inflammatory myopathy lung adenocarcinoma ovarian cancer peripheral neuropathy Sjogren syndrome amyloidosis breast cancer medulloblastoma nasopharyngeal carcinoma B-cell chronic lymphocytic leukemia myositis polycystic ovary syndrome plasma cell myeloma plasma cell neoplasm Sclerocystic Ovaries acquired idiopathic inflammatory myopathy lung adenocarcinoma ovarian cancer peripheral neuropathy Sjogren syndrome amyloidosis breast cancer medulloblastoma nasopharyngeal carcinoma periodontitis interstitial cystitis myeloid neoplasm osteosarcoma peripheral nervous system disease
A [auth H], D [auth A]	: P01857	B-cell chronic lymphocytic leukemia myositis polycystic ovary syndrome plasma cell myeloma plasma cell neoplasm Sclerocystic Ovaries acquired idiopathic inflammatory myopathy lung adenocarcinoma ovarian cancer peripheral neuropathy Sjogren syndrome amyloidosis breast cancer medulloblastoma nasopharyngeal carcinoma B-cell chronic lymphocytic leukemia myositis polycystic ovary syndrome plasma cell myeloma plasma cell neoplasm Sclerocystic Ovaries acquired idiopathic inflammatory myopathy lung adenocarcinoma ovarian cancer peripheral neuropathy Sjogren syndrome amyloidosis breast cancer medulloblastoma nasopharyngeal carcinoma periodontitis interstitial cystitis myeloid neoplasm osteosarcoma peripheral nervous system disease