Annotations: 8DAO

Crystal structure of SARS-CoV-2 spike stem fusion peptide in complex with neutralizing antibody COV44-79

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 H]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091527	3000071	SCOP2B (2022-06-29)
D [auth F]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091527	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)
I [auth H]	Peptidase_S29	e8daoH1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
D [auth F]	Peptidase_S29	e8daoF1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
H [auth G]	Peptidase_S29	e8daoG1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
C [auth E]	Peptidase_S29	e8daoE1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
G [auth B]	Peptidase_S29	e8daoB1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
B [auth D]	Peptidase_S29	e8daoD1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
F [auth A]	Peptidase_S29	e8daoA1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)
A [auth C]	Peptidase_S29	e8daoC1	A: alpha arrays	X: putative RnfG subunit of electron transport complex	H: putative RnfG subunit of electron transport complex	T: Aspartate/ornithine carbamoyltransferase	F: Peptidase_S29	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
G [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
F [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A [auth C]	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 D], G [auth B]	Light Chain	IGKV1	Kappa	spike protein s2 fusion peptide	SAbDab (2026-08-21)
A [auth C], F [auth A]	Heavy Chain	IGHV3	-	spike protein s2 fusion peptide	SAbDab (2026-08-21)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
D [auth F], I [auth H]	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
E [auth I], J	Spike protein S2 fusion peptide	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	cellular anatomical structure membrane host cellular component host extracellular region other organism part 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 cellular anatomical structure membrane host cellular component host extracellular region other organism part 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
D [auth F], I [auth H]	COV44-79 light chain constant domain	binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response immune system process B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response immune system process B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process 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 cellular process antigen receptor-mediated signaling pathway activation of immune response	cellular anatomical structure extracellular region blood microparticle extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane IgG immunoglobulin complex cellular anatomical structure extracellular region blood microparticle extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane IgG immunoglobulin complex protein-containing complex immunoglobulin complex
C [auth E], H [auth G]	COV44-79 heavy chain constant domain	-	response to stimulus immune response immune system process adaptive immune response	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex immunoglobulin complex extracellular region
B [auth D], G [auth B]	COV44-79 light chain variable domain	-	-	-
A [auth C], F [auth A]	COV44-79 heavy chain variable domain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

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

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
D [auth F], I [auth H]	: P01834	recurrent infections associated with rare immunoglobulin isotypes deficiency myositis dysgammaglobulinemia Hepatomegaly acquired idiopathic inflammatory myopathy selective IgG immunodeficiency