9AU1 | pdb_00009au1

SARS-CoV-2 XBB.1.5 RBD bound to the VIR-7229 and the S309 Fab fragments

External Resource: Annotation

SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Protein Modification Annotation

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth M]	Heavy Chain	IGHV1	-	sars-cov-2 xbb.1.5 rbd	SAbDab (2025-04-18)
B [auth N]	Light Chain	IGKV3	Kappa	sars-cov-2 xbb.1.5 rbd	SAbDab (2025-04-18)
C [auth H]	Heavy Chain	IGHV3	-	sars-cov-2 xbb.1.5 rbd	SAbDab (2025-04-18)
D [auth L]	Light Chain	IGLV2	Lambda	sars-cov-2 xbb.1.5 rbd	SAbDab (2025-04-18)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
A [auth M]	Beludavimab	SARS-CoV-2 Spike RBD	Therapeutic SAbDab (2025-04-18)
B [auth N]	Beludavimab	SARS-CoV-2 Spike RBD	Therapeutic SAbDab (2025-04-18)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
E [auth R]	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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth M]	S309 Fab heavy chain	-	-	-
B [auth N]	S309 Fab light chain	-	-	-
C [auth H]	VIR-7229 Fab heavy chain	-	-	-
D [auth L]	VIR-7229 Fab light chain	-	-	-
E [auth R]	SARS-CoV-2 XBB.1.5 RBD	-	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell virion attachment to host cell biological process involved in interspecies interaction between organisms receptor-mediated virion attachment to host cell adhesion of symbiont to host cell viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction membrane organization cellular component organization membrane fusion viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell virion attachment to host cell biological process involved in interspecies interaction between organisms receptor-mediated virion attachment to host cell adhesion of symbiont to host cell viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis symbiont entry into host cell symbiont entry into host endocytosis involved in viral entry into host cell	cellular anatomical structure membrane virion component virion membrane host intracellular membrane-bounded organelle host cellular component 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 cellular anatomical structure membrane virion component virion membrane host intracellular membrane-bounded organelle host cellular component 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 viral membrane viral envelope host cell plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E [auth R]	IPR018548	Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus	Domain
E [auth R]	IPR044341	Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like	Domain
E [auth R]	IPR032500	Spike glycoprotein S1, N-terminal domain, betacoronavirus-like	Domain
E [auth R]	IPR042578	Spike glycoprotein, betacoronavirus	Family
E [auth R]	IPR036326	Spike S1 subunit, receptor binding domain superfamily, betacoronavirus	Homologous Superfamily
E [auth R]	IPR043002	Spike glycoprotein, N-terminal domain superfamily	Homologous Superfamily
E [auth R]	IPR044874	Spike glycoprotein S2, coronavirus, heptad repeat 2	Domain
E [auth R]	IPR044873	Spike glycoprotein S2, coronavirus, heptad repeat 1	Domain
E [auth R]	IPR043473	Spike glycoprotein S2 superfamily, coronavirus	Homologous Superfamily
E [auth R]	IPR043607	Coronavirus spike glycoprotein S1, C-terminal	Domain
E [auth R]	IPR002552	Spike glycoprotein S2, coronavirus	Domain
E [auth R]	IPR044366	Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2	Domain

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
D [auth L]	PCA	Parent Component: GLN RESID: AA0031 PSI-MOD : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

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.