Annotations: 5WB1

Ligand-free US28 with stabilizing intracellular nanobody

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	G protein-coupled receptor-like	8091234	3000473	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)
A		e5wb1A1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F:	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.1070.10	Mainly Alpha	Up-down Bundle	Rhopdopsin 7-helix transmembrane proteins	Rhodopsin 7-helix transmembrane proteins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A	Heavy Chain	IGHV1	-	-	SAbDab (2026-05-08)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Envelope protein US28, nanobody 7 fusion protein	G protein-coupled chemoattractant receptor activity C-C chemokine receptor activity molecular transducer activity chemokine receptor activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity cytokine receptor activity immune receptor activity C-C chemokine binding protein binding binding chemokine binding cytokine binding	positive regulation of cytosolic calcium ion concentration biological regulation regulation of biological quality cell chemotaxis cellular response to stimulus chemotaxis response to stimulus response to external stimulus cellular response to chemical stimulus taxis response to chemical cell migration cellular process cell motility positive regulation of cytosolic calcium ion concentration biological regulation regulation of biological quality cell chemotaxis cellular response to stimulus chemotaxis response to stimulus response to external stimulus cellular response to chemical stimulus taxis response to chemical cell migration cellular process cell motility locomotion regulation of biological process regulation of cellular process signaling intracellular signal transduction cell communication calcium-mediated signaling intracellular signaling cassette signal transduction immune response immune system process	cellular anatomical structure membrane host cell plasma membrane host cellular component host cell part host cell membrane other organism part

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000355	Chemokine receptor family	Family
A	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
A	IPR050119	C-C chemokine receptor type 1-9-like	Family
A	IPR017452	GPCR, rhodopsin-like, 7TM	Domain

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	Rhodopsin-like receptors and pumps	G-protein coupled receptors, family A

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	G Protein-Coupled Receptors: Class A	Human cytomeglovirius US28 GPCR bound to engineered chemokine CX3CL1.3

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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.