Annotations: 8VZO

Cryo-EM structure of FLVCR2 in the outward-facing state with choline bound

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth D]	V-set	e8vzoD01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: V-set	ECOD (v294.2)
B	V-set	e8vzoB01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: V-set	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth D]	Light Chain	IGKV1	Kappa	feline leukemia virus subgroup c cellular receptor 2	SAbDab (2026-05-08)
B	Heavy Chain	IGHV3	-	feline leukemia virus subgroup c cellular receptor 2	SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF07690	Major Facilitator Superfamily (MFS_1)	Major Facilitator Superfamily	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth D]	Fab FLV23 light chain	-	-	-
B	Fab FLV23 heavy chain	-	-	-
A	Feline leukemia virus subgroup C cellular receptor 2	choline binding cation binding ion binding binding small molecule binding heme transmembrane transporter activity transporter activity transmembrane transporter activity tetrapyrrole binding heme binding choline transmembrane transporter activity alcohol transmembrane transporter activity amine transmembrane transporter activity ethanolamine transmembrane transporter activity	developmental process multicellular organism development multicellular organismal process head development central nervous system development anatomical structure development animal organ development brain development nervous system development system development localization nitrogen compound transport transport choline transport developmental process multicellular organism development multicellular organismal process head development central nervous system development anatomical structure development animal organ development brain development nervous system development system development localization nitrogen compound transport transport choline transport establishment of localization organic cation transport tube development respiratory tube development lung development respiratory system development primary metabolic process metabolic process cellular process lipid metabolic process blood vessel morphogenesis angiogenesis sprouting angiogenesis vasculature development circulatory system development anatomical structure morphogenesis tube morphogenesis anatomical structure formation involved in morphogenesis blood vessel development embryo development ending in birth or egg hatching chordate embryonic development embryo development in utero embryonic development heme export iron ion transport metal ion transport heme transport transition metal ion transport monoatomic ion transport monoatomic cation transport iron coordination entity transport biosynthetic process macromolecule metabolic process gene expression macromolecule biosynthetic process endothelial cell fate commitment cellular developmental process endothelium development epithelial cell fate commitment endothelial tip cell fate specification epithelial cell differentiation endothelial cell fate specification blood vessel endothelial cell differentiation blood vessel endothelial cell fate commitment cell differentiation epithelium development endothelial cell differentiation cell fate specification tissue development blood vessel endothelial cell fate specification cell fate commitment system process circulatory system process vascular process in circulatory system vascular transport transport across blood-brain barrier cellular component organization organelle organization cellular component organization or biogenesis mitochondrion organization	cellular anatomical structure membrane membrane-bounded organelle mitochondrial membrane intracellular anatomical structure mitochondrion intracellular membrane-bounded organelle intracellular organelle organelle envelope organelle mitochondrial envelope cytoplasm organelle membrane cell periphery cellular anatomical structure membrane membrane-bounded organelle mitochondrial membrane intracellular anatomical structure mitochondrion intracellular membrane-bounded organelle intracellular organelle organelle envelope organelle mitochondrial envelope cytoplasm organelle membrane cell periphery plasma membrane organelle subcompartment endomembrane system endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR011701	Major facilitator superfamily	Family
A	IPR020846	Major facilitator superfamily domain	Domain
A	IPR049680	Choline/ethanolamine transporter FLVCR1-2/SLC49-like	Family
A	IPR036259	MFS transporter superfamily	Homologous Superfamily

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	Solute Carrier (SLC) Transporter Superfamily	FLVCR2 choline transporter (SLC49A2), with bound choline, inward-facing state

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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.