8HIJ | pdb_00008hij

The 5-MTHF-bound BRIL-SLC19A1/Fab/Nb ternary complex

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Cytochromes	8057879	3001526	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)
D [auth L]	V-set	e8hijL1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: V-set	ECOD (v294.1)
C [auth N]	V-set	e8hijN1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: V-set	ECOD (v294.1)
B [auth H]	V-set	e8hijH1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: V-set	ECOD (v294.1)
A	V-set	e8hijA1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: V-set	ECOD (v294.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D [auth L]	Light Chain	IGKV1	Kappa	bril-slc19a1 chimera	SAbDab (2026-03-27)
C [auth N]	Heavy Chain	IGHV1	-	-	SAbDab (2026-03-27)
B [auth H]	Heavy Chain	IGHV3	-	bril-slc19a1 chimera	SAbDab (2026-03-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01770	Reduced folate carrier (Folate_carrier)	Reduced folate carrier	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth L]	Anti-BRIL Fab light chain	-	-	-
C [auth N]	Anti-Fab nanobody	-	-	-
B [auth H]	Anti-BRIL Fab heavy chain	-	-	-
A	BRIL-SLC19A1 chimera	binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding monoatomic anion transmembrane transporter activity folic acid transmembrane transporter activity vitamin transmembrane transporter activity carboxylic acid transmembrane transporter activity binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding monoatomic anion transmembrane transporter activity folic acid transmembrane transporter activity vitamin transmembrane transporter activity carboxylic acid transmembrane transporter activity modified amino acid transmembrane transporter activity secondary active transmembrane transporter activity folate:monoatomic anion antiporter activity antiporter activity active transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity xenobiotic transmembrane transporter activity dicarboxylic acid transmembrane transporter activity methotrexate transmembrane transporter activity nucleotide transmembrane transporter activity guanine nucleotide transmembrane transporter activity purine ribonucleotide transmembrane transporter activity adenine nucleotide transmembrane transporter activity purine nucleotide transmembrane transporter activity carbohydrate derivative transmembrane transporter activity nucleobase-containing compound transmembrane transporter activity cyclic-GMP-AMP transmembrane transporter activity organophosphate ester transmembrane transporter activity cyclic GMP-AMP binding guanyl nucleotide binding adenyl ribonucleotide binding cyclic nucleotide binding nucleotide binding guanyl ribonucleotide binding purine ribonucleotide binding nucleoside phosphate binding purine nucleotide binding anion binding adenyl nucleotide binding 2',3'-cyclic GMP-AMP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding vitamin binding organic acid binding modified amino acid binding folic acid binding carboxylic acid binding	electron transport chain metabolic process cellular process generation of precursor metabolites and energy cellular response to stimulus positive regulation of cell communication positive regulation of response to biotic stimulus regulation of cellular process positive regulation of signal transduction pattern recognition receptor signaling pathway response to stimulus regulation of signal transduction response to biotic stimulus intracellular signal transduction electron transport chain metabolic process cellular process generation of precursor metabolites and energy cellular response to stimulus positive regulation of cell communication positive regulation of response to biotic stimulus regulation of cellular process positive regulation of signal transduction pattern recognition receptor signaling pathway response to stimulus regulation of signal transduction response to biotic stimulus intracellular signal transduction cGAS/STING signaling pathway cell communication immune response-activating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process innate immune response-activating signaling pathway regulation of biological process positive regulation of pattern recognition receptor signaling pathway immune response response to other organism regulation of innate immune response response to external stimulus positive regulation of intracellular signal transduction positive regulation of cGAS/STING signaling pathway regulation of response to stimulus defense response to other organism regulation of pattern recognition receptor signaling pathway positive regulation of defense response activation of innate immune response regulation of immune response activation of immune response cytoplasmic pattern recognition receptor signaling pathway regulation of defense response regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms regulation of response to external stimulus intracellular receptor signaling pathway signaling positive regulation of biological process regulation of cytoplasmic pattern recognition receptor signaling pathway positive regulation of response to stimulus positive regulation of response to external stimulus immune response-regulating signaling pathway regulation of intracellular signal transduction regulation of response to stress response to stress innate immune response response to external biotic stimulus positive regulation of cellular process regulation of signaling positive regulation of innate immune response defense response biological regulation defense response to symbiont immune system process regulation of cell communication positive regulation of signaling response to chemical response to xenobiotic stimulus import into cell organic anion transport nitrogen compound transport carboxylic acid transport carboxylic acid transmembrane transport transport import across plasma membrane vitamin transport folate transmembrane transport establishment of localization transmembrane transport organic acid transport localization folate import across plasma membrane folic acid transport dicarboxylic acid transport modified amino acid transport vitamin transmembrane transport multi-multicellular organism process multicellular organismal process reproductive process female pregnancy multi-organism reproductive process xenobiotic transmembrane transport xenobiotic transport response to toxic substance oxoacid metabolic process dicarboxylic acid metabolic process carboxylic acid metabolic process modified amino acid metabolic process organic acid metabolic process folic acid-containing compound metabolic process small molecule metabolic process pteridine-containing compound metabolic process folic acid metabolic process guanine nucleotide transmembrane transport nucleotide transport purine ribonucleotide transport carbohydrate derivative transport purine nucleotide transport adenine nucleotide transport nucleotide transmembrane transport cyclic-GMP-AMP transmembrane import across plasma membrane guanine nucleotide transport cyclic nucleotide transport nucleobase-containing compound transport organophosphate ester transport purine-containing compound transmembrane transport system process circulatory system process vascular process in circulatory system vascular transport transport across blood-brain barrier methotrexate transport	cellular anatomical structure extracellular region periplasmic space cell periphery apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane basal part of cell basal plasma membrane basolateral plasma membrane brush border membrane cluster of actin-based cell projections cellular anatomical structure extracellular region periplasmic space cell periphery apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane basal part of cell basal plasma membrane basolateral plasma membrane brush border membrane cluster of actin-based cell projections plasma membrane bounded cell projection brush border cell projection cell projection membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR010980	Cytochrome c/b562	Homologous Superfamily
A	IPR009155	Cytochrome b562	Family
A	IPR002666	Reduced folate carrier	Family
A	IPR028339	Reduced folate transporter SLC19A1	Family
A	IPR036259	MFS transporter superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P41440	cleft palate Down syndrome malignant colon neoplasm urinary bladder cancer nervous system disorder follicular thyroid adenoma adenoma microcystic adenoma papillary adenoma colorectal cancer Crohn disease Down Syndrome, Partial Trisomy 21 familial hemolytic anemia malignant glioma mature T-cell and NK-cell non-Hodgkin lymphoma cleft palate Down syndrome malignant colon neoplasm urinary bladder cancer nervous system disorder follicular thyroid adenoma adenoma microcystic adenoma papillary adenoma colorectal cancer Crohn disease Down Syndrome, Partial Trisomy 21 familial hemolytic anemia malignant glioma mature T-cell and NK-cell non-Hodgkin lymphoma autism ovarian cancer breast cancer tuberculosis colorectal carcinoma urinary bladder neoplasm lung adenocarcinoma malignant mesothelioma medulloblastoma non-small cell lung carcinoma pancreatic intraductal papillary-mucinous neoplasm childhood acute lymphoblastic leukemia colonic neoplasm ulcerative colitis large cell medulloblastoma malignant pleural mesothelioma osteosarcoma benign colon neoplasm cleft lip psoriasis

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	Major Facilitator Superfamily (MFS)	Reduced folate carrier

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

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.

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