Annotations: 8PG0

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth L]	HIG_1_N	e8pg0L1	A: alpha bundles	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: HIG_1_N	ECOD (develop294)
B [auth H]	Apc5_N	e8pg0H1	A: alpha bundles	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Apc5_N	ECOD (develop294)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth L]	Light Chain	IGKV1	Kappa	solute carrier organic anion transporter family member 1b3	SAbDab (2026-03-20)
B [auth H]	Heavy Chain	IGHV3	-	solute carrier organic anion transporter family member 1b3	SAbDab (2026-03-20)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF03137	Organic Anion Transporter Polypeptide (OATP) family (OATP)	Organic Anion Transporter Polypeptide (OATP) family	-	Family
A	PF07648	Kazal-type serine protease inhibitor domain (Kazal_2)	Kazal-type serine protease inhibitor domain	Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containi ...	Usually indicative of serine protease inhibitors. However, kazal-like domains are also seen in the extracellular part of agrins, which are not known to be protease inhibitors. Kazal domains often occur in tandem arrays. Small alpha+beta fold containing three disulphides.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth L]	Fab19 (light chain, variable region)	-	-	-
B [auth H]	Fab19 (heavy chain, variable region)	-	-	-
A	Solute carrier organic anion transporter family member 1B3	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity serine-type endopeptidase inhibitor activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity lipid transporter activity lipid transmembrane transporter activity transporter activity monocarboxylic acid transmembrane transporter activity carboxylic acid transmembrane transporter activity enzyme regulator activity molecular function inhibitor activity peptidase regulator activity serine-type endopeptidase inhibitor activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity lipid transporter activity lipid transmembrane transporter activity transporter activity monocarboxylic acid transmembrane transporter activity carboxylic acid transmembrane transporter activity transmembrane transporter activity bile acid transmembrane transporter activity	cellular response to stimulus cellular response to chemical stimulus response to stimulus response to chemical cellular response to xenobiotic stimulus metabolic process cellular process xenobiotic metabolic process response to xenobiotic stimulus pigment catabolic process pigment metabolic process heme metabolic process catabolic process tetrapyrrole metabolic process cellular response to stimulus cellular response to chemical stimulus response to stimulus response to chemical cellular response to xenobiotic stimulus metabolic process cellular process xenobiotic metabolic process response to xenobiotic stimulus pigment catabolic process pigment metabolic process heme metabolic process catabolic process tetrapyrrole metabolic process heme catabolic process porphyrin-containing compound catabolic process porphyrin-containing compound metabolic process tetrapyrrole catabolic process localization transport monoatomic ion transport establishment of localization organic anion transport sodium-independent organic anion transport carboxylic acid transport lipid localization bile acid and bile salt transport lipid transport organic hydroxy compound transport organic acid transport monocarboxylic acid transport macromolecule localization	cell periphery cellular anatomical structure basal part of cell membrane plasma membrane basal plasma membrane plasma membrane region basolateral plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR036058	Kazal domain superfamily	Homologous Superfamily
A	IPR004156	Organic anion transporter polypeptide	Family
A	IPR036259	MFS transporter superfamily	Homologous Superfamily
A	IPR002350	Kazal domain	Domain
A	IPR020846	Major facilitator superfamily domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: Q9NPD5	Rotor syndrome malignant colon neoplasm rheumatoid arthritis ulcerative colitis benign colon neoplasm Crohn disease erectile dysfunction Lung Neoplasms malignant pancreatic neoplasm pancreatic ductal adenocarcinoma colonic neoplasm cystic fibrosis lung benign neoplasm mucocutaneous lymph node syndrome pulmonary arterial hypertension Rotor syndrome malignant colon neoplasm rheumatoid arthritis ulcerative colitis benign colon neoplasm Crohn disease erectile dysfunction Lung Neoplasms malignant pancreatic neoplasm pancreatic ductal adenocarcinoma colonic neoplasm cystic fibrosis lung benign neoplasm mucocutaneous lymph node syndrome pulmonary arterial hypertension colorectal cancer dry eye syndrome lung cancer non-small cell lung carcinoma

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	OATP1B3 organic anion transporting polypeptide (SLC21A8)

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.