Annotations: 5X2N

Crystal structure of the medaka fish taste receptor T1r2a-T1r3 ligand binding domains in complex with L-alanine

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d5x2na_	Alpha and beta proteins (a/b)	Periplasmic binding protein-like I	Periplasmic binding protein-like I	automated matches	automated matches	Japanese rice fish (Oryzias latipes ) [TaxId: 8090 ],	SCOPe (2.08)
C	d5x2nc_	Alpha and beta proteins (a/b)	Periplasmic binding protein-like I	Periplasmic binding protein-like I	automated matches	automated matches	Japanese rice fish (Oryzias latipes ) [TaxId: 8090 ],	SCOPe (2.08)
B	d5x2nb_	Alpha and beta proteins (a/b)	Periplasmic binding protein-like I	Periplasmic binding protein-like I	automated matches	automated matches	Japanese rice fish (Oryzias latipes ) [TaxId: 8090 ],	SCOPe (2.08)
D	d5x2nd_	Alpha and beta proteins (a/b)	Periplasmic binding protein-like I	Periplasmic binding protein-like I	automated matches	automated matches	Japanese rice fish (Oryzias latipes ) [TaxId: 8090 ],	SCOPe (2.08)
E [auth H]	d5x2nh_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
G [auth J]	d5x2nj_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
F [auth L]	d5x2nl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
F [auth L]	d5x2nl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
H [auth K]	d5x2nk2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
H [auth K]	d5x2nk1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	Mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Type 1 solute binding protein-like	8078813	3000125	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Type 1 solute binding protein-like	8078813	3000125	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Type 1 solute binding protein-like	8078811	3000125	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Type 1 solute binding protein-like	8078811	3000125	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	Sulfatase,SGSH_C	e5x2nA1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
C	Sulfatase,SGSH_C	e5x2nC1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
B	Sulfatase,SGSH_C	e5x2nB1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
D	Sulfatase,SGSH_C	e5x2nD1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
E [auth H]	Sulfatase,SGSH_C	e5x2nH1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
G [auth J]	Sulfatase,SGSH_C	e5x2nJ1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
F [auth L]	Sulfatase,SGSH_C	e5x2nL1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)
H [auth K]	Sulfatase,SGSH_C	e5x2nK1	A: beta barrels	X: HTH	H: HTH	T: winged helix domain	F: Sulfatase,SGSH_C	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
E [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G [auth J]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
H [auth K]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E [auth H], G [auth J]	Heavy Chain	IGHV1	-	taste receptor, type 1, member 2a \| taste receptor, type 1, member 3	SAbDab (2026-05-08)
F [auth L], H [auth K]	Light Chain	IGKV3	Kappa	taste receptor, type 1, member 2a \| taste receptor, type 1, member 3	SAbDab (2026-05-08)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	Taste receptor, type 1, member 2a	molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity	multicellular organismal process system process sensory perception of chemical stimulus sensory perception nervous system process sensory perception of taste	cell periphery cellular anatomical structure plasma membrane membrane
B, D	Taste receptor, type 1, member 3	molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity	multicellular organismal process system process sensory perception of chemical stimulus sensory perception nervous system process sensory perception of taste	cell periphery cellular anatomical structure plasma membrane membrane
E [auth H], G [auth J]	Fab16A Heavy chain	-	-	-
F [auth L], H [auth K]	Fab16A Light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C	IPR017978	GPCR family 3, C-terminal	Domain
A, C	IPR011500	GPCR, family 3, nine cysteines domain	Domain
A, C	IPR028082	Periplasmic binding protein-like I	Homologous Superfamily
A, C	IPR000337	GPCR, family 3	Family
A, C	IPR000068	GPCR, family 3, extracellular calcium-sensing receptor-related	Family
A, C	IPR038550	GPCR, family 3, nine cysteines domain superfamily	Homologous Superfamily
A, C	IPR001828	Receptor, ligand binding region	Domain
B, D	IPR017978	GPCR family 3, C-terminal	Domain
B, D	IPR011500	GPCR, family 3, nine cysteines domain	Domain
B, D	IPR028082	Periplasmic binding protein-like I	Homologous Superfamily
B, D	IPR000337	GPCR, family 3	Family
B, D	IPR000068	GPCR, family 3, extracellular calcium-sensing receptor-related	Family
B, D	IPR038550	GPCR, family 3, nine cysteines domain superfamily	Homologous Superfamily
B, D	IPR001828	Receptor, ligand binding region	Domain

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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.