Annotations: 9IMA

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth D]	FLIC_barrel	e9imaD01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: FLIC_barrel	ECOD (v294.1)
A [auth C]	FLIC_barrel	e9imaC01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: FLIC_barrel	ECOD (v294.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth D]	Light Chain	IGKV1	Kappa	g-protein coupled receptor family c group 5 member d \| g-protein coupled receptor family c group 5 member d	SAbDab (2026-03-27)
A [auth C]	Heavy Chain	IGHV1	-	g-protein coupled receptor family c group 5 member d \| g-protein coupled receptor family c group 5 member d	SAbDab (2026-03-27)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B [auth D]	Talquetamab	GPRC5D, CD3E	Therapeutic SAbDab (2026-03-27)
A [auth C]	Talquetamab	GPRC5D, CD3E	Therapeutic SAbDab (2026-03-27)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth B], D [auth A]	G-protein coupled receptor family C group 5 member D	enzyme regulator activity kinase activator activity enzyme activator activity molecular function activator activity molecular function regulator activity protein kinase activator activity protein kinase regulator activity kinase regulator activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity	-	protein-containing complex receptor complex cell periphery cellular anatomical structure plasma membrane membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle protein-containing complex receptor complex cell periphery cellular anatomical structure plasma membrane membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle
B [auth D]	Talquetamab Fab (anti-GPRC5D) Light chain	-	-	-
A [auth C]	Talquetamab Fab (anti-GPRC5D) Heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth B], D [auth A]	IPR017978	GPCR family 3, C-terminal	Domain
C [auth B], D [auth A]	IPR051753	Retinoic acid-inducible GPCR family 3	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth B], D [auth A]	Pharos: Q9NZD1	bipolar disorder lymphoplasmacytic lymphoma ovarian cancer cutaneous melanoma major affective disorder 2 psoriasis lung cancer Mood Disorders

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
C [auth B], D [auth A]	PDBTM	Annotated as membrane protein by PDBTM

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.