7UM3 | pdb_00007um3

Crystal structure of a Fab in complex with a peptide derived from the LAG-3 D1 domain loop insertion

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth L]	prok_STING	e7um3L1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (v294.1)
B [auth M]	prok_STING	e7um3M1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (v294.1)
C [auth H]	prok_STING	e7um3H1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (v294.1)
A [auth I]	prok_STING	e7um3I1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B [auth M]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A [auth I]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth M], D [auth L]	Light Chain	IGKV3	Kappa	d1 domain loop peptide from lymphocyte activation gene 3protein	SAbDab (2026-04-17)
A [auth I], C [auth H]	Heavy Chain	IGHV4	-	d1 domain loop peptide from lymphocyte activation gene 3protein	SAbDab (2026-04-17)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B [auth M], D [auth L]	Cugrastomig	LAG3/CD223, PDCD1/CD279/PD1	Therapeutic SAbDab (2026-04-17)
A [auth I], C [auth H]	Cugrastomig	LAG3/CD223, PDCD1/CD279/PD1	Therapeutic SAbDab (2026-04-17)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth B], F [auth A]	D1 domain loop peptide from Lymphocyte activation gene 3 protein	protein binding binding signaling receptor binding MHC class II protein binding MHC protein binding antigen binding molecular transducer activity transmembrane signaling receptor activity signaling receptor activity	regulation of immune effector process lymphocyte mediated immunity positive regulation of leukocyte mediated immunity positive regulation of response to biotic stimulus regulation of cellular process response to stimulus response to biotic stimulus positive regulation of leukocyte mediated cytotoxicity positive regulation of immune response positive regulation of natural killer cell mediated immunity leukocyte mediated immunity regulation of immune system process natural killer cell mediated immunity positive regulation of immune system process regulation of immune effector process lymphocyte mediated immunity positive regulation of leukocyte mediated immunity positive regulation of response to biotic stimulus regulation of cellular process response to stimulus response to biotic stimulus positive regulation of leukocyte mediated cytotoxicity positive regulation of immune response positive regulation of natural killer cell mediated immunity leukocyte mediated immunity regulation of immune system process natural killer cell mediated immunity positive regulation of immune system process regulation of biological process regulation of natural killer cell mediated immunity immune response response to other organism regulation of innate immune response response to external stimulus leukocyte mediated cytotoxicity immune effector process regulation of leukocyte mediated immunity regulation of response to stimulus defense response to other organism positive regulation of defense response natural killer cell mediated cytotoxicity regulation of immune response positive regulation of natural killer cell mediated cytotoxicity regulation of cell killing positive regulation of cell killing regulation of defense response regulation of response to biotic stimulus regulation of natural killer cell mediated cytotoxicity biological process involved in interspecies interaction between organisms regulation of response to external stimulus positive regulation of lymphocyte mediated immunity positive regulation of biological process positive regulation of response to stimulus positive regulation of response to external stimulus regulation of response to stress response to stress innate immune response positive regulation of immune effector process response to external biotic stimulus positive regulation of cellular process positive regulation of innate immune response defense response regulation of leukocyte mediated cytotoxicity biological regulation defense response to symbiont regulation of lymphocyte mediated immunity immune system process cellular process cell killing adaptive immune response multicellular organismal process negative regulation of biological process negative regulation of interleukin-2 production regulation of cytokine production cytokine production negative regulation of cellular process regulation of multicellular organismal process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of interleukin-2 production negative regulation of metabolic process interleukin-2 production negative regulation of cytokine production regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process negative regulation of multicellular organismal process regulation of metabolic process cell activation plasmacytoid dendritic cell activation leukocyte activation T cell activation lymphocyte activation cellular response to stimulus cell surface receptor signaling pathway signaling signal transduction cell communication immune response-regulating cell surface receptor signaling pathway negative regulation of signaling regulation of signal transduction regulation of antigen receptor-mediated signaling pathway negative regulation of antigen receptor-mediated signaling pathway negative regulation of cell communication immune response-activating signaling pathway immune response-regulating signaling pathway regulation of signaling immune response-activating cell surface receptor signaling pathway negative regulation of response to stimulus regulation of T cell receptor signaling pathway T cell receptor signaling pathway negative regulation of signal transduction negative regulation of T cell receptor signaling pathway negative regulation of immune system process regulation of cell communication antigen receptor-mediated signaling pathway activation of immune response adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains T cell mediated immunity negative regulation of response to biotic stimulus immune response to tumor cell negative regulation of immune response to tumor cell negative regulation of response to tumor cell negative regulation of lymphocyte mediated immunity regulation of response to tumor cell T cell mediated immune response to tumor cell negative regulation of T cell mediated immune response to tumor cell regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of T cell mediated immune response to tumor cell regulation of T cell mediated immunity response to tumor cell regulation of adaptive immune response negative regulation of immune response negative regulation of immune effector process regulation of immune response to tumor cell negative regulation of adaptive immune response negative regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains negative regulation of leukocyte mediated immunity negative regulation of T cell mediated immunity regulation of leukocyte activation regulation of cell activation negative regulation of lymphocyte activation leukocyte cell-cell adhesion negative regulation of cell adhesion cell adhesion cell-cell adhesion regulation of cell-cell adhesion regulation of cell adhesion regulation of T cell activation negative regulation of cell activation negative regulation of T cell activation negative regulation of leukocyte cell-cell adhesion negative regulation of cell-cell adhesion regulation of leukocyte cell-cell adhesion negative regulation of leukocyte activation regulation of lymphocyte activation regulation of leukocyte differentiation mononuclear cell differentiation regulation of cell differentiation lymphocyte differentiation regulation of cell development multicellular organism development negative regulation of T cell differentiation cell differentiation anatomical structure development T cell differentiation negative regulation of hemopoiesis developmental process negative regulation of leukocyte differentiation negative regulation of lymphocyte differentiation leukocyte differentiation cellular developmental process regulation of developmental process cell development regulation of T cell differentiation negative regulation of regulatory T cell differentiation negative regulation of cell differentiation regulation of lymphocyte differentiation regulation of multicellular organismal development hemopoiesis negative regulation of developmental process regulation of regulatory T cell differentiation negative regulation of cell development regulatory T cell differentiation regulation of hemopoiesis	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular region
B [auth M], D [auth L]	Fab light chain	-	-	-
A [auth I], C [auth H]	Fab heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E [auth B], F [auth A]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
E [auth B], F [auth A]	IPR003599	Immunoglobulin domain subtype	Domain
E [auth B], F [auth A]	IPR015621	Interleukin-1 receptor family	Family
E [auth B], F [auth A]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
E [auth B], F [auth A]	IPR007110	Immunoglobulin-like domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
E [auth B], F [auth A]	Pharos: P18627	atypical teratoid rhabdoid tumor common variable immunodeficiency lung disease psoriasis cancer cutaneous lupus erythematosus medulloblastoma Unresectable or metastatic melanoma colorectal cancer large cell medulloblastoma osteosarcoma

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.