2VXT | pdb_00002vxt

Crystal structure of human IL-18 complexed to murine reference antibody 125-2H Fab

External Resource: Annotation

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

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth L]	d2vxtl2	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)
C [auth L]	d2vxtl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	MOUSE (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
B [auth I]	d2vxti_	All beta proteins	beta-Trefoil	Cytokine	Interleukin-1 (IL-1)	automated matches	HUMAN (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A [auth H]	d2vxth_	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)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B [auth I]	SCOP2B Superfamily	Cytokine	8036000	3000648	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)
C [auth L]	Calx-beta	e2vxtL1	A: a/b three-layered sandwiches	X: TIM beta/alpha-barrel	H: FAD-dependent thiol oxidase	T: FAD-dependent thiol oxidase	F: Calx-beta	ECOD (v294.1)
B [auth I]	Glyco_hydro_3	e2vxtI1	A: a/b three-layered sandwiches	X: TIM beta/alpha-barrel	H: FAD-dependent thiol oxidase	T: FAD-dependent thiol oxidase	F: Glyco_hydro_3	ECOD (v294.1)
A [auth H]	Cu-oxidase_3	e2vxtH1	A: a/b three-layered sandwiches	X: TIM beta/alpha-barrel	H: FAD-dependent thiol oxidase	T: FAD-dependent thiol oxidase	F: Cu-oxidase_3	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth I]	2.80.10.50	Mainly Beta	Trefoil	Trefoil (Acidic Fibroblast Growth Factor, subunit A)		CATH (4.3.0)
A [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
C [auth L]	125-2H Fab	L-KAPPA	Mus musculus (house mouse)	IGKV9-12001, IGKJ201, IGKC01, IGKC02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202612-0)
A [auth H]	125-2H Fab	VH-CH1	Mus musculus (house mouse)	IGHV1S13501, IGHJ301, IGHG1*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202612-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth L]	Light Chain	IGKV9	Kappa	interleukin-18	SAbDab (2026-03-27)
A [auth H]	Heavy Chain	IGHV1	-	interleukin-18	SAbDab (2026-03-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B [auth I]	PF00340	Interleukin-1 / 18 (IL1)	Interleukin-1 / 18	This family includes interleukin-1 and interleukin-18.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth L]	MURINE IGG 125-2H	-	-	-
B [auth I]	INTERLEUKIN-18	protein binding binding signaling receptor binding cytokine receptor binding interleukin-18 receptor binding molecular function activator activity molecular function regulator activity cytokine activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity	regulation of biological process cell adhesion regulation of cellular process regulation of cell adhesion biological regulation cellular process cellular response to stimulus cell surface receptor signaling pathway response to stimulus signaling response to cytokine cytokine-mediated signaling pathway cell communication response to peptide regulation of biological process cell adhesion regulation of cellular process regulation of cell adhesion biological regulation cellular process cellular response to stimulus cell surface receptor signaling pathway response to stimulus signaling response to cytokine cytokine-mediated signaling pathway cell communication response to peptide response to chemical cellular response to cytokine stimulus signal transduction adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains multicellular organismal process regulation of immune effector process lymphocyte mediated immunity T cell mediated immunity positive regulation of leukocyte mediated immunity T cell cytokine production positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of immune response T-helper 1 cell cytokine production cytokine production leukocyte mediated immunity regulation of immune system process positive regulation of macromolecule metabolic process positive regulation of adaptive immune response positive regulation of T cell cytokine production positive regulation of immune system process regulation of T cell mediated immunity regulation of cytokine production involved in immune response immune response regulation of adaptive immune response T-helper 1 type immune response regulation of T-helper 1 type immune response immune effector process regulation of gene expression regulation of leukocyte mediated immunity biosynthetic process regulation of response to stimulus positive regulation of production of molecular mediator of immune response positive regulation of multicellular organismal process regulation of immune response metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of production of molecular mediator of immune response positive regulation of cytokine production regulation of metabolic process positive regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of lymphocyte mediated immunity positive regulation of T-helper 1 cell cytokine production positive regulation of biological process regulation of T-helper 1 cell cytokine production positive regulation of response to stimulus regulation of T cell cytokine production CD4-positive, alpha-beta T cell cytokine production regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of biosynthetic process regulation of cytokine production positive regulation of immune effector process regulation of multicellular organismal process cytokine production involved in immune response positive regulation of cellular process production of molecular mediator of immune response regulation of biosynthetic process positive regulation of T-helper 1 type immune response regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process adaptive immune response regulation of lymphocyte mediated immunity positive regulation of gene expression immune system process positive regulation of T cell mediated immunity positive regulation of cytokine production involved in immune response regulation of defense response regulation of response to external stimulus defense response response to external stimulus regulation of inflammatory response positive regulation of response to external stimulus positive regulation of inflammatory response regulation of response to stress response to stress positive regulation of defense response inflammatory response developmental process establishment of skin barrier epithelium development skin development skin epidermis development epidermis development anatomical structure development animal organ development tissue development interleukin-13 production positive regulation of interleukin-13 production regulation of interleukin-13 production cell population proliferation chemical homeostasis homeostatic process triglyceride homeostasis acylglycerol homeostasis lipid homeostasis cell-cell signaling regulation of alpha-beta T cell activation regulation of leukocyte activation regulation of cell activation positive regulation of T cell differentiation regulation of cell development multicellular organism development type 2 immune response T cell activation cell differentiation regulation of type 2 immune response regulation of T-helper cell differentiation alpha-beta T cell activation positive regulation of CD4-positive, alpha-beta T cell differentiation T-helper cell differentiation positive regulation of cell development regulation of leukocyte cell-cell adhesion positive regulation of alpha-beta T cell differentiation regulation of developmental process cell development positive regulation of leukocyte cell-cell adhesion CD4-positive, alpha-beta T cell differentiation positive regulation of T-helper cell differentiation positive regulation of cell-cell adhesion regulation of T cell differentiation positive regulation of lymphocyte activation alpha-beta T cell differentiation T cell activation involved in immune response positive regulation of cell differentiation leukocyte activation involved in immune response regulation of T-helper 2 cell differentiation regulation of cell-cell adhesion hemopoiesis cell activation positive regulation of T-helper 2 cell differentiation regulation of CD4-positive, alpha-beta T cell activation regulation of lymphocyte activation regulation of leukocyte differentiation mononuclear cell differentiation regulation of cell differentiation lymphocyte differentiation cell activation involved in immune response positive regulation of developmental process positive regulation of cell activation positive regulation of leukocyte activation T cell differentiation positive regulation of T cell activation positive regulation of alpha-beta T cell activation leukocyte differentiation cellular developmental process regulation of CD4-positive, alpha-beta T cell differentiation regulation of alpha-beta T cell differentiation lymphocyte activation leukocyte cell-cell adhesion leukocyte activation positive regulation of CD4-positive, alpha-beta T cell activation cell-cell adhesion alpha-beta T cell activation involved in immune response positive regulation of hemopoiesis CD4-positive, alpha-beta T cell activation T-helper 2 cell differentiation lymphocyte activation involved in immune response regulation of lymphocyte differentiation regulation of multicellular organismal development positive regulation of cell adhesion regulation of T cell activation T cell differentiation involved in immune response positive regulation of type 2 immune response regulation of hemopoiesis positive regulation of leukocyte differentiation positive regulation of lymphocyte differentiation positive regulation of tissue remodeling tissue remodeling regulation of tissue remodeling regulation of chemokine production chemokine production positive regulation of chemokine production natural killer cell activation regulation of smooth muscle cell proliferation positive regulation of cell population proliferation smooth muscle cell proliferation positive regulation of smooth muscle cell proliferation regulation of cell population proliferation muscle cell proliferation positive regulation of DNA-templated transcription RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of transcription by RNA polymerase II primary metabolic process positive regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process regulation of DNA-templated transcription blood vessel morphogenesis tube development angiogenesis vasculature development circulatory system development anatomical structure morphogenesis tube morphogenesis anatomical structure formation involved in morphogenesis blood vessel development system development negative regulation of developmental process negative regulation of biological process muscle structure development negative regulation of myoblast differentiation negative regulation of cellular process regulation of myoblast differentiation negative regulation of cell differentiation myoblast differentiation neutrophil activation myeloid leukocyte activation granulocyte activation biological process involved in interspecies interaction between organisms response to lipid response to other organism cellular response to lipopolysaccharide response to oxygen-containing compound cellular response to molecule of bacterial origin response to lipopolysaccharide cellular response to oxygen-containing compound response to biotic stimulus cellular response to biotic stimulus cellular response to chemical stimulus response to bacterium cellular response to lipid response to external biotic stimulus response to molecule of bacterial origin sterol homeostasis cholesterol homeostasis positive regulation of natural killer cell proliferation leukocyte proliferation lymphocyte proliferation positive regulation of mononuclear cell proliferation regulation of natural killer cell activation regulation of lymphocyte proliferation regulation of leukocyte proliferation positive regulation of lymphocyte proliferation positive regulation of natural killer cell activation natural killer cell proliferation mononuclear cell proliferation positive regulation of leukocyte proliferation regulation of mononuclear cell proliferation regulation of natural killer cell proliferation positive regulation of cell communication regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction positive regulation of signal transduction regulation of signal transduction intracellular signal transduction regulation of intracellular signal transduction intracellular signaling cassette regulation of signaling positive regulation of intracellular signal transduction positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction regulation of cell communication phosphatidylinositol 3-kinase/protein kinase B signal transduction positive regulation of signaling macrophage derived foam cell differentiation foam cell differentiation regulation of macrophage derived foam cell differentiation positive regulation of macrophage derived foam cell differentiation defense response to symbiont leukocyte mediated cytotoxicity defense response to other organism natural killer cell mediated cytotoxicity innate immune response natural killer cell mediated immunity cell killing sleep positive regulation of T cell proliferation positive regulation of activated T cell proliferation regulation of activated T cell proliferation activated T cell proliferation T cell proliferation regulation of T cell proliferation adaptive thermogenesis multicellular organismal-level homeostasis regulation of cold-induced thermogenesis cold-induced thermogenesis temperature homeostasis positive regulation of cold-induced thermogenesis positive regulation of phosphorylation positive regulation of phosphate metabolic process peptidyl-amino acid modification phosphate-containing compound metabolic process protein modification process phosphorus metabolic process positive regulation of protein phosphorylation tyrosine phosphorylation of STAT protein protein phosphorylation positive regulation of phosphorus metabolic process phosphorylation regulation of protein metabolic process macromolecule modification regulation of phosphorus metabolic process cell surface receptor signaling pathway via STAT regulation of protein modification process regulation of protein phosphorylation positive regulation of protein metabolic process peptidyl-tyrosine modification positive regulation of peptidyl-tyrosine phosphorylation positive regulation of protein modification process protein metabolic process regulation of tyrosine phosphorylation of STAT protein regulation of peptidyl-tyrosine phosphorylation positive regulation of tyrosine phosphorylation of STAT protein regulation of phosphorylation peptidyl-tyrosine phosphorylation cell surface receptor signaling pathway via JAK-STAT granulocyte macrophage colony-stimulating factor production positive regulation of granulocyte macrophage colony-stimulating factor production regulation of granulocyte macrophage colony-stimulating factor production regulation of non-canonical NF-kappaB signal transduction non-canonical NF-kappaB signal transduction positive regulation of non-canonical NF-kappaB signal transduction interleukin-17 production regulation of interleukin-17 production positive regulation of interleukin-17 production positive regulation of neuroinflammatory response regulation of neuroinflammatory response neuroinflammatory response cellular response to interleukin-18 response to interleukin-18 interleukin-18-mediated signaling pathway regulation of type II interferon production type II interferon production positive regulation of type II interferon production defense response to Gram-positive bacterium defense response to bacterium regulation of NK T cell proliferation positive regulation of NK T cell proliferation positive regulation of alpha-beta T cell proliferation alpha-beta T cell proliferation NK T cell proliferation positive regulation of NK T cell activation regulation of alpha-beta T cell proliferation regulation of NK T cell activation NK T cell activation	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol extracellular region
A [auth H]	MURINE IGG 125-2H	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth I]	IPR015529	Interleukin-18	Family
B [auth I]	IPR008996	Cytokine IL1/FGF	Homologous Superfamily
B [auth I]	IPR000975	Interleukin-1 family	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B [auth I]	Pharos: Q14116	autoimmune hepatitis leishmaniasis cancer glomerulonephritis rheumatoid arthritis metabolic syndrome X sarcoidosis Neoplasm Metastasis heart valve disease pneumonia prostate cancer brain ischemia contact dermatitis allergic contact dermatitis urticaria autoimmune hepatitis leishmaniasis cancer glomerulonephritis rheumatoid arthritis metabolic syndrome X sarcoidosis Neoplasm Metastasis heart valve disease pneumonia prostate cancer brain ischemia contact dermatitis allergic contact dermatitis urticaria allergic disease polyomavirus infectious disease calcinosis malignant pancreatic neoplasm depressive disorder esophageal adenocarcinoma oral cavity neoplasm gastric carcinoma peripheral nervous system disease arthritic joint disease inborn carbohydrate metabolic disorder invasive ductal breast carcinoma schizophrenia lung cancer spina bifida malignant mesothelioma type 2 diabetes mellitus osteosarcoma peripheral neuropathy pneumonitis atherosclerosis inflammatory bowel disease benign neoplasm kidney disease Sjogren syndrome lung carcinoma subependymal giant cell astrocytoma drug-induced liver injury obesity disorder ovarian cancer head and neck cancer pilocytic astrocytoma autoimmune disease interstitial cystitis psoriasis bipolar disorder large cell medulloblastoma skin disease malignant glioma

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.