Annotations: 9WWH

Crystal structure of IL-33 and antibody Tozorakimab fab binary complex

External Resource: Annotation

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

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L], D [auth B]	Light Chain	IGLV3	Lambda	interleukin-33 (109-270)	SAbDab (2026-04-24)
A [auth H], C [auth A]	Heavy Chain	IGHV3	-	interleukin-33 (109-270)	SAbDab (2026-04-24)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B [auth L], D [auth B]	Tozorakimab	IL33	Therapeutic SAbDab (2026-04-24)
A [auth H], C [auth A]	Tozorakimab	IL33	Therapeutic SAbDab (2026-04-24)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
E [auth C], F [auth D]	PF15095	Interleukin 33 (IL33_bt)	Interleukin 33	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth C], F [auth D]	Interleukin-33 (109-270)	protein binding binding signaling receptor binding cytokine receptor binding interleukin-33 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 defense response response to stimulus regulation of response to external stimulus negative regulation of inflammatory response negative regulation of biological process regulation of response to wounding response to stress regulation of response to stress response to wounding regulation of biological process regulation of inflammatory response to wounding defense response negative regulation of response to stimulus biological regulation regulation of defense response response to stimulus regulation of response to external stimulus negative regulation of inflammatory response negative regulation of biological process regulation of response to wounding response to stress regulation of response to stress response to wounding regulation of biological process regulation of inflammatory response to wounding defense response negative regulation of response to stimulus biological regulation response to external stimulus regulation of inflammatory response negative regulation of response to wounding negative regulation of inflammatory response to wounding regulation of response to stimulus negative regulation of response to external stimulus inflammatory response to wounding negative regulation of defense response inflammatory response multicellular organismal process regulation of cellular process positive regulation of biological process positive regulation of macromolecule biosynthetic process positive regulation of metabolic process regulation of interleukin-5 production positive regulation of biosynthetic process regulation of cytokine production cytokine production regulation of multicellular organismal process positive regulation of macromolecule metabolic process interleukin-5 production positive regulation of cellular process regulation of biosynthetic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process positive regulation of gene expression positive regulation of multicellular organismal process regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process positive regulation of cytokine production regulation of metabolic process positive regulation of interleukin-5 production regulation of macrophage activation positive regulation of macrophage activation regulation of leukocyte activation cell activation regulation of cell activation myeloid leukocyte activation leukocyte activation macrophage activation positive regulation of cell activation immune system process positive regulation of leukocyte activation regulation of immune system process positive regulation of immune system process positive regulation of response to stimulus positive regulation of response to external stimulus positive regulation of inflammatory response positive regulation of defense response interleukin-13 production positive regulation of interleukin-13 production regulation of interleukin-13 production interleukin-6 production positive regulation of interleukin-6 production regulation of interleukin-6 production macrophage activation involved in immune response immune response cell activation involved in immune response myeloid cell activation involved in immune response immune effector process microglial cell activation involved in immune response leukocyte activation involved in inflammatory response leukocyte activation involved in immune response microglial cell activation glial cell activation neuroinflammatory response regulation of immune effector process immunoglobulin production negative regulation of cellular process negative regulation of macromolecule metabolic process negative regulation of immunoglobulin production production of molecular mediator of immune response negative regulation of metabolic process negative regulation of immune effector process negative regulation of production of molecular mediator of immune response negative regulation of gene expression regulation of immunoglobulin production negative regulation of immune system process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of production of molecular mediator of immune response cellular response to stimulus cell surface receptor signaling pathway signaling interleukin-33-mediated signaling pathway response to cytokine cytokine-mediated signaling pathway cell communication response to peptide response to chemical cellular response to cytokine stimulus signal transduction positive regulation of glycoprotein metabolic process positive regulation of protein metabolic process carbohydrate derivative metabolic process regulation of primary metabolic process protein metabolic process regulation of glycoprotein biosynthetic process positive regulation of glycoprotein biosynthetic process carbohydrate derivative biosynthetic process regulation of protein metabolic process glycoprotein biosynthetic process primary metabolic process glycoprotein metabolic process regulation of glycoprotein metabolic process regulation of leukocyte proliferation negative regulation of cell population proliferation cell population proliferation negative regulation of macrophage proliferation leukocyte proliferation negative regulation of leukocyte proliferation macrophage proliferation regulation of cell population proliferation regulation of macrophage proliferation cell death extrinsic apoptotic signaling pathway apoptotic signaling pathway apoptotic process programmed cell death positive regulation of type 2 immune response type 2 immune response positive regulation of immune response regulation of type 2 immune response regulation of immune response positive regulation of proteasomal protein catabolic process catabolic process proteasome-mediated ubiquitin-dependent protein catabolic process regulation of ubiquitin-dependent protein catabolic process macromolecule catabolic process positive regulation of ubiquitin-dependent protein catabolic process modification-dependent macromolecule catabolic process proteasomal protein catabolic process protein catabolic process regulation of catabolic process positive regulation of protein catabolic process positive regulation of catabolic process regulation of proteasomal ubiquitin-dependent protein catabolic process modification-dependent protein catabolic process regulation of proteasomal protein catabolic process positive regulation of proteasomal ubiquitin-dependent protein catabolic process ubiquitin-dependent protein catabolic process regulation of protein catabolic process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains negative regulation of T-helper 1 type immune response regulation of adaptive immune response negative regulation of immune response negative regulation of adaptive immune response T-helper 1 type immune response adaptive immune response regulation of T-helper 1 type immune response negative regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains establishment of protein localization cellular localization nucleocytoplasmic transport transport nuclear transport intracellular transport protein localization to nucleus establishment of localization localization intercellular transport import into nucleus establishment of protein localization to organelle protein transport establishment of localization in cell macromolecule localization protein localization to organelle protein import into nucleus intracellular protein localization intracellular protein transport regulation of chemokine production chemokine production positive regulation of chemokine production regulation of cellular defense response cellular defense response positive regulation of cellular defense response developmental process myeloid leukocyte differentiation cellular developmental process hemopoiesis macrophage differentiation cell development mononuclear cell differentiation myeloid cell differentiation cell differentiation anatomical structure development leukocyte differentiation positive regulation of immune effector process positive regulation of immunoglobulin production positive regulation of production of molecular mediator of immune response regulation of type II interferon production type II interferon production negative regulation of type II interferon production negative regulation of cytokine production negative regulation of multicellular organismal process microglial cell proliferation nervous system development neurogenesis multicellular organism development gliogenesis glial cell proliferation system development positive regulation of MHC class I biosynthetic process regulation of MHC class I biosynthetic process MHC class I biosynthetic process regulation of MHC class II biosynthetic process MHC class II biosynthetic process positive regulation of MHC class II biosynthetic process negative regulation of locomotion regulation of cell motility regulation of leukocyte migration leukocyte migration negative regulation of leukocyte migration regulation of locomotion regulation of cell migration negative regulation of cell motility cell migration cell motility negative regulation of cell migration locomotion RNA metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process transcription by RNA polymerase II negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of transcription by RNA polymerase II negative regulation of DNA-templated transcription negative regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process nucleic acid metabolic process regulation of DNA-templated transcription negative regulation of RNA metabolic process regulation of tumor necrosis factor production positive regulation of tumor necrosis factor superfamily cytokine production tumor necrosis factor superfamily cytokine production positive regulation of tumor necrosis factor production tumor necrosis factor production regulation of tumor necrosis factor superfamily cytokine production regulation of interleukin-4 production positive regulation of interleukin-4 production interleukin-4 production biological process involved in interspecies interaction between organisms defense response to virus response to other organism response to external biotic stimulus response to virus response to biotic stimulus positive regulation of neuroinflammatory response regulation of neuroinflammatory response positive regulation of DNA-templated transcription positive regulation of transcription by RNA polymerase II positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process defense response to symbiont antibacterial innate immune response defense response to bacterium defense response to other organism response to bacterium innate immune response	membrane-bounded organelle intracellular anatomical structure transport vesicle intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cellular anatomical structure cytoplasmic vesicle organelle cytoplasm vesicle nucleus membrane-enclosed lumen membrane-bounded organelle intracellular anatomical structure transport vesicle intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cellular anatomical structure cytoplasmic vesicle organelle cytoplasm vesicle nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen membraneless organelle intracellular membraneless organelle chromosome extracellular region
B [auth L], D [auth B]	Tozorakimab-Light chain	-	-	-
A [auth H], C [auth A]	Tozorakimab-Heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E [auth C], F [auth D]	IPR026145	Interleukin-33	Family
E [auth C], F [auth D]	IPR053902	Interleukin 33, C-terminal	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
E [auth C], F [auth D]	: O95760	asthma pneumonia Liver Cirrhosis, Experimental kidney disease hypereosinophilic syndrome interstitial cystitis large cell medulloblastoma lung adenocarcinoma malignant glioma adenoma medulloblastoma allergic disease non-small cell lung carcinoma astrocytic tumor Sjogren syndrome asthma pneumonia Liver Cirrhosis, Experimental kidney disease hypereosinophilic syndrome interstitial cystitis large cell medulloblastoma lung adenocarcinoma malignant glioma adenoma medulloblastoma allergic disease non-small cell lung carcinoma astrocytic tumor Sjogren syndrome breast cancer dermatitis, atopic invasive ductal breast carcinoma lung cancer malignant mesothelioma adrenal cortex adenoma nasal cavity disease allergic rhinitis osteosarcoma pneumonitis atopic eczema subependymal giant cell astrocytoma breast carcinoma ductal breast carcinoma in situ helminthiasis lung carcinoma MALT lymphoma adrenal cortex carcinoma nasopharyngeal carcinoma pilocytic astrocytoma rhinitis autoimmune disease ulcerative colitis dermatitis

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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.