Annotations: 9V32

Human claudin 18.2 in complex with the Fab fragment of Zolbetuximab

External Resource: Annotation

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
C [auth L]	Light Chain	IGKV8	Kappa	isoform a2 of claudin-18	SAbDab (2026-05-29)
B [auth H]	Heavy Chain	IGHV1	-	isoform a2 of claudin-18	SAbDab (2026-05-29)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00822	PMP-22/EMP/MP20/Claudin family (PMP22_Claudin)	PMP-22/EMP/MP20/Claudin family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth L]	Fab of Zolbetuximab - Light chain	-	-	-
B [auth H]	Fab of Zolbetuximab - Heavy chain	-	-	-
A	Isoform A2 of Claudin-18	structural molecule activity identical protein binding protein binding binding	developmental process multicellular organismal process developmental growth growth organ growth calcium-independent cell-cell adhesion cell adhesion cell-cell adhesion cellular process cellular component organization cell junction organization tight junction organization cellular component organization or biogenesis cell-cell junction organization developmental process multicellular organismal process developmental growth growth organ growth calcium-independent cell-cell adhesion cell adhesion cell-cell adhesion cellular process cellular component organization cell junction organization tight junction organization cellular component organization or biogenesis cell-cell junction organization multicellular organism development digestive system development tube development anatomical structure development digestive tract development system development localization epithelial fluid transport transport transepithelial transport fluid transport establishment of localization regulation of leukocyte differentiation regulation of cellular process negative regulation of biological process regulation of cell differentiation regulation of cell development skeletal system development cell differentiation regulation of immune system process negative regulation of hemopoiesis regulation of osteoclast development regulation of biological process negative regulation of leukocyte differentiation regulation of myeloid leukocyte differentiation negative regulation of myeloid cell differentiation negative regulation of myeloid leukocyte differentiation osteoclast development negative regulation of multicellular organismal process leukocyte differentiation myeloid leukocyte differentiation cellular developmental process regulation of developmental process cell development regulation of osteoclast differentiation bone cell development osteoclast differentiation negative regulation of cellular process regulation of multicellular organismal process negative regulation of cell differentiation bone development regulation of multicellular organismal development hemopoiesis regulation of myeloid cell differentiation negative regulation of developmental process animal organ development biological regulation negative regulation of osteoclast differentiation negative regulation of cell development negative regulation of osteoclast development myeloid cell differentiation negative regulation of immune system process immune system process myeloid cell development regulation of hemopoiesis response to stimulus response to alcohol response to chemical response to oxygen-containing compound response to ethanol bicellular tight junction assembly apical junction assembly cellular component biogenesis cellular component assembly cell junction assembly tight junction assembly cell-cell junction assembly negative regulation of tissue remodeling homeostatic process negative regulation of bone remodeling regulation of bone remodeling tissue homeostasis regulation of tissue remodeling regulation of bone resorption bone resorption negative regulation of bone resorption multicellular organismal-level homeostasis tissue remodeling bone remodeling anatomical structure homeostasis cell population proliferation epithelial cell proliferation cellular response to stimulus response to endogenous stimulus response to estrogen cellular response to estrogen stimulus cellular response to endogenous stimulus cellular response to chemical stimulus response to hormone cellular response to hormone stimulus regulation of localization regulation of protein localization regulation of protein localization to nucleus protein localization to nucleus negative regulation of protein localization to nucleus macromolecule localization protein localization to organelle intracellular protein localization negative regulation of protein localization negative regulation of signaling signaling response to cytokine regulation of signal transduction negative regulation of cell communication cytokine-mediated signaling pathway cell communication cellular response to tumor necrosis factor tumor necrosis factor-mediated signaling pathway cellular response to cytokine stimulus signal transduction regulation of signaling cell surface receptor signaling pathway regulation of tumor necrosis factor-mediated signaling pathway negative regulation of response to stimulus regulation of cytokine-mediated signaling pathway negative regulation of tumor necrosis factor-mediated signaling pathway negative regulation of signal transduction response to peptide regulation of response to cytokine stimulus negative regulation of response to cytokine stimulus regulation of response to stimulus negative regulation of cytokine-mediated signaling pathway regulation of cell communication response to tumor necrosis factor respiratory tube development lung development respiratory system development lung alveolus development	cell-cell junction cellular anatomical structure anchoring junction cell junction cell periphery plasma membrane membrane apical junction complex bicellular tight junction tight junction lateral plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR006187	Claudin	Family
A	IPR003928	Claudin-18	Family
A	IPR004031	PMP-22/EMP/MP20/Claudin	Family
A	IPR017974	Claudin, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: P56856	Barrett esophagus lung cancer non-small cell lung carcinoma pancreatic intraductal papillary-mucinous neoplasm esophageal adenocarcinoma lung carcinoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia lung adenocarcinoma malignant pancreatic neoplasm pancreatic intraductal papillary-mucinous carcinoma psoriasis

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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.