Annotations: 9P4C

Crystal structure of Mesothelin C-terminal peptide-RO4 Fab complex

External Resource: Annotation

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

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth H]	Heavy Chain	IGHV1	-	mesothelin, cleaved form	SAbDab (2026-06-12)
A [auth L]	Light Chain	IGKV1	Kappa	mesothelin, cleaved form	SAbDab (2026-06-12)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth M]	Mesothelin, cleaved form	-	cell adhesion cell-matrix adhesion cell-substrate adhesion cellular process	cell surface cellular anatomical structure membrane side of membrane cell periphery plasma membrane membrane-bounded organelle intracellular organelle intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system cell surface cellular anatomical structure membrane side of membrane cell periphery plasma membrane membrane-bounded organelle intracellular organelle intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum extracellular region
B [auth H]	Heavy chain of the RO4 fab fragment	-	-	-
A [auth L]	Light chain of the RO4 Fab fragment	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth M]	IPR026664	Stereocilin-related	Family
C [auth M]	IPR010335	Mesothelin	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth M]	: Q13421	cholangiocarcinoma pleural disease malignant mesothelioma pancreatic ductal adenocarcinoma cancer Lymphatic Metastasis mesothelial neoplasm adenocarcinoma intrahepatic cholangiocarcinoma granular cell carcinoma malignant pancreatic neoplasm ovarian cancer tubular adenocarcinoma hereditary diffuse gastric adenocarcinoma attention deficit hyperactivity disorder, inattentive type cholangiocarcinoma pleural disease malignant mesothelioma pancreatic ductal adenocarcinoma cancer Lymphatic Metastasis mesothelial neoplasm adenocarcinoma intrahepatic cholangiocarcinoma granular cell carcinoma malignant pancreatic neoplasm ovarian cancer tubular adenocarcinoma hereditary diffuse gastric adenocarcinoma attention deficit hyperactivity disorder, inattentive type ovarian disease bile duct cancer pancreatic intraductal papillary-mucinous neoplasm cystic fibrosis esophageal adenocarcinoma gastric neoplasm mesothelioma non-small cell lung carcinoma benign mesothelioma ovarian neoplasm bone disease pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia cribriform carcinoma psoriasis endometrial carcinoma lung carcinoma nasopharyngeal carcinoma benign neoplasm pancreatic neoplasm cribriform carcinoma of breast endometrioid adenocarcinoma gastric cancer

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
B [auth H]	PCA	Parent Component: GLN : AA0031 : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

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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.