Annotations: 8P6I

Crystal structure of the 139H2 Fab fragment bound to Muc1 peptide epitope

External Resource: Annotation

Domain Annotation: ECOD Classification
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)
C [auth L]	Pestivirus_E2	e8p6iL01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Pestivirus_E2	ECOD (v294.2)
B [auth H]	Pestivirus_E2	e8p6iH01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Pestivirus_E2	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth L], F [auth l]	Light Chain	IGKV8	Kappa	mucin-1	SAbDab (2026-05-15)
B [auth H], E [auth h]	Heavy Chain	IGHV1	-	mucin-1	SAbDab (2026-05-15)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth L], F [auth l]	139H2 LC	-	-	-
B [auth H], E [auth h]	139H2 HC	-	-	-
A, D [auth a]	Mucin-1	p53 binding protein binding binding transcription regulator activity transcription coregulator activity DNA binding sequence-specific DNA binding double-stranded DNA binding nucleic acid binding RNA polymerase II transcription regulatory region sequence-specific DNA binding cis-regulatory region sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding transcription regulatory region nucleic acid binding p53 binding protein binding binding transcription regulator activity transcription coregulator activity DNA binding sequence-specific DNA binding double-stranded DNA binding nucleic acid binding RNA polymerase II transcription regulatory region sequence-specific DNA binding cis-regulatory region sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding transcription regulatory region nucleic acid binding RNA polymerase II cis-regulatory region sequence-specific DNA binding	cellular response to stimulus regulation of cellular process response to stimulus negative regulation of biological process regulation of cellular response to stress regulation of signal transduction regulation of intrinsic apoptotic signaling pathway in response to DNA damage regulation of programmed cell death intracellular signal transduction regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator cell communication negative regulation of apoptotic signaling pathway negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator intrinsic apoptotic signaling pathway in response to DNA damage cellular response to stimulus regulation of cellular process response to stimulus negative regulation of biological process regulation of cellular response to stress regulation of signal transduction regulation of intrinsic apoptotic signaling pathway in response to DNA damage regulation of programmed cell death intracellular signal transduction regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator cell communication negative regulation of apoptotic signaling pathway negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator intrinsic apoptotic signaling pathway in response to DNA damage signal transduction intrinsic apoptotic signaling pathway negative regulation of signal transduction by p53 class mediator regulation of biological process negative regulation of programmed cell death regulation of apoptotic process cell death negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage negative regulation of apoptotic process regulation of response to stimulus intrinsic apoptotic signaling pathway by p53 class mediator regulation of apoptotic signaling pathway signaling negative regulation of signaling negative regulation of intracellular signal transduction regulation of intrinsic apoptotic signaling pathway negative regulation of cell communication intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator cellular response to stress regulation of intracellular signal transduction response to stress regulation of response to stress regulation of signal transduction by p53 class mediator negative regulation of cellular process regulation of signaling negative regulation of response to stimulus biological regulation signal transduction by p53 class mediator negative regulation of signal transduction apoptotic signaling pathway negative regulation of intrinsic apoptotic signaling pathway negative regulation of intrinsic apoptotic signaling pathway by p53 class mediator DNA damage response regulation of cell communication cellular process apoptotic process regulation of intrinsic apoptotic signaling pathway by p53 class mediator programmed cell death negative regulation of cell adhesion mediated by integrin regulation of cell adhesion mediated by integrin regulation of cell adhesion negative regulation of cell adhesion cell adhesion cell adhesion mediated by integrin DNA damage response, signal transduction by p53 class mediator signal transduction in response to DNA damage regulation of cell cycle phase transition DNA damage checkpoint signaling negative regulation of cell cycle cell cycle phase transition regulation of cell cycle G1/S phase transition cell cycle G1/S phase transition mitotic cell cycle negative regulation of mitotic cell cycle regulation of mitotic cell cycle mitotic DNA integrity checkpoint signaling mitotic DNA damage checkpoint signaling negative regulation of cell cycle phase transition cell cycle regulation of cell cycle cell cycle process negative regulation of G1/S transition of mitotic cell cycle mitotic G1/S transition checkpoint signaling negative regulation of mitotic cell cycle phase transition regulation of cell cycle process negative regulation of cell cycle G1/S phase transition DNA integrity checkpoint signaling negative regulation of cell cycle process cell cycle checkpoint signaling regulation of mitotic cell cycle phase transition mitotic cell cycle checkpoint signaling mitotic G1 DNA damage checkpoint signaling mitotic cell cycle process regulation of G1/S transition of mitotic cell cycle G1/S transition of mitotic cell cycle mitotic cell cycle phase transition positive regulation of DNA-templated transcription positive regulation of biological process RNA metabolic process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process positive regulation of metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II positive regulation of biosynthetic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of cellular process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of transcription by RNA polymerase II primary metabolic process regulation of macromolecule metabolic process positive regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process regulation of gene expression biosynthetic process positive regulation of RNA biosynthetic process metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process	membrane-bounded organelle intracellular anatomical structure Golgi apparatus membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen Golgi lumen intracellular organelle cellular anatomical structure organelle lumen organelle cytoplasm vesicle membrane-bounded organelle intracellular anatomical structure Golgi apparatus membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen Golgi lumen intracellular organelle cellular anatomical structure organelle lumen organelle cytoplasm vesicle cell periphery apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular membrane-bounded organelle membraneless organelle intracellular membraneless organelle chromatin chromosome nucleus

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, D [auth a]	IPR036364	SEA domain superfamily	Homologous Superfamily
A, D [auth a]	IPR000082	SEA domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, D [auth a]	: P15941	tubulointerstitial kidney disease, autosomal dominant, 2 plasma cell myeloma malignant mesothelioma Crohn disease gastric neoplasm Precancerous Conditions invasive ductal breast carcinoma spina bifida lung cancer ulcerative colitis malignant ependymoma atypical teratoid rhabdoid tumor brain aneurysm myeloid neoplasm cancer tubulointerstitial kidney disease, autosomal dominant, 2 plasma cell myeloma malignant mesothelioma Crohn disease gastric neoplasm Precancerous Conditions invasive ductal breast carcinoma spina bifida lung cancer ulcerative colitis malignant ependymoma atypical teratoid rhabdoid tumor brain aneurysm myeloid neoplasm cancer non-alcoholic fatty liver disease ovarian cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia ductal breast carcinoma in situ gastric adenocarcinoma plasma cell neoplasm glioblastoma psoriasis large cell medulloblastoma transitional cell carcinoma lung carcinoma malignant glioma autosomal dominant medullary cystic kidney disease with or without hyperuricemia malignant pancreatic neoplasm breast carcinoma nasopharyngeal carcinoma non-small cell lung carcinoma congenital anomaly of kidney and urinary tract pancreatic ductal adenocarcinoma dental caries peritoneal neoplasm endometriosis pituitary cancer gastric cancer precancerous condition hereditary diffuse gastric adenocarcinoma Sjogren syndrome lung adenocarcinoma lung disease benign mesothelioma mesothelioma breast disease osteosarcoma pancreatic intraductal papillary-mucinous neoplasm digestive system disease esophageal adenocarcinoma

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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.