Annotations: 4CN0

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	PCI	e4cn0B1	A: a/b three-layered sandwiches	X: DEATH domain	H: HTH	T: winged helix domain	F: PCI	ECOD (v294.1)
A	CBM_4_9	e4cn0A1	A: a/b three-layered sandwiches	X: jelly-roll	H: Galactose-binding domain-like	T: Galactose-binding domain-like	F: CBM_4_9	ECOD (v294.1)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PROTEIN AHNAK2	-	regulation of cellular process RNA metabolic process regulation of primary metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process RNA processing regulation of biosynthetic process RNA splicing regulation of biological process biological regulation primary metabolic process regulation of macromolecule metabolic process regulation of RNA splicing regulation of cellular process RNA metabolic process regulation of primary metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process RNA processing regulation of biosynthetic process RNA splicing regulation of biological process biological regulation primary metabolic process regulation of macromolecule metabolic process regulation of RNA splicing gene expression nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process metabolic process cellular process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol cell periphery sarcolemma plasma membrane membrane T-tubule membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR001478	PDZ domain	Domain
A, B	IPR036034	PDZ superfamily	Homologous Superfamily
A, B	IPR052082	Peripheral myelin sheath structural protein	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: Q8IVF2	ovarian cancer pancreatic intraductal papillary-mucinous neoplasm primitive neuroectodermal tumor ulcerative colitis astrocytic tumor ductal breast carcinoma in situ invasive ductal breast carcinoma lung cancer malignant glioma medulloblastoma non-small cell lung carcinoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia psoriasis cutaneous lupus erythematosus ovarian cancer pancreatic intraductal papillary-mucinous neoplasm primitive neuroectodermal tumor ulcerative colitis astrocytic tumor ductal breast carcinoma in situ invasive ductal breast carcinoma lung cancer malignant glioma medulloblastoma non-small cell lung carcinoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia psoriasis cutaneous lupus erythematosus esophageal adenocarcinoma large cell medulloblastoma malignant colon neoplasm malignant mesothelioma myopathy oligodendroglioma pancreatic intraductal papillary-mucinous carcinoma periodontitis rheumatoid arthritis Duchenne muscular dystrophy glioblastoma lung adenocarcinoma malignant ependymoma malignant pancreatic neoplasm nasopharyngeal carcinoma

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.