Annotations: 6MUN

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	PF00240	e6munB1	A: a+b two layers	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: PF00240	ECOD (1.6)
C	PF00240	e6munC1	A: a+b two layers	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: PF00240	ECOD (1.6)
A	PF02809	e6munA1	A: extended segments	X: UIM domain (From Topology)	H: UIM domain (From Topology)	T: UIM domain	F: PF02809	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.10.20.90	Alpha Beta	Roll	Ubiquitin-like (UB roll)	Phosphatidylinositol 3-kinase Catalytic Subunit	CATH (utative)
C	3.10.20.90	Alpha Beta	Roll	Ubiquitin-like (UB roll)	Phosphatidylinositol 3-kinase Catalytic Subunit	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B, C	PF00240	Ubiquitin family (ubiquitin)	Ubiquitin family	This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue) (see Swiss:Q02724), Nedd8 (see Swiss:P29595), Elongin B (see Swiss:Q15370), Rub1 (see Swiss:Q9SHE7), and Parkin (see Swiss:O60260). A number of them are thought to carry ...	This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue) (see Swiss:Q02724), Nedd8 (see Swiss:P29595), Elongin B (see Swiss:Q15370), Rub1 (see Swiss:Q9SHE7), and Parkin (see Swiss:O60260). A number of them are thought to carry a distinctive five-residue motif termed the proteasome-interacting motif (PIM), which may have a biologically significant role in protein delivery to proteasomes and recruitment of proteasomes to transcription sites [5].	Domain
A	PF02809	Ubiquitin interaction motif (UIM)	Ubiquitin interaction motif	-	Motif

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B, C	Ubiquilin-2	polyubiquitin modification-dependent protein binding protein binding binding modification-dependent protein binding molecular condensate scaffold activity protein-macromolecule adaptor activity molecular adaptor activity identical protein binding	regulation of biological process catabolic process regulation of cellular process macroautophagy cellular metabolic process biological regulation autophagy regulation of cellular metabolic process regulation of catabolic process regulation of autophagy cellular catabolic process regulation of macroautophagy regulation of cellular catabolic process metabolic process regulation of biological process catabolic process regulation of cellular process macroautophagy cellular metabolic process biological regulation autophagy regulation of cellular metabolic process regulation of catabolic process regulation of autophagy cellular catabolic process regulation of macroautophagy regulation of cellular catabolic process metabolic process cellular process regulation of metabolic process process utilizing autophagic mechanism autophagosome assembly organelle assembly vacuole organization autophagosome organization cellular component biogenesis cellular component organization organelle organization cellular component assembly cellular component organization or biogenesis regulation of cellular component organization regulation of autophagosome assembly regulation of vacuole organization regulation of cellular component biogenesis regulation of organelle organization regulation of organelle assembly negative regulation of clathrin-dependent endocytosis import into cell regulation of localization transport negative regulation of biological process negative regulation of transport negative regulation of endocytosis vesicle-mediated transport localization clathrin-dependent endocytosis negative regulation of cellular process regulation of endocytosis negative regulation of cellular component organization negative regulation of receptor-mediated endocytosis regulation of transport regulation of receptor-mediated endocytosis regulation of vesicle-mediated transport establishment of localization receptor-mediated endocytosis endocytosis regulation of clathrin-dependent endocytosis cellular response to stimulus negative adaptation of signaling pathway regulation of G protein-coupled receptor internalization receptor internalization response to stimulus regulation of signal transduction regulation of receptor internalization negative regulation of G protein-coupled receptor signaling pathway cell communication signal transduction regulation of G protein-coupled receptor signaling pathway regulation of response to stimulus adaptation of signaling pathway G protein-coupled receptor signaling pathway negative regulation of signaling signaling desensitization of G protein-coupled receptor signaling pathway negative regulation of cell communication G protein-coupled receptor internalization regulation of signaling negative regulation of G protein-coupled receptor internalization negative regulation of response to stimulus negative regulation of signal transduction regulation of cell communication negative regulation of receptor internalization	membrane-bounded organelle intracellular organelle intracellular anatomical structure cytoplasmic vesicle organelle intracellular vesicle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle vesicle vacuole autophagosome cytosol cell periphery membrane-bounded organelle intracellular organelle intracellular anatomical structure cytoplasmic vesicle organelle intracellular vesicle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle vesicle vacuole autophagosome cytosol cell periphery plasma membrane membrane nucleus
A	26S proteasome non-ATPase regulatory subunit 4	polyubiquitin modification-dependent protein binding protein binding binding modification-dependent protein binding molecular adaptor activity RNA binding organic cyclic compound binding nucleic acid binding identical protein binding	organonitrogen compound catabolic process organonitrogen compound metabolic process catabolic process proteolysis involved in protein catabolic process primary metabolic process proteasomal protein catabolic process protein catabolic process proteasome-mediated ubiquitin-dependent protein catabolic process macromolecule catabolic process organic substance metabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process proteolysis ubiquitin-dependent protein catabolic process organonitrogen compound catabolic process organonitrogen compound metabolic process catabolic process proteolysis involved in protein catabolic process primary metabolic process proteasomal protein catabolic process protein catabolic process proteasome-mediated ubiquitin-dependent protein catabolic process macromolecule catabolic process organic substance metabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process proteolysis ubiquitin-dependent protein catabolic process metabolic process protein metabolic process macromolecule metabolic process organic substance catabolic process	proteasome accessory complex protein-containing complex intracellular anatomical structure catalytic complex peptidase complex proteasome complex endopeptidase complex cellular anatomical entity intracellular protein-containing complex proteasome regulatory particle proteasome regulatory particle, base subcomplex cytoplasm cytosol membrane-bounded organelle proteasome accessory complex protein-containing complex intracellular anatomical structure catalytic complex peptidase complex proteasome complex endopeptidase complex cellular anatomical entity intracellular protein-containing complex proteasome regulatory particle proteasome regulatory particle, base subcomplex cytoplasm cytosol membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, C	IPR016024	Armadillo-type fold	Homologous Superfamily
B, C	IPR000626	Ubiquitin-like domain	Domain
B, C	IPR015496	Ubiquilin	Family
B, C	IPR029071	Ubiquitin-like domain superfamily	Homologous Superfamily
B, C	IPR009060	UBA-like superfamily	Homologous Superfamily
B, C	IPR015940	Ubiquitin-associated domain	Domain
B, C	IPR006636	Heat shock chaperonin-binding	Domain
A	IPR036465	von Willebrand factor A-like domain superfamily	Homologous Superfamily
A	IPR002035	von Willebrand factor, type A	Domain
A	IPR003903	Ubiquitin interacting motif	Conserved Site
A	IPR049590	PSMD4, RAZUL domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B, C	Pharos: Q9UHD9	amyotrophic lateral sclerosis amyotrophic lateral sclerosis type 15 neurodegenerative disease atypical teratoid rhabdoid tumor glioblastoma lung cancer malignant pancreatic neoplasm ovarian cancer dermatomyositis hepatocellular carcinoma malignant ependymoma medulloblastoma plasma cell myeloma astrocytic tumor exocrine pancreatic carcinoma amyotrophic lateral sclerosis amyotrophic lateral sclerosis type 15 neurodegenerative disease atypical teratoid rhabdoid tumor glioblastoma lung cancer malignant pancreatic neoplasm ovarian cancer dermatomyositis hepatocellular carcinoma malignant ependymoma medulloblastoma plasma cell myeloma astrocytic tumor exocrine pancreatic carcinoma large cell medulloblastoma malignant glioma sarcoidosis
A	Pharos: P55036	heart disease ovarian cancer lung cancer plasma cell myeloma myocardial infarction

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 R01GM133198.