Annotations: 4HS2

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	BACK	e4hs2A1	A: alpha superhelices	X: Repetitive alpha hairpins	H: BACK domain (From Topology)	T: BACK domain	F: BACK	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.25.40.420	Mainly Alpha	Alpha Horseshoe	Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF24570	BPM/SPOP, BACK domain (BACK_BPM_SPOP)	BPM/SPOP, BACK domain	This entry represent the BACK domain present in BPM proteins from plants, SPOP from animals and related sequences. BPM proteins are part of the Cullin E3 ubiquitin ligase complexes playing a role as substrate-specific adaptors of CUL3-based E3 ligase ...	This entry represent the BACK domain present in BPM proteins from plants, SPOP from animals and related sequences. BPM proteins are part of the Cullin E3 ubiquitin ligase complexes playing a role as substrate-specific adaptors of CUL3-based E3 ligases in the ubiquitin-proteasome pathway [1,2]. They bind at least three families of transcription factors: ERF/AP2 class I, homeobox-leucine zipper and R2R3 MYB, playing an important role in plant flowering, seed development and abiotic stress response [1]. SPOP, also known as HIB homologue 1 or Roadkill homologue 1 in humans, is an adaptor protein that forms a complex with Cul3, cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex, and is involved in ubiquitination of BMI1, H2AFY, and the death-associated protein 6 (DAXX) [4-6]. This domain is involved in dimerization together with the BTB domain (Pfam:PF00651), resulting in linear higher-order oligomers [7].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Speckle-type POZ protein	molecular function inhibitor activity molecular function regulator activity ubiquitin protein ligase binding protein binding binding ubiquitin-like protein ligase binding enzyme binding identical protein binding	protein polyubiquitination primary metabolic process protein ubiquitination macromolecule modification metabolic process cellular process protein metabolic process macromolecule metabolic process post-translational protein modification protein modification process protein modification by small protein conjugation protein modification by small protein conjugation or removal regulation of biological process regulation of cellular process protein polyubiquitination primary metabolic process protein ubiquitination macromolecule modification metabolic process cellular process protein metabolic process macromolecule metabolic process post-translational protein modification protein modification process protein modification by small protein conjugation protein modification by small protein conjugation or removal regulation of biological process regulation of cellular process regulation of protein metabolic process biological regulation regulation of macromolecule metabolic process regulation of primary metabolic process regulation of proteolysis proteolysis regulation of metabolic process catabolic process proteasomal protein catabolic process protein catabolic process proteasome-mediated ubiquitin-dependent protein catabolic process macromolecule catabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process ubiquitin-dependent protein catabolic process	membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membraneless organelle intracellular membrane-bounded organelle intracellular organelle lumen nuclear speck ribonucleoprotein granule intracellular organelle nuclear body cellular anatomical structure nucleoplasm organelle lumen membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membraneless organelle intracellular membrane-bounded organelle intracellular organelle lumen nuclear speck ribonucleoprotein granule intracellular organelle nuclear body cellular anatomical structure nucleoplasm organelle lumen organelle membraneless organelle supramolecular complex nuclear ribonucleoprotein granule nuclear lumen cullin-RING ubiquitin ligase complex protein-containing complex ubiquitin ligase complex catalytic complex transferase complex Cul3-RING ubiquitin ligase complex intracellular protein-containing complex cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR056423	BPM/SPOP, BACK domain	Domain
A	IPR000210	BTB/POZ domain	Domain
A	IPR034089	SPOP, C-terminal BACK domain	Domain
A	IPR008974	TRAF-like	Homologous Superfamily
A	IPR011333	SKP1/BTB/POZ domain superfamily	Homologous Superfamily
A	IPR002083	MATH/TRAF domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: O43791	endometrial carcinoma prostate cancer atypical teratoid rhabdoid tumor familial prostate carcinoma malignant colon neoplasm ovarian cancer Prostatic Neoplasms breast carcinoma glioblastoma prostate adenocarcinoma psoriasis endometrial cancer endometrium carcinoma in situ large cell medulloblastoma osteosarcoma

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.