Annotations: 3AL2

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PTCB-BRCT	e3al2A5	A: a/b three-layered sandwiches	X: BRCT domain (From Topology)	H: BRCT domain (From Topology)	T: BRCT domain	F: PTCB-BRCT	ECOD (1.6)
A	BRCT_2_2	e3al2A2	A: a/b three-layered sandwiches	X: BRCT domain (From Topology)	H: BRCT domain (From Topology)	T: BRCT domain	F: BRCT_2_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.10190	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	BRCT domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF23294	TopBP1/SLF1, BRCT domain (BRCT_TopB1_SLF1)	TopBP1/SLF1, BRCT domain	This entry represents a BRCT domain found in TopBP1 (also known as DNA topoisomerase II-beta-binding protein 1) and SLF1 (SMC5-SMC6 complex localization factor protein 1). TopBP1 functions in DNA replication and damage response. It binds double-stran ...	This entry represents a BRCT domain found in TopBP1 (also known as DNA topoisomerase II-beta-binding protein 1) and SLF1 (SMC5-SMC6 complex localization factor protein 1). TopBP1 functions in DNA replication and damage response. It binds double-stranded DNA breaks and nicks as well as single-stranded DNA [1]. SLF1 plays a role in the DNA damage response (DDR) pathway by regulating postreplication repair of UV-damaged DNA and genomic stability maintenance [2]. This entry corresponds to the eight BRCT domain of TopBP1 and the second one in SLF1.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	DNA topoisomerase 2-binding protein 1	chromatin-protein adaptor activity protein-macromolecule adaptor activity molecular adaptor activity DNA binding binding nucleic acid binding enzyme regulator activity protein serine/threonine kinase activator activity kinase activator activity enzyme activator activity molecular function activator activity molecular function regulator activity protein kinase activator activity protein kinase regulator activity chromatin-protein adaptor activity protein-macromolecule adaptor activity molecular adaptor activity DNA binding binding nucleic acid binding enzyme regulator activity protein serine/threonine kinase activator activity kinase activator activity enzyme activator activity molecular function activator activity molecular function regulator activity protein kinase activator activity protein kinase regulator activity kinase regulator activity identical protein binding protein binding phosphorylation-dependent protein binding modification-dependent protein binding	cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process regulation of cellular process regulation of cell cycle phase transition signaling G2/M transition of mitotic cell cycle negative regulation of biological process negative regulation of cell cycle cell cycle phase transition intracellular signal transduction cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process regulation of cellular process regulation of cell cycle phase transition signaling G2/M transition of mitotic cell cycle negative regulation of biological process negative regulation of cell cycle cell cycle phase transition intracellular signal transduction mitotic cell cycle negative regulation of mitotic cell cycle cell communication mitotic G2/M transition checkpoint regulation of mitotic cell cycle mitotic DNA integrity checkpoint signaling negative regulation of cellular process negative regulation of cell cycle phase transition signal transduction cell cycle DNA replication checkpoint signaling regulation of cell cycle cell cycle process cell cycle G2/M phase transition regulation of biological process mitotic DNA replication checkpoint signaling negative regulation of mitotic cell cycle phase transition regulation of G2/M transition of mitotic cell cycle regulation of cell cycle process biological regulation DNA integrity checkpoint signaling regulation of cell cycle G2/M phase transition negative regulation of cell cycle process cell cycle checkpoint signaling regulation of mitotic cell cycle phase transition mitotic cell cycle checkpoint signaling mitotic cell cycle process negative regulation of cell cycle G2/M phase transition negative regulation of G2/M transition of mitotic cell cycle mitotic cell cycle phase transition nucleobase-containing compound metabolic process DNA-templated DNA replication DNA replication DNA replication initiation metabolic process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process double-strand break repair via classical nonhomologous end joining double-strand break repair double-strand break repair via nonhomologous end joining DNA repair cellular component organization organelle organization chromosome organization cellular component organization or biogenesis localization protein localization to chromosome protein localization to organelle macromolecule localization protein localization to site of double-strand break intracellular protein localization homologous recombination DNA recombination response to ionizing radiation response to radiation response to abiotic stimulus DNA damage checkpoint signaling mitotic G2 DNA damage checkpoint signaling mitotic DNA damage checkpoint signaling signal transduction in response to DNA damage recombinational repair double-strand break repair via homologous recombination double-strand break repair via alternative nonhomologous end joining broken chromosome clustering	intracellular organelle cellular anatomical structure intracellular anatomical structure cytoskeleton spindle organelle membraneless organelle intracellular membraneless organelle spindle pole microtubule cytoskeleton membrane-bounded organelle condensed nuclear chromosome nucleus membrane-enclosed lumen intracellular organelle cellular anatomical structure intracellular anatomical structure cytoskeleton spindle organelle membraneless organelle intracellular membraneless organelle spindle pole microtubule cytoskeleton membrane-bounded organelle condensed nuclear chromosome nucleus membrane-enclosed lumen nuclear chromosome chromosome intracellular membrane-bounded organelle intracellular organelle lumen organelle lumen condensed chromosome nuclear lumen actin cytoskeleton centrosome microtubule organizing center cell periphery plasma membrane membrane nucleoplasm protein-containing complex BRCA1-B complex nuclear protein-containing complex male germ cell nucleus germ cell nucleus site of double-strand break site of DNA damage nuclear body PML body

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR001357	BRCT domain	Domain
A	IPR036420	BRCT domain superfamily	Homologous Superfamily
A	IPR057595	TopBP1/SLF1, BRCT domain	Domain
A	IPR035960	Secretoglobin superfamily	Homologous Superfamily
A	IPR049936	TopBP1, eighth BRCT domain	Domain
A	IPR044737	TopBP1, first BRCT domain	Domain
A	IPR049542	TopBP1-like, BRCT0 domain	Domain
A	IPR059215	DNA topoisomerase 2-binding protein 1-like, second BRCT domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: Q92547	B-cell chronic lymphocytic leukemia lymphoplasmacytic lymphoma medulloblastoma pancreatic intraductal papillary-mucinous neoplasm diabetes mellitus malignant colon neoplasm non-small cell lung carcinoma lung cancer malignant mesothelioma ovarian cancer

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.