Annotations: 3W03

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	XRCC4 C-terminal oligomerization domain-like	8051828	3001502	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	XRCC4 N-terminal domain-like	8051827	3001319	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	XRCC4 C-terminal oligomerization domain-like	8051828	3001502	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	XRCC4 N-terminal domain-like	8051827	3001319	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	XRCC4 N-terminal domain-like	8036633	3001319	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	XRCC4 N-terminal domain-like	8036633	3001319	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	PF06632	e3w03C3	A: beta barrels	X: XRCC4, N-terminal domain-like	H: XRCC4, N-terminal domain (From Topology)	T: XRCC4, N-terminal domain	F: PF06632	ECOD (1.6)
C	F_UNCLASSIFIED	e3w03C2	A: alpha arrays	X: HTH	H: HTH	T: HTH motif inserted in other structures	F: F_UNCLASSIFIED	ECOD (1.6)
C	PF21924	e3w03C1	A: alpha duplicates or obligate multimers	X: XRCC4 C-terminal oligomerization domain (From Topology)	H: XRCC4 C-terminal oligomerization domain (From Topology)	T: XRCC4 C-terminal oligomerization domain	F: PF21924	ECOD (1.6)
D	PF06632	e3w03D1	A: beta barrels	X: XRCC4, N-terminal domain-like	H: XRCC4, N-terminal domain (From Topology)	T: XRCC4, N-terminal domain	F: PF06632	ECOD (1.6)
D	F_UNCLASSIFIED	e3w03D3	A: alpha arrays	X: HTH	H: HTH	T: HTH motif inserted in other structures	F: F_UNCLASSIFIED	ECOD (1.6)
D	PF21924	e3w03D2	A: alpha duplicates or obligate multimers	X: XRCC4 C-terminal oligomerization domain (From Topology)	H: XRCC4 C-terminal oligomerization domain (From Topology)	T: XRCC4 C-terminal oligomerization domain	F: PF21924	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF09302	XLF-Cernunnos, XRcc4-like factor, NHEJ component (XLF)	XLF-Cernunnos, XRcc4-like factor, NHEJ component	-	Family
C, D	PF06632	DNA double-strand break repair and V(D)J recombination protein XRCC4 (XRCC4)	DNA double-strand break repair and V(D)J recombination protein XRCC4	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Non-homologous end-joining factor 1	DNA binding binding organic cyclic compound binding DNA end binding nucleic acid binding protein binding DNA polymerase binding enzyme binding	response to ionizing radiation response to stimulus response to radiation response to abiotic stimulus developmental process multicellular organismal process cellular developmental process hemopoiesis B cell activation cell activation cell development mononuclear cell differentiation lymphocyte differentiation lymphocyte activation response to ionizing radiation response to stimulus response to radiation response to abiotic stimulus developmental process multicellular organismal process cellular developmental process hemopoiesis B cell activation cell activation cell development mononuclear cell differentiation lymphocyte differentiation lymphocyte activation leukocyte activation B cell differentiation cell differentiation immune system process anatomical structure development cellular process leukocyte differentiation multicellular organism development central nervous system development nervous system development system development positive regulation of molecular function regulation of molecular function regulation of ligase activity regulation of catalytic activity biological regulation positive regulation of catalytic activity positive regulation of ligase activity cellular response to stimulus DNA ligation involved in DNA repair primary metabolic process DNA metabolic process nucleic acid metabolic process DNA ligation nucleobase-containing compound metabolic process organic cyclic compound metabolic process organic substance metabolic process cellular response to stress DNA damage response response to stress metabolic process macromolecule metabolic process DNA repair immune system development immunoglobulin production cellular biosynthetic process somatic cell DNA recombination V(D)J recombination somatic recombination of immunoglobulin gene segments organic substance biosynthetic process somatic diversification of immune receptors production of molecular mediator of immune response DNA recombination cellular metabolic process gene expression macromolecule biosynthetic process somatic diversification of immunoglobulins immunoglobulin V(D)J recombination biosynthetic process somatic diversification of immune receptors via germline recombination within a single locus T cell activation T cell differentiation double-strand break repair double-strand break repair via nonhomologous end joining	protein-containing complex nonhomologous end joining complex catalytic complex intracellular protein-containing complex DNA repair complex membrane-bounded organelle intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle organelle DNA-dependent protein kinase-DNA ligase 4 complex protein-containing complex nonhomologous end joining complex catalytic complex intracellular protein-containing complex DNA repair complex membrane-bounded organelle intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle organelle DNA-dependent protein kinase-DNA ligase 4 complex membrane-enclosed lumen nucleolus intracellular organelle lumen organelle lumen fibrillar center intracellular non-membrane-bounded organelle nuclear lumen non-membrane-bounded organelle DNA ligase IV complex site of double-strand break site of DNA damage chromosome nucleoplasm
C, D	DNA repair protein XRCC4	protein binding binding FHA domain binding protein domain specific binding identical protein binding	cellular response to stimulus cellular response to inorganic substance cellular response to metal ion cellular response to lithium ion response to stimulus response to inorganic substance cellular response to chemical stimulus response to lithium ion response to metal ion response to chemical cellular process positive regulation of molecular function regulation of molecular function regulation of ligase activity cellular response to stimulus cellular response to inorganic substance cellular response to metal ion cellular response to lithium ion response to stimulus response to inorganic substance cellular response to chemical stimulus response to lithium ion response to metal ion response to chemical cellular process positive regulation of molecular function regulation of molecular function regulation of ligase activity regulation of catalytic activity biological regulation positive regulation of catalytic activity positive regulation of ligase activity response to X-ray response to ionizing radiation response to radiation response to abiotic stimulus DNA ligation involved in DNA repair primary metabolic process DNA metabolic process nucleic acid metabolic process DNA ligation nucleobase-containing compound metabolic process organic cyclic compound metabolic process organic substance metabolic process cellular response to stress DNA damage response response to stress metabolic process macromolecule metabolic process DNA repair protein localization localization cellular localization protein localization to chromosome protein localization to organelle cellular macromolecule localization macromolecule localization protein localization to site of double-strand break double-strand break repair immune system development multicellular organismal process immunoglobulin production cellular biosynthetic process somatic cell DNA recombination multicellular organism development V(D)J recombination somatic recombination of immunoglobulin gene segments anatomical structure development organic substance biosynthetic process somatic diversification of immune receptors system development developmental process production of molecular mediator of immune response DNA recombination cellular metabolic process gene expression macromolecule biosynthetic process somatic diversification of immunoglobulins immunoglobulin V(D)J recombination biosynthetic process immune system process somatic diversification of immune receptors via germline recombination within a single locus double-strand break repair via nonhomologous end joining	protein-containing complex nonhomologous end joining complex catalytic complex intracellular protein-containing complex DNA repair complex membrane-bounded organelle intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle organelle DNA-dependent protein kinase-DNA ligase 4 complex protein-containing complex nonhomologous end joining complex catalytic complex intracellular protein-containing complex DNA repair complex membrane-bounded organelle intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle organelle DNA-dependent protein kinase-DNA ligase 4 complex cytoplasm cytosol DNA ligase IV complex site of double-strand break intracellular non-membrane-bounded organelle site of DNA damage chromosome non-membrane-bounded organelle membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR015381	XLF, N-terminal	Domain
A, B	IPR038051	XRCC4-like, N-terminal domain superfamily	Homologous Superfamily
C, D	IPR014751	DNA repair protein XRCC4-like, C-terminal	Homologous Superfamily
C, D	IPR010585	DNA repair protein XRCC4	Family
C, D	IPR038051	XRCC4-like, N-terminal domain superfamily	Homologous Superfamily
C, D	IPR009089	XRCC4, N-terminal domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: Q9H9Q4	Cernunnos-XLF deficiency microcephaly DNA ligase IV deficiency Primary microcephaly intellectual disability
C, D	Pharos: Q13426	short stature, microcephaly, and endocrine dysfunction DNA ligase IV deficiency Chromosome Aberrations pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia schizophrenia astrocytic tumor congestive heart failure isolated growth hormone deficiency type IA malignant mesothelioma microcephalic primordial dwarfism-insulin resistance syndrome pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma primitive neuroectodermal tumor malignant colon neoplasm malignant pancreatic neoplasm short stature, microcephaly, and endocrine dysfunction DNA ligase IV deficiency Chromosome Aberrations pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia schizophrenia astrocytic tumor congestive heart failure isolated growth hormone deficiency type IA malignant mesothelioma microcephalic primordial dwarfism-insulin resistance syndrome pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma primitive neuroectodermal tumor malignant colon neoplasm malignant pancreatic neoplasm oligodendroglioma pancreatic intraductal papillary-mucinous neoplasm pituitary cancer psoriasis tuberculosis intellectual disability malignant ependymoma medulloblastoma osteosarcoma

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.