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	XRCC4_1st	e3w03C3	A: beta barrels	X: XRCC4, N-terminal domain-like	H: XRCC4, N-terminal domain (From Topology)	T: XRCC4, N-terminal domain	F: XRCC4_1st	ECOD (1.6)
C	XRCC4_2nd	e3w03C2	A: alpha arrays	X: HTH	H: HTH	T: HTH motif inserted in other structures	F: XRCC4_2nd	ECOD (1.6)
C	XRCC4_3rd_1	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: XRCC4_3rd_1	ECOD (1.6)
D	XRCC4_1st	e3w03D1	A: beta barrels	X: XRCC4, N-terminal domain-like	H: XRCC4, N-terminal domain (From Topology)	T: XRCC4, N-terminal domain	F: XRCC4_1st	ECOD (1.6)
D	XRCC4_2nd	e3w03D3	A: alpha arrays	X: HTH	H: HTH	T: HTH motif inserted in other structures	F: XRCC4_2nd	ECOD (1.6)
D	XRCC4_3rd_1	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: XRCC4_3rd_1	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF09302	XLF N-terminal domain (XLF)	XLF N-terminal domain	XLF (also called Cernunnos) is Xrcc4-like-factor, and interacts with the XRCC4-DNA ligase IV complex to promote DNA non-homologous end-joining. It directly interacts with the XRCC4-Ligase IV complex and siRNA-mediated down-regulation of XLF in human ...	XLF (also called Cernunnos) is Xrcc4-like-factor, and interacts with the XRCC4-DNA ligase IV complex to promote DNA non-homologous end-joining. It directly interacts with the XRCC4-Ligase IV complex and siRNA-mediated down-regulation of XLF in human cell lines leads to radio-sensitivity and impaired DNA non-homologous end-joining [1]. This family contains Nej1 (non-homologous end-joining factor) [2], and Lif1, ligase-interacting factor [3]. XLF forms one of the components of the NHEJ machinery for DNA non-homologous end-joining [4]. This entry represents the N-terminal beta sandwich domain of XLF.	Domain
A, B	PF21928	XLF protein coiled-coil region (XLF_CC)	XLF protein coiled-coil region	-	Coiled-coil
C, D	PF06632	XRCC4 N-terminal domain (XRCC4)	XRCC4 N-terminal domain	This family consists of several eukaryotic DNA double-strand break repair and V(D)J recombination protein XRCC4 sequences. In the non-homologous end joining pathway of DNA double-strand break repair, the ligation step is catalysed by a complex of XRC ...	This family consists of several eukaryotic DNA double-strand break repair and V(D)J recombination protein XRCC4 sequences. In the non-homologous end joining pathway of DNA double-strand break repair, the ligation step is catalysed by a complex of XRCC4 and DNA ligase IV. It is thought that XRCC4 and ligase IV are essential for alignment-based gap filling, as well as for final ligation of the breaks [1]. This entry represents the N-terminal beta sandwich domain.	Domain
C, D	PF21924	XRCC4 coiled-coil (XRCC4_CC)	XRCC4 coiled-coil	-	Coiled-coil

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 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 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 metal ion cellular response to chemical stimulus response to lithium ion cellular response to lithium ion response to stimulus 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 cellular response to stimulus cellular response to metal ion cellular response to chemical stimulus response to lithium ion cellular response to lithium ion response to stimulus 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 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 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	IPR052287	Non-homologous end-joining factor	Family
A, B	IPR015381	XLF-like, N-terminal	Domain
A, B	IPR038051	XRCC4-like, N-terminal domain superfamily	Homologous Superfamily
A, B	IPR053829	XLF-like, coiled-coil region	Domain
C, D	IPR053963	XRCC4, C-terminal domain	Domain
C, D	IPR014751	DNA repair protein XRCC4-like, C-terminal	Homologous Superfamily
C, D	IPR053961	XRCC4, N-terminal domain	Domain
C, D	IPR010585	DNA repair protein XRCC4	Family
C, D	IPR038051	XRCC4-like, N-terminal domain superfamily	Homologous Superfamily
C, D	IPR053962	XRCC4, coiled-coil domain	Domain
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 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.