Annotations: 6W6W

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth C]	Stn1_1	e6w6wC1	A: beta barrels	X: OB-fold	H: Nucleic acid-binding proteins (From Topology)	T: Nucleic acid-binding proteins	F: Stn1_1	ECOD (1.6)
D [auth C]	STN1_2	e6w6wC2	A: alpha arrays	X: HTH	H: HTH	T: winged	F: STN1_2	ECOD (1.6)
E [auth D]	Ten1_2	e6w6wD1	A: beta barrels	X: OB-fold	H: Nucleic acid-binding proteins (From Topology)	T: Nucleic acid-binding proteins	F: Ten1_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
E [auth D]	2.40.50.140	Mainly Beta	Beta Barrel	OB fold (Dihydrolipoamide Acetyltransferase, E2P)	Nucleic acid-binding proteins	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C [auth B]	PF15489	CST, telomere maintenance, complex subunit CTC1 (CTC1)	CST, telomere maintenance, complex subunit CTC1	-	Family
D [auth C]	PF01336	OB-fold nucleic acid binding domain (tRNA_anti-codon)	OB-fold nucleic acid binding domain	This family contains OB-fold domains that bind to nucleic acids [4]. The family includes the anti-codon binding domain of lysyl, aspartyl, and asparaginyl -tRNA synthetases (See Pfam:PF00152). Aminoacyl-tRNA synthetases catalyse the addition of an a ...	This family contains OB-fold domains that bind to nucleic acids [4]. The family includes the anti-codon binding domain of lysyl, aspartyl, and asparaginyl -tRNA synthetases (See Pfam:PF00152). Aminoacyl-tRNA synthetases catalyse the addition of an amino acid to the appropriate tRNA molecule EC:6.1.1.-. This family also includes part of RecG helicase involved in DNA repair. Replication factor A is a hetero-trimeric complex, that contains a subunit in this family [2,3]. This domain is also found at the C-terminus of bacterial DNA polymerase III alpha chain.	Domain
D [auth C]	PF09170	CST, complex subunit STN1, C terminal (STN1_2)	CST, complex subunit STN1, C terminal	STN1 is a component of the CST complex, a complex that binds to single-stranded DNA and is required for protecting telomeres from DNA degradation. The CST complex binds single-stranded DNA with high affinity in a sequence-independent manner, while is ...	STN1 is a component of the CST complex, a complex that binds to single-stranded DNA and is required for protecting telomeres from DNA degradation. The CST complex binds single-stranded DNA with high affinity in a sequence-independent manner, while isolated subunits bind DNA with low affinity on their own. In addition to telomere protection, the CST complex probably has a more general role in DNA metabolism at non-telomeric sites. This entry represents the C-terminal region of Stn1 which has two winged helix-turn-helix (wHTH) motifs, wHTH1 and wHTH2 [2,4]. wHTH1 is structurally similar to that in RPA32 with a large insertion between helices alpha2 and alpha3, unique to Stn1, that may allow interaction with a different set of proteins that function at telomeres such as Ctc1 [4]. wHTH2 is most similar to the DNA-binding wHTH motifs of the pur operon repressor and RepE replication initiator, but it does not bind double-stranded DNA [5].	Domain
E [auth D]	PF15490	Telomere-capping, CST complex subunit (Ten1_2)	Telomere-capping, CST complex subunit	Ten1_2 is a family of primarily plant and vertebrate telomere-capping proteins that is evolutionarily related to the mostly fungal family of Ten1, Pfam:PF12658.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C [auth B]	CST complex subunit CTC1	sequence-specific DNA binding DNA binding G-rich strand telomeric DNA binding binding organic cyclic compound binding sequence-specific single stranded DNA binding single-stranded telomeric DNA binding single-stranded DNA binding nucleic acid binding telomeric DNA binding	cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process developmental process stem cell proliferation cell population proliferation cellular developmental process hemopoiesis cell differentiation anatomical structure development hematopoietic stem cell proliferation cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process developmental process stem cell proliferation cell population proliferation cellular developmental process hemopoiesis cell differentiation anatomical structure development hematopoietic stem cell proliferation cell development immune system development multicellular organism development multicellular organismal process spleen development immune system process animal organ development hematopoietic or lymphoid organ development system development tissue development bone marrow development skeletal system development bone development gland development thymus development cell cycle G2/M phase transition regulation of biological process regulation of cell cycle phase transition regulation of cellular process regulation of G2/M transition of mitotic cell cycle regulation of cell cycle process G2/M transition of mitotic cell cycle biological regulation regulation of cell cycle G2/M phase transition cell cycle phase transition mitotic cell cycle regulation of mitotic cell cycle phase transition regulation of mitotic cell cycle mitotic cell cycle process cell cycle regulation of cell cycle cell cycle process mitotic cell cycle phase transition fibroblast proliferation positive regulation of cell population proliferation positive regulation of biological process regulation of fibroblast proliferation regulation of cell population proliferation positive regulation of fibroblast proliferation positive regulation of cellular process replicative senescence cellular metabolic process metabolic process positive regulation of DNA replication regulation of primary metabolic process nucleobase-containing compound metabolic process positive regulation of metabolic process organic substance metabolic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of nucleobase-containing compound metabolic process primary metabolic process DNA metabolic process regulation of macromolecule metabolic process nucleic acid metabolic process organic cyclic compound metabolic process DNA replication positive regulation of DNA metabolic process macromolecule metabolic process regulation of metabolic process regulation of DNA metabolic process regulation of DNA replication telomere organization chromosome organization telomere maintenance cellular component organization organelle organization telomere capping cellular component organization or biogenesis multicellular organism growth developmental growth growth telomere maintenance via telomere lengthening negative regulation of telomere maintenance negative regulation of biological process negative regulation of telomere maintenance via telomerase regulation of DNA biosynthetic process negative regulation of cellular metabolic process RNA-templated DNA biosynthetic process negative regulation of chromosome organization organic substance biosynthetic process negative regulation of nucleobase-containing compound metabolic process negative regulation of cellular component organization negative regulation of metabolic process regulation of cellular metabolic process regulation of chromosome organization regulation of telomere maintenance via telomere lengthening regulation of organelle organization negative regulation of cellular biosynthetic process biosynthetic process negative regulation of macromolecule biosynthetic process organic cyclic compound biosynthetic process regulation of macromolecule biosynthetic process DNA biosynthetic process negative regulation of DNA biosynthetic process regulation of telomere maintenance regulation of cellular component organization negative regulation of telomere maintenance via telomere lengthening cellular biosynthetic process nucleic acid biosynthetic process negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process telomere maintenance via telomerase nucleobase-containing compound biosynthetic process macromolecule biosynthetic process regulation of telomere maintenance via telomerase regulation of cellular biosynthetic process negative regulation of organelle organization negative regulation of biosynthetic process negative regulation of DNA metabolic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus nuclear protein-containing complex chromosome cellular anatomical entity intracellular membrane-bounded organelle chromosomal region intracellular organelle organelle telomere cap complex intracellular non-membrane-bounded organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus nuclear protein-containing complex chromosome cellular anatomical entity intracellular membrane-bounded organelle chromosomal region intracellular organelle organelle telomere cap complex intracellular non-membrane-bounded organelle chromosome, telomeric repeat region CST complex chromosome, telomeric region non-membrane-bounded organelle nuclear telomere cap complex cytoplasm cytosol membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen
B [auth E]	DNA (5'-D(PTPAPGPG)-3')	-	-	-
D [auth C]	CST complex subunit STN1	sequence-specific DNA binding DNA binding binding organic cyclic compound binding sequence-specific single stranded DNA binding single-stranded telomeric DNA binding single-stranded DNA binding nucleic acid binding telomeric DNA binding	positive regulation of DNA replication positive regulation of biological process regulation of primary metabolic process nucleobase-containing compound metabolic process positive regulation of metabolic process organic substance metabolic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of nucleobase-containing compound metabolic process regulation of biological process biological regulation primary metabolic process DNA metabolic process regulation of macromolecule metabolic process positive regulation of DNA replication positive regulation of biological process regulation of primary metabolic process nucleobase-containing compound metabolic process positive regulation of metabolic process organic substance metabolic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of nucleobase-containing compound metabolic process regulation of biological process biological regulation primary metabolic process DNA metabolic process regulation of macromolecule metabolic process nucleic acid metabolic process organic cyclic compound metabolic process DNA replication positive regulation of DNA metabolic process metabolic process macromolecule metabolic process regulation of metabolic process regulation of DNA metabolic process regulation of DNA replication telomere organization chromosome organization telomere maintenance cellular component organization organelle organization telomere capping cellular process cellular component organization or biogenesis telomere maintenance via telomere lengthening negative regulation of telomere maintenance regulation of cellular process negative regulation of biological process negative regulation of telomere maintenance via telomerase regulation of DNA biosynthetic process negative regulation of cellular metabolic process RNA-templated DNA biosynthetic process negative regulation of chromosome organization organic substance biosynthetic process negative regulation of nucleobase-containing compound metabolic process negative regulation of cellular component organization negative regulation of metabolic process cellular metabolic process regulation of cellular metabolic process regulation of chromosome organization regulation of telomere maintenance via telomere lengthening regulation of organelle organization negative regulation of cellular biosynthetic process biosynthetic process negative regulation of macromolecule biosynthetic process organic cyclic compound biosynthetic process regulation of macromolecule biosynthetic process DNA biosynthetic process negative regulation of DNA biosynthetic process regulation of telomere maintenance regulation of cellular component organization negative regulation of telomere maintenance via telomere lengthening cellular biosynthetic process nucleic acid biosynthetic process negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process telomere maintenance via telomerase nucleobase-containing compound biosynthetic process macromolecule biosynthetic process regulation of telomere maintenance via telomerase regulation of cellular biosynthetic process negative regulation of organelle organization negative regulation of biosynthetic process negative regulation of DNA metabolic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus nuclear protein-containing complex chromosome cellular anatomical entity intracellular membrane-bounded organelle chromosomal region intracellular organelle organelle telomere cap complex intracellular non-membrane-bounded organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus nuclear protein-containing complex chromosome cellular anatomical entity intracellular membrane-bounded organelle chromosomal region intracellular organelle organelle telomere cap complex intracellular non-membrane-bounded organelle chromosome, telomeric repeat region CST complex chromosome, telomeric region non-membrane-bounded organelle nuclear telomere cap complex membrane-enclosed lumen nucleolus intracellular organelle lumen organelle lumen fibrillar center nuclear lumen cytoskeleton intermediate filament cytoskeleton nucleoplasm
E [auth D]	CST complex subunit TEN1	enzyme regulator activity molecular function inhibitor activity molecular function regulator activity enzyme inhibitor activity telomerase inhibitor activity sequence-specific DNA binding DNA binding binding organic cyclic compound binding nucleic acid binding telomeric DNA binding single-stranded DNA binding	telomere organization chromosome organization primary metabolic process DNA metabolic process nucleic acid metabolic process telomere maintenance cellular component organization nucleobase-containing compound metabolic process organic cyclic compound metabolic process organelle organization organic substance metabolic process telomere capping cellular process metabolic process telomere organization chromosome organization primary metabolic process DNA metabolic process nucleic acid metabolic process telomere maintenance cellular component organization nucleobase-containing compound metabolic process organic cyclic compound metabolic process organelle organization organic substance metabolic process telomere capping cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process negative regulation of telomere maintenance regulation of cellular process negative regulation of biological process negative regulation of telomere maintenance via telomerase regulation of DNA biosynthetic process negative regulation of cellular metabolic process regulation of primary metabolic process RNA-templated DNA biosynthetic process telomere maintenance via telomere lengthening negative regulation of chromosome organization organic substance biosynthetic process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of biological process negative regulation of cellular component organization negative regulation of metabolic process cellular metabolic process regulation of cellular metabolic process regulation of chromosome organization regulation of telomere maintenance via telomere lengthening regulation of organelle organization negative regulation of cellular biosynthetic process biosynthetic process negative regulation of macromolecule biosynthetic process organic cyclic compound biosynthetic process regulation of macromolecule biosynthetic process regulation of metabolic process DNA biosynthetic process negative regulation of DNA biosynthetic process regulation of DNA metabolic process regulation of telomere maintenance regulation of cellular component organization negative regulation of telomere maintenance via telomere lengthening cellular biosynthetic process nucleic acid biosynthetic process negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process telomere maintenance via telomerase biological regulation regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process regulation of telomere maintenance via telomerase regulation of cellular biosynthetic process negative regulation of organelle organization negative regulation of biosynthetic process negative regulation of DNA metabolic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus nuclear protein-containing complex chromosome cellular anatomical entity intracellular membrane-bounded organelle chromosomal region intracellular organelle organelle telomere cap complex intracellular non-membrane-bounded organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus nuclear protein-containing complex chromosome cellular anatomical entity intracellular membrane-bounded organelle chromosomal region intracellular organelle organelle telomere cap complex intracellular non-membrane-bounded organelle chromosome, telomeric repeat region CST complex chromosome, telomeric region non-membrane-bounded organelle nuclear telomere cap complex membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C [auth B]	IPR042617	CST complex subunit CTC1-like	Family
A, C [auth B]	IPR029156	CST complex subunit CTC1	Family
D [auth C]	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
D [auth C]	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
D [auth C]	IPR042082	CST complex subunit Stn1, wHTH1 motif superfamily	Homologous Superfamily
D [auth C]	IPR040260	Replication factor A protein-like	Family
D [auth C]	IPR004365	OB-fold nucleic acid binding domain, AA-tRNA synthetase-type	Domain
D [auth C]	IPR012340	Nucleic acid-binding, OB-fold	Homologous Superfamily
D [auth C]	IPR014647	CST complex subunit Stn1	Family
D [auth C]	IPR015253	Stn1, C-terminal	Domain
E [auth D]	IPR029146	CST complex subunit Ten1, animal and plant type	Family
E [auth D]	IPR012340	Nucleic acid-binding, OB-fold	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, C [auth B]	Pharos: Q2NKJ3	dyskeratosis congenita Coats disease gastric antral vascular ectasia brain disease cerebroretinal microangiopathy with calcifications and cysts 1 calcinosis Bone Diseases, Metabolic Coats plus syndrome hematopoietic and lymphoid system neoplasm osteosarcoma congenital anemia endogenous depression intellectual disability medulloblastoma
D [auth C]	Pharos: Q9H668	idiopathic pulmonary fibrosis cerebroretinal microangiopathy with calcifications and cysts 2 melanoma osteosarcoma renal cell carcinoma tuberculosis astrocytic tumor CEREBRORETINAL MICROANGIOPATHY WITH CALCIFICATIONS AND CYSTS (disorder) Coats plus syndrome esophageal adenocarcinoma hematopoietic and lymphoid system neoplasm interstitial lung disease neuroblastoma ovarian cancer skin basal cell carcinoma idiopathic pulmonary fibrosis cerebroretinal microangiopathy with calcifications and cysts 2 melanoma osteosarcoma renal cell carcinoma tuberculosis astrocytic tumor CEREBRORETINAL MICROANGIOPATHY WITH CALCIFICATIONS AND CYSTS (disorder) Coats plus syndrome esophageal adenocarcinoma hematopoietic and lymphoid system neoplasm interstitial lung disease neuroblastoma ovarian cancer skin basal cell carcinoma uterine corpus leiomyoma brain glioma cutaneous melanoma hypertensive disorder lung adenocarcinoma oligodendroglioma ovarian carcinoma thyroid gland carcinoma chronic obstructive pulmonary disease heart disease lung benign neoplasm

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.