Annotations: 3K10

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Stn1_C	e3k10A1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Stn1_C	ECOD (1.6)
A	Stn1_C_like	e3k10A2	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Stn1_C_like	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.10.1080	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Stn1, N-terminal wHTH domain	CATH (4.3.0)
A	3.30.1370.230	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S8	Chain: A, domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF12659	Telomere capping C-terminal wHTH (Stn1_C)	Telomere capping C-terminal wHTH	This domain consists of tandem winged helix-turn-helix motifs. Stn1 and Ten1 are DNA-binding proteins with specificity for telomeric DNA substrates and both protect chromosome termini from unregulated resection and regulate telomere length. Stn1 comp ...	This domain consists of tandem winged helix-turn-helix motifs. Stn1 and Ten1 are DNA-binding proteins with specificity for telomeric DNA substrates and both protect chromosome termini from unregulated resection and regulate telomere length. Stn1 complexes with Ten1 and Cdc13 to function as a telomere-specific replication protein A (RPA)-like complex [1-4]. These three interacting proteins associate with the telomeric overhang in budding yeast, whereas a single protein known as Pot1 (protection of telomeres-1) performs this function in fission yeast, and a two-subunit complex consisting of POT1 and TPP1 associates with telomeric ssDNA in humans. S.pombe has Stn1- and Ten1-like proteins that are essential for chromosome end protection. Stn1 orthologues exist in all species that have Pot1, whereas Ten1-like proteins can be found in all fungi. Fission yeast Stn1 and Ten1 localise at telomeres in a manner that correlates with the length of the ssDNA overhang, suggesting that they specifically associate with the telomeric ssDNA. Two separate protein complexes are required for chromosome end protection in fission yeast. Protection of telomeres by multiple proteins with OB-fold domains is conserved in eukaryotic evolution [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Protein STN1	sequence-specific DNA binding DNA binding binding sequence-specific single stranded DNA binding single-stranded telomeric DNA binding single-stranded DNA binding nucleic acid binding telomeric DNA binding protein binding translation elongation factor 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 organelle organization telomere capping cellular process metabolic process cellular component organization or biogenesis macromolecule 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 organelle organization telomere capping cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process regulation of telomere maintenance regulation of cellular component organization regulation of cellular process regulation of DNA biosynthetic process regulation of primary metabolic process RNA-templated DNA biosynthetic process telomere maintenance via telomere lengthening nucleic acid biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of biosynthetic process regulation of biological process telomere maintenance via telomerase biological regulation regulation of chromosome organization regulation of macromolecule metabolic process regulation of telomere maintenance via telomere lengthening nucleobase-containing compound biosynthetic process macromolecule biosynthetic process regulation of organelle organization regulation of telomere maintenance via telomerase biosynthetic process regulation of macromolecule biosynthetic process regulation of metabolic process DNA biosynthetic process regulation of DNA metabolic process negative regulation of telomere maintenance negative regulation of biological process negative regulation of telomere maintenance via telomerase negative regulation of chromosome organization negative regulation of nucleobase-containing compound metabolic process negative regulation of cellular component organization negative regulation of metabolic process negative regulation of macromolecule biosynthetic process negative regulation of DNA biosynthetic process negative regulation of telomere maintenance via telomere lengthening negative regulation of cellular process negative regulation of macromolecule metabolic 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 intracellular membraneless organelle nuclear protein-containing complex chromosome intracellular membrane-bounded organelle chromosomal region intracellular organelle cellular anatomical structure organelle telomere cap complex membrane-bounded organelle protein-containing complex intracellular anatomical structure protein-DNA complex nucleus intracellular membraneless organelle nuclear protein-containing complex chromosome intracellular membrane-bounded organelle chromosomal region intracellular organelle cellular anatomical structure organelle telomere cap complex membraneless organelle chromosome, telomeric repeat region CST complex chromosome, telomeric region nuclear telomere cap complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR024263	Stn1, C-terminal, fungi	Domain
A	IPR018856	CST complex subunit Stn1, N-terminal	Domain
A	IPR038240	Stn1, C-terminal domain superfamily	Homologous Superfamily

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.