6Q44 | pdb_00006q44

Est3 telomerase subunit in the yeast Hansenula polymorpha

External Resource: Annotation

Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	TPP1	e6q44A1	A: beta barrels	X: OB-fold	H: Nucleic acid-binding proteins (From Topology)	T: Nucleic acid-binding proteins	F: TPP1	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF10341	Shelterin complex subunit, TPP1/ACD (TPP1)	Shelterin complex subunit, TPP1/ACD	TPP1 is a component of the telomerase holoenzyme, involved in telomere replication. It has been demonstrated that TPP1 dimerises and binds to DNA and RNA. Furthermore, TPP1 stimulates the dissociation of RNA/DNA hetero-duplexes [1,2]. Yeast telomera ...	TPP1 is a component of the telomerase holoenzyme, involved in telomere replication. It has been demonstrated that TPP1 dimerises and binds to DNA and RNA. Furthermore, TPP1 stimulates the dissociation of RNA/DNA hetero-duplexes [1,2]. Yeast telomerase protein TPP1 (Est3 in yeast) is a novel type of GTPase [3]. The key residues in Swiss:Q03096 are an Asp at residue 86 and the Arg at residue 110. The Asp is totally conserved in the family, whereas the Arg is not so well conserved. The N-terminal of TPP1 is likely to be the binding surface for TINF2, whereas the C-terminus probably binds to POT1, thereby tethering POT1 to the shelterin complex [4]. The complex bound to telomeric DNA increases the activity and processivity of the human telomerase core enzyme, thus helping to maintain the length of the telomeres [5,6]. This domain is conserved from fungi to mammals, hence family Telomere_Pot1 has been merged into the family [7]. The human shelterin complex includes six proteins: telomere repeat binding factor 1 (TRF1), TRF2, repressor/activator protein 1 (RAP1), TRF1-interacting nuclear protein 2 (TIN2), TIN2-interacting protein 1 (TPP1) and protection of telomeres 1 (POT1) [8].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Uncharacterized protein	sequence-specific DNA binding DNA binding binding nucleic acid binding telomeric DNA binding	telomere maintenance via telomerase telomere organization chromosome organization primary metabolic process DNA metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process RNA-templated DNA biosynthetic process nucleobase-containing compound metabolic process telomere maintenance via telomere lengthening telomere maintenance cellular component organization nucleic acid biosynthetic process organelle organization telomere maintenance via telomerase telomere organization chromosome organization primary metabolic process DNA metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process RNA-templated DNA biosynthetic process nucleobase-containing compound metabolic process telomere maintenance via telomere lengthening telomere maintenance cellular component organization nucleic acid biosynthetic process organelle organization biosynthetic process metabolic process cellular process macromolecule metabolic process cellular component organization or biogenesis DNA biosynthetic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex intracellular membrane-bounded organelle intracellular organelle telomerase holoenzyme complex cellular anatomical structure organelle ribonucleoprotein complex membraneless organelle intracellular membraneless organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex intracellular membrane-bounded organelle intracellular organelle telomerase holoenzyme complex cellular anatomical structure organelle ribonucleoprotein complex membraneless organelle intracellular membraneless organelle chromosome chromosome, telomeric region chromosomal region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR019437	Shelterin complex subunit TPP1/Est3	Domain

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.