5C9H

Structural Basis of Template Boundary Definition in Tetrahymena Telomerase

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Telomerase RBD-like	8047110	4005451	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	TERT TR-binding domain-like	8052457	3002119	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Telomerase_RBD	e5c9hA1	A: alpha arrays	X: RNA-binding domain of telomerase (From Topology)	H: RNA-binding domain of telomerase (From Topology)	T: RNA-binding domain of telomerase	F: Telomerase_RBD	ECOD (1.6)
B	Telomerase_RBD	e5c9hB1	A: alpha arrays	X: RNA-binding domain of telomerase (From Topology)	H: RNA-binding domain of telomerase (From Topology)	T: RNA-binding domain of telomerase	F: Telomerase_RBD	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.132.70	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	Chain A, domain 4	CATH (4.3.0)
B	1.10.132.70	Mainly Alpha	Orthogonal Bundle	Topoisomerase I	Chain A, domain 4	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF12009	Telomerase ribonucleoprotein complex - RNA binding domain (Telomerase_RBD)	Telomerase ribonucleoprotein complex - RNA binding domain	Telomeres in most organisms are comprised of tandem simple sequence repeats [1]. The total length of telomeric repeat sequence at each chromosome end is determined in a balance of sequence loss and sequence addition [1]. One major influence on telome ...	Telomeres in most organisms are comprised of tandem simple sequence repeats [1]. The total length of telomeric repeat sequence at each chromosome end is determined in a balance of sequence loss and sequence addition [1]. One major influence on telomere length is the enzyme telomerase [1]. It is a reverse transcriptase that adds these simple sequence repeats to chromosome ends by copying a template sequence within the RNA component of the enzyme [1]. The RNA binding domain of telomerase - TRBD - is made up of twelve alpha helices and two short beta sheets [2]. How telomerase and associated regulatory factors physically interact and function with each other to maintain appropriate telomere length is poorly understood. It is known however that TRBD is involved in formation of the holoenzyme (which performs the telomere extension) in addition to recognition and binding of RNA [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Telomerase reverse transcriptase	RNA binding binding telomerase RNA binding organic cyclic compound binding nucleic acid binding sequence-specific DNA binding DNA binding telomeric DNA binding cation binding ion binding metal ion binding small molecule 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
C [auth D], E	RNA (5'-R(PAPGPAPAPCPUPGPUPCPA)-3')	-	-	-
D [auth C], F [auth G]	RNA (5'-R(PUPCPAPUPUPCPAPGPUPUPCPU)-3')	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR000477	Reverse transcriptase domain	Domain
A, B	IPR021891	Telomerase ribonucleoprotein complex - RNA-binding domain	Domain
A, B	IPR003545	Telomerase reverse transcriptase	Family
A, B	IPR049915	Telomerase reverse transcriptase, TEN domain	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.