Annotations: 4O26

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	TERT TR-binding domain-like	8052454	3002119	SCOP2B (2022-06-29)
B	SCOP2 Family	Telomerase RBD-like	8047108	4005451	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	TERT TR-binding domain-like	8052454	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	PF12009	e4o26A1	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: PF12009	ECOD (1.6)
B	PF12009	e4o26B1	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: PF12009	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	telomerase activity RNA-directed DNA polymerase activity catalytic activity, acting on DNA DNA polymerase activity catalytic activity, acting on a nucleic acid transferase activity telomerase RNA reverse transcriptase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups RNA binding binding telomerase RNA binding organic cyclic compound binding telomerase activity RNA-directed DNA polymerase activity catalytic activity, acting on DNA DNA polymerase activity catalytic activity, acting on a nucleic acid transferase activity telomerase RNA reverse transcriptase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups 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	nucleobase-containing compound metabolic process organic cyclic compound metabolic process DNA strand elongation organic substance metabolic process metabolic process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process cellular biosynthetic process telomere organization RNA-templated DNA biosynthetic process telomere maintenance via telomere lengthening cellular component organization nucleobase-containing compound metabolic process organic cyclic compound metabolic process DNA strand elongation organic substance metabolic process metabolic process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process cellular biosynthetic process telomere organization RNA-templated DNA biosynthetic process telomere maintenance via telomere lengthening cellular component organization nucleic acid biosynthetic process organic substance biosynthetic process cellular component organization or biogenesis telomere maintenance via telomerase cellular metabolic process chromosome organization nucleobase-containing compound biosynthetic process macromolecule biosynthetic process telomere maintenance organelle organization biosynthetic process organic cyclic compound biosynthetic process cellular process DNA biosynthetic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex transferase complex intracellular membrane-bounded organelle cellular anatomical entity telomerase catalytic core complex transferase complex, transferring phosphorus-containing groups intracellular organelle telomerase holoenzyme complex organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex transferase complex intracellular membrane-bounded organelle cellular anatomical entity telomerase catalytic core complex transferase complex, transferring phosphorus-containing groups intracellular organelle telomerase holoenzyme complex organelle ribonucleoprotein complex intracellular non-membrane-bounded organelle chromosome chromosome, telomeric region chromosomal region non-membrane-bounded organelle
C [auth E], D [auth F]	Telomerase TR	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR021891	Telomerase ribonucleoprotein complex - RNA-binding domain	Domain
A, B	IPR049139	Telomerase reverse transcriptase, C-terminal extension	Domain
A, B	IPR043502	DNA/RNA polymerase superfamily	Homologous Superfamily
A, B	IPR000477	Reverse transcriptase domain	Domain
A, B	IPR003545	Telomerase reverse transcriptase	Family

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.