2B2A

Crystal Structure of the TEN domain of the Telomerase Reverse Transcriptase

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Identifier	Description	Comments	Source
A, B, C	PF00078	Reverse transcriptase (RNA-dependent DNA polymerase) (RVT_1)	Reverse transcriptase (RNA-dependent DNA polymerase)	-	Family
A, B, C	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 Product Annotation Gene Product Annotation

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C	Telomerase reverse transcriptase	binding ion binding cation binding metal ion binding nucleic acid binding RNA binding telomerase RNA binding organic cyclic compound binding heterocyclic compound binding telomerase activity telomerase RNA reverse transcriptase activity catalytic activity RNA-directed DNA polymerase activity transferase activity transferase activity, transferring phosphorus-containing groups nucleotidyltransferase activity DNA polymerase activity catalytic activity, acting on DNA DNA binding telomeric DNA binding sequence-specific DNA binding		intracellular anatomical structure nucleus telomerase holoenzyme complex protein-containing complex organelle membrane-bounded organelle intracellular organelle intracellular membrane-bounded organelle cellular anatomical entity nuclear protein-containing complex ribonucleoprotein complex

RCSB PDB is 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.