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7LMB

Tetrahymena telomerase T5D5 structure at 3.8 Angstrom

Summary for 7LMB
Entry DOI10.2210/pdb7lmb/pdb
Related7LMA
EMDB information23437 23438 23439
DescriptorTelomerase RNA, telomere DNA, Telomerase La-related protein p65, ... (9 entities in total)
Functional Keywordstelomerase, polymerase, reverse transcriptase, ribonucleoprotein, replication, replication-rna-dna complex, replication/rna/dna
Biological sourceTetrahymena thermophila
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Total number of polymer chains8
Total formula weight432265.59
Authors
He, Y.,Wang, Y.,Liu, B.,Helmling, C.,Susac, L.,Cheng, R.,Zhou, Z.H.,Feigon, J. (deposition date: 2021-02-05, release date: 2021-05-12, Last modification date: 2024-03-06)
Primary citationHe, Y.,Wang, Y.,Liu, B.,Helmling, C.,Susac, L.,Cheng, R.,Zhou, Z.H.,Feigon, J.
Structures of telomerase at several steps of telomere repeat synthesis.
Nature, 593:454-459, 2021
Cited by
PubMed Abstract: Telomerase is unique among the reverse transcriptases in containing a noncoding RNA (known as telomerase RNA (TER)) that includes a short template that is used for the processive synthesis of G-rich telomeric DNA repeats at the 3' ends of most eukaryotic chromosomes. Telomerase maintains genomic integrity, and its activity or dysregulation are critical determinants of human longevity, stem cell renewal and cancer progression. Previous cryo-electron microscopy structures have established the general architecture, protein components and stoichiometries of Tetrahymena and human telomerase, but our understandings of the details of DNA-protein and RNA-protein interactions and of the mechanisms and recruitment involved remain limited. Here we report cryo-electron microscopy structures of active Tetrahymena telomerase with telomeric DNA at different steps of nucleotide addition. Interactions between telomerase reverse transcriptase (TERT), TER and DNA reveal the structural basis of the determination of the 5' and 3' template boundaries, handling of the template-DNA duplex and separation of the product strand during nucleotide addition. The structure and binding interface between TERT and telomerase protein p50 (a homologue of human TPP1) define conserved interactions that are required for telomerase activation and recruitment to telomeres. Telomerase La-related protein p65 remodels several regions of TER, bridging the 5' and 3' ends and the conserved pseudoknot to facilitate assembly of the TERT-TER catalytic core.
PubMed: 33981033
DOI: 10.1038/s41586-021-03529-9
PDB entries with the same primary citation
Experimental method
ELECTRON MICROSCOPY (3.8 Å)
Structure validation

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