National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM131901
United States
National Science Foundation (NSF, United States)
MCB2016540
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM071940
United States
Citation
Journal: Nature / Year: 2021 Title: Structures of telomerase at several steps of telomere repeat synthesis. Authors: Yao He / Yaqiang Wang / Baocheng Liu / Christina Helmling / Lukas Sušac / Ryan Cheng / Z Hong Zhou / Juli Feigon / 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 ...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.
History
Deposition
Feb 5, 2021
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Header (metadata) release
Jun 2, 2021
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Map release
Jun 2, 2021
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Update
Jun 2, 2021
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Current status
Jun 2, 2021
Processing site: RCSB / Status: Released
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