Structure of Est3 Reveals a Bimodal Surface with Differential Roles in Telomere Replication

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2013 Dec 18

PMID 24344315

Citations 25

Authors

Timsi Rao

Johnathan W Lubin

Geoffrey S Armstrong

Timothy M Tucey

Victoria Lundblad

Deborah S Wuttke

Affiliations

Soon will be listed here.

Abstract

Telomerase is essential for continuous cellular proliferation. Substantial insights have come from studies of budding yeast telomerase, which consists of a catalytic core in association with two regulatory proteins, ever shorter telomeres 1 and 3 (Est1 and Est3). We report here a high-resolution structure of the Est3 telomerase subunit determined using a recently developed strategy that combines minimal NMR experimental data with Rosetta de novo structure prediction algorithms. Est3 adopts an overall protein fold which is structurally similar to that adopted by the shelterin component TPP1. However, the characteristics of the surface of the experimentally determined Est3 structure are substantially different from those predicted by prior homology-based models of Est3. Structure-guided mutagenesis of the complete surface of the Est3 protein reveals two adjacent patches on a noncanonical face of the protein that differentially mediate telomere function. Mapping these two patches on the Est3 structure defines a set of shared features between Est3 and HsTPP1, suggesting an analogous multifunctional surface on TPP1.

Citing Articles

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