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Structural bases of dimerization of yeast telomere protein Cdc13 and its interaction with the catalytic subunit of DNA polymerase α.

TitleStructural bases of dimerization of yeast telomere protein Cdc13 and its interaction with the catalytic subunit of DNA polymerase α.
Publication TypeJournal Article
Year of Publication2011
AuthorsSun J, Yang Y, Wan K, Mao N, Yu T-Y, Lin Y-C, DeZwaan DC, Freeman BC, Lin J-J, Lue NF, Lei M
JournalCell Res
Volume21
Issue2
Pagination258-74
Date Published2011 Feb
ISSN1748-7838
KeywordsCatalytic Domain, Crystallography, X-Ray, Dimerization, DNA Polymerase I, Mutation, Protein Binding, Protein Structure, Tertiary, Replication Protein A, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Telomere, Telomere-Binding Proteins
Abstract

Budding yeast Cdc13-Stn1-Ten1 (CST) complex plays an essential role in telomere protection and maintenance, and has been proposed to be a telomere-specific replication protein A (RPA)-like complex. Previous genetic and structural studies revealed a close resemblance between Stn1-Ten1 and RPA32-RPA14. However, the relationship between Cdc13 and RPA70, the largest subunit of RPA, has remained unclear. Here, we report the crystal structure of the N-terminal OB (oligonucleotide/oligosaccharide binding) fold of Cdc13. Although Cdc13 has an RPA70-like domain organization, the structures of Cdc13 OB folds are significantly different from their counterparts in RPA70, suggesting that they have distinct evolutionary origins. Furthermore, our structural and biochemical analyses revealed unexpected dimerization by the N-terminal OB fold and showed that homodimerization is probably a conserved feature of all Cdc13 proteins. We also uncovered the structural basis of the interaction between the Cdc13 N-terminal OB fold and the catalytic subunit of DNA polymerase α (Pol1), and demonstrated a role for Cdc13 dimerization in Pol1 binding. Analysis of the phenotypes of mutants defective in Cdc13 dimerization and Cdc13-Pol1 interaction revealed multiple mechanisms by which dimerization regulates telomere lengths in vivo. Collectively, our findings provide novel insights into the mechanisms and evolution of Cdc13.

DOI10.1038/cr.2010.138
Alternate JournalCell Res
PubMed ID20877309
PubMed Central IDPMC3193437
Grant ListGM062631 / GM / NIGMS NIH HHS / United States
GM 083015-01 / GM / NIGMS NIH HHS / United States
T32 HL007121 / HL / NHLBI NIH HHS / United States
DK074270 / DK / NIDDK NIH HHS / United States
R01 GM062631 / GM / NIGMS NIH HHS / United States
R01 GM083015 / GM / NIGMS NIH HHS / United States
/ / Howard Hughes Medical Institute / United States
R01 DK074270 / DK / NIDDK NIH HHS / United States

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