3OIQ

Crystal structure of yeast telomere protein Cdc13 OB1 and the catalytic subunit of DNA polymerase alpha Pol1

Summary for 3OIQ

• Entry DOI: 10.2210/pdb3oiq/pdb
• Related: 3OIP
• Descriptor: Cell division control protein 13, DNA polymerase alpha catalytic subunit A (3 entities in total)
• Functional Keywords: ob fold, dimer, dimeric complex, protein binding
• Biological source: Saccharomyces cerevisiae (brewer's yeast,lager beer yeast,yeast); More
• Cellular location: Chromosome, telomere: P32797; Nucleus: P13382
• Total number of polymer chains: 2
• Total formula weight: 30713.07

Authors

Sun, J.,Yang, Y.,Wan, K.,Mao, N.,Yu, T.Y.,Lin, Y.C.,DeZwaan, D.C.,Freeman, B.C.,Lin, J.J.,Lue, N.F.,Lei, M. (deposition date: 2010-08-19, release date: 2010-11-03, Last modification date: 2023-09-06)

Primary citation

Sun, J.,Yang, Y.,Wan, K.,Mao, N.,Yu, T.Y.,Lin, Y.C.,DeZwaan, D.C.,Freeman, B.C.,Lin, J.J.,Lue, N.F.,Lei, M.
Structural bases of dimerization of yeast telomere protein Cdc13 and its interaction with the catalytic subunit of DNA polymerase alpha.
Cell Res., 21:258-274, 2011

PubMed 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.

PubMed: 20877309
DOI: 10.1038/cr.2010.138

Experimental method

X-RAY DIFFRACTION (2.4 Å)