3KF6

Crystal structure of S. pombe Stn1-ten1 complex

DOI: 10.2210/pdb3KF6/pdb

Classification: STRUCTURAL PROTEIN
Organism(s): Schizosaccharomyces pombe
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2009-10-27 Released: 2009-12-22
Deposition Author(s): Sun, J., Yu, E.Y., Yang, Y.T., Confer, L.A., Sun, S.H., Wan, K., Lue, N.F., Lei, M.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.65 Å
R-Value Free: 0.244
R-Value Work: 0.226
R-Value Observed: 0.226

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Stn1-Ten1 is an Rpa2-Rpa3-like complex at telomeres.

Sun, J., Yu, E.Y., Yang, Y., Confer, L.A., Sun, S.H., Wan, K., Lue, N.F., Lei, M.

(2009) Genes Dev 23: 2900-2914

PubMed: 20008938 Search on PubMedSearch on PubMed Central
DOI: 10.1101/gad.1851909
Primary Citation of Related Structures:
3KF6, 3KF8, 3KEY

PubMed Abstract:

In budding yeast, Cdc13, Stn1, and Ten1 form a heterotrimeric complex (CST) that is essential for telomere protection and maintenance. Previous bioinformatics analysis revealed a putative oligonucleotide/oligosaccharide-binding (OB) fold at the N terminus of Stn1 (Stn1N) that shows limited sequence similarity to the OB fold of Rpa2, a subunit of the eukaryotic ssDNA-binding protein complex replication protein A (RPA). Here we present functional and structural analyses of Stn1 and Ten1 from multiple budding and fission yeast. The crystal structure of the Candida tropicalis Stn1N complexed with Ten1 demonstrates an Rpa2N-Rpa3-like complex. In both structures, the OB folds of the two components pack against each other through interactions between two C-terminal helices. The structure of the C-terminal domain of Saccharomyces cerevisiae Stn1 (Stn1C) was found to comprise two related winged helix-turn-helix (WH) motifs, one of which is most similar to the WH motif at the C terminus of Rpa2, again supporting the notion that Stn1 resembles Rpa2. The crystal structure of the fission yeast Schizosaccharomyces pombe Stn1N-Ten1 complex exhibits a virtually identical architecture as the C. tropicalis Stn1N-Ten1. Functional analyses of the Candida albicans Stn1 and Ten1 proteins revealed critical roles for these proteins in suppressing aberrant telomerase and recombination activities at telomeres. Mutations that disrupt the Stn1-Ten1 interaction induce telomere uncapping and abolish the telomere localization of Ten1. Collectively, our structural and functional studies illustrate that, instead of being confined to budding yeast telomeres, the CST complex may represent an evolutionarily conserved RPA-like telomeric complex at the 3' overhangs that works in parallel with or instead of the well-characterized POT1-TPP1/TEBPalpha-beta complex.

Organizational Affiliation:

Howard Hughes Medical Institute, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein stn1	A	159	Schizosaccharomyces pombe	Mutation(s): 0 Gene Names: stn1, SPBC409.12c
Find proteins for Q0E7J7 (Schizosaccharomyces pombe (strain 972 / ATCC 24843)) Explore Q0E7J7 Go to UniProtKB: Q0E7J7
Protein Feature View Expand
Reference Sequence

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein ten1	B	105	Schizosaccharomyces pombe	Mutation(s): 0 Gene Names: ten1, SPCC1393.14
Find proteins for P0C5Y7 (Schizosaccharomyces pombe (strain 972 / ATCC 24843)) Explore P0C5Y7 Go to UniProtKB: P0C5Y7
Protein Feature View Expand
Reference Sequence