ISDA

Entry Detail

PDB ID:

5DOK

Keywords:

DNA BINDING PROTEIN

Title:

Crystal structure of Tetrahymena p45C

Biological Source:

Source Organism:

Tetrahymena thermophila

Host Organism:

Escherichia coli BL21(DE3)

PDB Version:

Deposition Date:

2015-09-11

Release Date:

2015-11-25

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.30 Å

R-Value Free:

0.27

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

C 1 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Telomerase associated protein p45
Chain IDs:A, B
Chain Length:204
Number of Molecules:2
Biological Source:Tetrahymena thermophila

UniProt ID:Q6JXI5

Ligand Molecules

Primary Citation

The Tetrahymena telomerase p75-p45-p19 subcomplex is a unique CST complex

Wan, B, Tang, T, Upton, H, Shuai, J, Zhou, Y, Li, S, Chen, J, Brunzelle, J.S, Zeng, Z, Collins, K, Wu, J, Lei, M.Show

Nat.Struct.Mol.Biol. 22 1023 1026 (2015)

PMID: 26551074 DOI: 10.1038/nsmb.3126

Abstact

Tetrahymena telomerase holoenzyme subunits p75, p45 and p19 form a subcomplex (7-4-1) peripheral to the catalytic core. We report structures of p45 and p19 and reveal them as the Stn1 and Ten1 subunits of the CST complex, which stimulates telomerase complementary-strand synthesis. 7-4-1 binds telomeric single-stranded DNA, and mutant p19 overexpression causes telomere 3'-overhang elongation. We propose that telomerase-tethered Tetrahymena CST coordinates telomere G-strand and C-strand synthesis.

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Primary Citation of related structures