Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 263.92 kDa 
• Atom Count: 8079 
• Modelled Residue Count: 1227 
• Deposited Residue Count: 2440 
• Unique protein chains: 3

7F4U

Cryo-EM structure of TELO2-TTI1-TTI2 complex

• PDB DOI: 10.2210/pdb7F4U/pdb
• EM Map EMD-31454: EMDB EMDataResource

• Classification: CHAPERONE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2021-06-21 Released: 2022-06-22 
• Deposition Author(s): Cho, Y., Kim, Y.
• Funding Organization(s): National Research Foundation (NRF, Korea)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structure of the Human TELO2-TTI1-TTI2 Complex.

Kim, Y., Park, J., Joo, S.Y., Kim, B.G., Jo, A., Lee, H., Cho, Y.

(2022) J Mol Biol 434: 167370-167370

• PubMed: 34838521 
• DOI: 10.1016/j.jmb.2021.167370
• Primary Citation of Related Structures:  
  7F4U


• PubMed Abstract: 
  

Phosphatidylinositol 3-kinase-related protein kinases (PIKKs) play critical roles in various metabolic pathways related to cell proliferation and survival. The TELO2-TTI1-TTI2 (TTT) complex has been proposed to recognize newly synthesized PIKKs and to deliver them to the R2TP complex (RUVBL1-RUVBL2-RPAP3-PIH1D1) and the heat shock protein 90 chaperone, thereby supporting their folding and assembly. Here, we determined the cryo-EM structure of the TTT complex at an average resolution of 4.2 Å. We describe the full-length structures of TTI1 and TELO2, and a partial structure of TTI2. All three proteins form elongated helical repeat structures. TTI1 provides a platform on which TELO2 and TTI2 bind to its central region and C-terminal end, respectively. The TELO2 C-terminal domain (CTD) is required for the interaction with TTI1 and recruitment of Ataxia-telangiectasia mutated (ATM). The N- and C-terminal segments of TTI1 recognize the FRAP-ATM-TRRAP (FAT) domain and the N-terminal HEAT repeats of ATM, respectively. The TELO2 CTD and TTI1 N- and C-terminal segments are required for cell survival in response to ionizing radiation.

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Organizational Affiliation: 

Department of Life Science, Pohang University of Science and Technology, Pohang 37673, South Korea. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Telomere length regulation protein TEL2 homolog	A	837	Homo sapiens	Mutation(s): 0  Gene Names: TELO2, KIAA0683
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y4R8 (Homo sapiens) Explore Q9Y4R8  Go to UniProtKB:  Q9Y4R8
PHAROS:  Q9Y4R8

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TELO2-interacting protein 1 homolog	B	1095	Homo sapiens	Mutation(s): 0  Gene Names: TTI1, KIAA0406, SMG10
UniProt & NIH Common Fund Data Resources
Find proteins for O43156 (Homo sapiens) Explore O43156  Go to UniProtKB:  O43156
PHAROS:  O43156

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
TELO2-interacting protein 2	C	508	Homo sapiens	Mutation(s): 0  Gene Names: TTI2, C8orf41

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2021-06-21 
• Released Date: 2022-06-22 
Deposition Author(s): Cho, Y., Kim, Y.

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Funding Organization	Location	Grant Number
National Research Foundation (NRF, Korea)	Korea, Republic Of	--

Revision History  

• Version 1.0: 2022-06-22
  Type: Initial release