6W6W

Cryo-EM structure of CST bound to telomeric single-stranded DNA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history


Literature

The structure of human CST reveals a decameric assembly bound to telomeric DNA.

Lim, C.J.Barbour, A.T.Zaug, A.J.Goodrich, K.J.McKay, A.E.Wuttke, D.S.Cech, T.R.

(2020) Science 368: 1081-1085

  • DOI: 10.1126/science.aaz9649
  • Primary Citation of Related Structures:  
    6W6W

  • PubMed Abstract: 
  • The CTC1-STN1-TEN1 (CST) complex is essential for telomere maintenance and resolution of stalled replication forks genome-wide. Here, we report the 3.0-angstrom cryo-electron microscopy structure of human CST bound to telomeric single-stranded DNA (ssDNA), which assembles as a decameric supercomplex ...

    The CTC1-STN1-TEN1 (CST) complex is essential for telomere maintenance and resolution of stalled replication forks genome-wide. Here, we report the 3.0-angstrom cryo-electron microscopy structure of human CST bound to telomeric single-stranded DNA (ssDNA), which assembles as a decameric supercomplex. The atomic model of the 134-kilodalton CTC1 subunit, built almost entirely de novo, reveals the overall architecture of CST and the DNA-binding anchor site. The carboxyl-terminal domain of STN1 interacts with CTC1 at two separate docking sites, allowing allosteric mediation of CST decamer assembly. Furthermore, ssDNA appears to staple two monomers to nucleate decamer assembly. CTC1 has stronger structural similarity to Replication Protein A than the expected similarity to yeast Cdc13. The decameric structure suggests that CST can organize ssDNA analogously to the nucleosome's organization of double-stranded DNA.


    Organizational Affiliation

    Howard Hughes Medical Institute, University of Colorado Boulder, Boulder, CO 80303, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CST complex subunit CTC1A,
C [auth B]
1233Homo sapiensMutation(s): 0 
Gene Names: CTC1C17orf68
UniProt & NIH Common Fund Data Resources
Find proteins for Q2NKJ3 (Homo sapiens)
Explore Q2NKJ3 
Go to UniProtKB:  Q2NKJ3
PHAROS:  Q2NKJ3
GTEx:  ENSG00000178971 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2NKJ3
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CST complex subunit STN1D [auth C]374Homo sapiensMutation(s): 0 
Gene Names: STN1OBFC1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H668 (Homo sapiens)
Explore Q9H668 
Go to UniProtKB:  Q9H668
PHAROS:  Q9H668
GTEx:  ENSG00000107960 
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UniProt GroupQ9H668
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
CST complex subunit TEN1E [auth D]152Homo sapiensMutation(s): 0 
Gene Names: TEN1C17orf106
UniProt & NIH Common Fund Data Resources
Find proteins for Q86WV5 (Homo sapiens)
Explore Q86WV5 
Go to UniProtKB:  Q86WV5
GTEx:  ENSG00000257949 
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UniProt GroupQ86WV5
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*TP*AP*GP*G)-3')B [auth E]4Homo sapiens
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN (Subject of Investigation/LOI)
Query on ZN

Download Ideal Coordinates CCD File 
F [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United StatesTom Cech HHMI Investigator
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM099705
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM059414
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesK99GM131023
National Science Foundation (NSF, United States)United StatesMCB 1716425
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesT32GM008759

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-03
    Type: Initial release
  • Version 1.1: 2020-06-17
    Changes: Database references