2D5R

Crystal Structure of a Tob-hCaf1 Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.225 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis for the antiproliferative activity of the Tob-hCaf1 complex.

Horiuchi, M.Takeuchi, K.Noda, N.Muroya, N.Suzuki, T.Nakamura, T.Kawamura-Tsuzuku, J.Takahasi, K.Yamamoto, T.Inagaki, F.

(2009) J Biol Chem 284: 13244-13255

  • DOI: 10.1074/jbc.M809250200
  • Primary Citation of Related Structures:  
    2D5R

  • PubMed Abstract: 
  • The Tob/BTG family is a group of antiproliferative proteins containing two highly homologous regions, Box A and Box B. These proteins all associate with CCR4-associated factor 1 (Caf1), which belongs to the ribonuclease D (RNase D) family of deadenylases and is a component of the CCR4-Not deadenylase complex ...

    The Tob/BTG family is a group of antiproliferative proteins containing two highly homologous regions, Box A and Box B. These proteins all associate with CCR4-associated factor 1 (Caf1), which belongs to the ribonuclease D (RNase D) family of deadenylases and is a component of the CCR4-Not deadenylase complex. Here we determined the crystal structure of the complex of the N-terminal region of Tob and human Caf1 (hCaf1). Tob exhibited a novel fold, whereas hCaf1 most closely resembled the catalytic domain of yeast Pop2 and human poly(A)-specific ribonuclease. Interestingly, the association of hCaf1 was mediated by both Box A and Box B of Tob. Cell growth assays using both wild-type and mutant proteins revealed that deadenylase activity of Caf1 is not critical but complex formation is crucial to cell growth inhibition. Caf1 tethers Tob to the CCR4-Not deadenylase complex, and thereby Tob gathers several factors at its C-terminal region, such as poly(A)-binding proteins, to exert antiproliferative activity.


    Organizational Affiliation

    Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CCR4-NOT transcription complex subunit 7A252Homo sapiensMutation(s): 0 
Gene Names: CNOT7CAF1
EC: 3.1.13.4
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UIV1 (Homo sapiens)
Explore Q9UIV1 
Go to UniProtKB:  Q9UIV1
PHAROS:  Q9UIV1
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tob1 proteinB116Homo sapiensMutation(s): 0 
Gene Names: TOB1TOBTROB1
UniProt & NIH Common Fund Data Resources
Find proteins for P50616 (Homo sapiens)
Explore P50616 
Go to UniProtKB:  P50616
PHAROS:  P50616
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.225 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.505α = 90
b = 151.505β = 90
c = 114.181γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance