1TH1

Beta-catenin in complex with a phosphorylated APC 20aa repeat fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal Structure of a beta-Catenin/APC Complex Reveals a Critical Role for APC Phosphorylation in APC Function.

Xing, Y.Clements, W.K.Le Trong, I.Hinds, T.R.Stenkamp, R.Kimelman, D.Xu, W.

(2004) Mol Cell 15: 523-533

  • DOI: 10.1016/j.molcel.2004.08.001
  • Primary Citation of Related Structures:  
    1TH1

  • PubMed Abstract: 
  • The tumor suppressor adenomatous polyposis coli (APC) plays a critical role in the turnover of cytosolic beta-catenin, the key effector of the canonical Wnt signaling pathway. APC contains seven 20 amino acid (20 aa) beta-catenin binding repeats that ...

    The tumor suppressor adenomatous polyposis coli (APC) plays a critical role in the turnover of cytosolic beta-catenin, the key effector of the canonical Wnt signaling pathway. APC contains seven 20 amino acid (20 aa) beta-catenin binding repeats that are required for beta-catenin turnover. We have determined the crystal structure of beta-catenin in complex with a phosphorylated APC fragment containing two 20 aa repeats. Surprisingly, one single phosphorylated 20 aa repeat, together with its flanking regions, covers the entire structural groove of beta-catenin and may thus compete for beta-catenin binding with all other beta-catenin armadillo repeat partners. Our biochemical studies show that phosphorylation of the APC 20 aa repeats increases the affinity of the repeats for beta-catenin by 300- to 500-fold and the phosphorylated 20 aa repeats prevent beta-catenin binding to Tcf. Our work suggests that the phosphorylation of the APC 20 aa repeats could be a critical switch for APC function.


    Organizational Affiliation

    Department of Biological Structure, University of Washington, Seattle, WA 98195, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-cateninAB532Homo sapiensMutation(s): 0 
Gene Names: CTNNB1CTNNBOK/SW-cl.35PRO2286
Find proteins for P35222 (Homo sapiens)
Explore P35222 
Go to UniProtKB:  P35222
NIH Common Fund Data Resources
PHAROS  P35222
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Adenomatous polyposis coli proteinCD179Homo sapiensMutation(s): 5 
Gene Names: APCDP2.5
Find proteins for P25054 (Homo sapiens)
Explore P25054 
Go to UniProtKB:  P25054
NIH Common Fund Data Resources
PHAROS  P25054
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
C,DL-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
C,DL-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.225 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.159α = 90
b = 133.8β = 110.85
c = 82.166γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance