2A26

Crystal structure of the N-terminal, dimerization domain of Siah Interacting Protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

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This is version 1.2 of the entry. See complete history


Literature

Structural Analysis of Siah1-Siah-interacting Protein Interactions and Insights into the Assembly of an E3 Ligase Multiprotein Complex

Santelli, E.Leone, M.Li, C.Fukushima, T.Preece, N.E.Olson, A.J.Ely, K.R.Reed, J.C.Pellecchia, M.Liddington, R.C.Matsuzawa, S.

(2005) J Biol Chem 280: 34278-34287

  • DOI: 10.1074/jbc.M506707200
  • Primary Citation of Related Structures:  
    2A26, 2A25

  • PubMed Abstract: 
  • Siah1 is the central component of a multiprotein E3 ubiquitin ligase complex that targets beta-catenin for destruction in response to p53 activation. The E3 complex comprises, in addition to Siah1, Siah-interacting protein (SIP), the adaptor protein Skp1, and the F-box protein Ebi ...

    Siah1 is the central component of a multiprotein E3 ubiquitin ligase complex that targets beta-catenin for destruction in response to p53 activation. The E3 complex comprises, in addition to Siah1, Siah-interacting protein (SIP), the adaptor protein Skp1, and the F-box protein Ebi. Here we show that SIP engages Siah1 by means of two elements, both of which are required for mediating beta-catenin destruction in cells. An N-terminal dimerization domain of SIP sits across the saddle-shaped upper surface of Siah1, with two extended legs packing against the sides of Siah1 by means of a consensus PXAXVXP motif that is common to a family of Siah-binding proteins. The C-terminal domain of SIP, which binds to Skp1, protrudes from the lower surface of Siah1, and we propose that this surface provides the scaffold for bringing substrate and the E2 enzyme into apposition in the functional complex.


    Organizational Affiliation

    The Burnham Institute, La Jolla, California 92037, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calcyclin-binding proteinA, B, C50Homo sapiensMutation(s): 0 
Gene Names: CACYBPS100A6BPSIPPNAS-107
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HB71 (Homo sapiens)
Explore Q9HB71 
Go to UniProtKB:  Q9HB71
PHAROS:  Q9HB71
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CXS (Subject of Investigation/LOI)
Query on CXS

Download Ideal Coordinates CCD File 
E [auth B]3-CYCLOHEXYL-1-PROPYLSULFONIC ACID
C9 H19 N O3 S
PJWWRFATQTVXHA-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
D [auth B]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.793α = 90
b = 152.609β = 90
c = 36.988γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-09
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance