2A25

Crystal structure of Siah1 SBD bound to the peptide EKPAAVVAPITTG from SIP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


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:  

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin ligase SIAH1
A
193Homo sapiensMutation(s): 0 
Gene Names: SIAH1 (HUMSIAH)
EC: 2.3.2.27
Find proteins for Q8IUQ4 (Homo sapiens)
Go to Gene View: SIAH1
Go to UniProtKB:  Q8IUQ4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calcyclin-binding protein peptide
B
13Homo sapiensMutation(s): 0 
Gene Names: CACYBP (S100A6BP, SIP)
Find proteins for Q9HB71 (Homo sapiens)
Go to Gene View: CACYBP
Go to UniProtKB:  Q9HB71
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.213 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 47.635α = 90.00
b = 107.761β = 90.00
c = 78.414γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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