4CA1

Crystal structure of Siah1 at 1.58 A resolution.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.141 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Two High-Resolution Structures of the Human E3 Ubiquitin Ligase Siah1.

Rimsa, V.Eadsforth, T.C.Hunter, W.N.

(2013) Acta Crystallogr.,Sect.F 96: 1339

  • DOI: 10.1107/S1744309113031448
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Siah1 is an E3 ubiquitin ligase that contributes to proteasome-mediated degradation of multiple targets in key cellular processes and which shows promise as a therapeutic target in oncology. Structures of a truncated Siah1 bound to peptide-based inhi ...

    Siah1 is an E3 ubiquitin ligase that contributes to proteasome-mediated degradation of multiple targets in key cellular processes and which shows promise as a therapeutic target in oncology. Structures of a truncated Siah1 bound to peptide-based inhibitors have been reported. Here, new crystallization conditions have allowed the determination of a construct encompassing dual zinc-finger subdomains and substrate-binding domains at significantly higher resolution. Although the crystals appear isomorphous, two structures present distinct states in which the spatial orientation of one zinc-finger subdomain differs with respect to the rest of the dimeric protein. Such a difference, which is indicative of conformational freedom, infers potential biological relevance related to recognition of binding partners. The crystallization conditions and improved models of Siah1 may aid future studies investigating Siah1-ligand complexes.


    Organizational Affiliation

    Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
E3 UBIQUITIN-PROTEIN LIGASE SIAH1
A, B
195Homo 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
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.141 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 76.060α = 90.00
b = 104.120β = 90.00
c = 133.590γ = 90.00
Software Package:
Software NamePurpose
iMOSFLMdata reduction
PHASERphasing
Aimlessdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-16
    Type: Initial release
  • Version 1.1: 2013-12-11
    Type: Database references
  • Version 1.2: 2013-12-18
    Type: Database references