2W8P

The crystal structure of human C340A SSADH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Redox-Switch Modulation of Human Ssadh by Dynamic Catalytic Loop.

Kim, Y.-G.Lee, S.Kwon, O.-S.Park, S.-Y.Lee, S.-J.Park, B.-J.Kim, K.-J.

(2009) Embo J. 28: 959

  • DOI: 10.1038/emboj.2009.40
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Succinic semialdehyde dehydrogenase (SSADH) is involved in the final degradation step of the inhibitory neurotransmitter gamma-aminobutyric acid by converting succinic semialdehyde to succinic acid in the mitochondrial matrix. SSADH deficiency, a rar ...

    Succinic semialdehyde dehydrogenase (SSADH) is involved in the final degradation step of the inhibitory neurotransmitter gamma-aminobutyric acid by converting succinic semialdehyde to succinic acid in the mitochondrial matrix. SSADH deficiency, a rare autosomal recessive disease, exhibits variable clinical phenotypes, including psychomotor retardation, language delay, behaviour disturbance and convulsions. Here, we present crystal structures of both the oxidized and reduced forms of human SSADH. Interestingly, the structures show that the catalytic loop of the enzyme undergoes large structural changes depending on the redox status of the environment, which is mediated by a reversible disulphide bond formation between a catalytic Cys340 and an adjacent Cys342 residues located on the loop. Subsequent in vivo and in vitro studies reveal that the 'dynamic catalytic loop' confers a response to reactive oxygen species and changes in redox status, indicating that the redox-switch modulation could be a physiological control mechanism of human SSADH. Structural basis for the substrate specificity of the enzyme and the impact of known missense point mutations associated with the disease pathogenesis are presented as well.


    Organizational Affiliation

    Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Kyungbuk, Republic of Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUCCINIC SEMIALDEHYDE DEHYDROGENASE MITOCHONDRIAL
A
487Homo sapiensMutation(s): 1 
Gene Names: ALDH5A1 (SSADH)
EC: 1.2.1.24
Find proteins for P51649 (Homo sapiens)
Go to Gene View: ALDH5A1
Go to UniProtKB:  P51649
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
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: 2.3 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.229 
  • Space Group: F 4 3 2
Unit Cell:
Length (Å)Angle (°)
a = 265.895α = 90.00
b = 265.895β = 90.00
c = 265.895γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
MOLREPphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-01-19 
  • Released Date: 2009-06-09 
  • Deposition Author(s): Kim, Y.-G., Kim, K.-J.

Revision History 

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2013-08-07
    Type: Derived calculations, Non-polymer description, Other, Source and taxonomy, Structure summary, Version format compliance