2W8J

SPT with PLP-ser


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.159 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The External-Aldimine Form of Serine Palmitoyltranserase; Structural, Kinetic and Spectroscopic Analysis of the Wild-Type Enzyme and Hsan1 Mutant Mimics.

Raman, M.C.C.Johnson, K.A.Yard, B.A.Lowther, J.Carter, L.G.Naismith, J.H.Campopiano, D.J.

(2009) J Biol Chem 284: 17328

  • DOI: 10.1074/jbc.M109.008680
  • Primary Citation of Related Structures:  
    2W8J, 2W8T, 2W8U, 2W8V, 2W8W

  • PubMed Abstract: 
  • Sphingolipid biosynthesis begins with the condensation of L-serine and palmitoyl-CoA catalyzed by the PLP-dependent enzyme serine palmitoyltransferase (SPT). Mutations in human SPT cause hereditary sensory autonomic neuropathy type 1, a disease chara ...

    Sphingolipid biosynthesis begins with the condensation of L-serine and palmitoyl-CoA catalyzed by the PLP-dependent enzyme serine palmitoyltransferase (SPT). Mutations in human SPT cause hereditary sensory autonomic neuropathy type 1, a disease characterized by loss of feeling in extremities and severe pain. The human enzyme is a membrane-bound hetereodimer, and the most common mutations are located in the enzymatically incompetent monomer, suggesting a "dominant" or regulatory effect. The molecular basis of how these mutations perturb SPT activity is subtle and is not simply loss of activity. To further explore the structure and mechanism of SPT, we have studied the homodimeric bacterial enzyme from Sphingomonas paucimobilis. We have analyzed two mutants (N100Y and N100W) engineered to mimic the mutations seen in hereditary sensory autonomic neuropathy type 1 as well as a third mutant N100C designed to mimic the wild-type human SPT. The N100C mutant appears fully active, whereas both N100Y and N100W are significantly compromised. The structures of the holoenzymes reveal differences around the active site and in neighboring secondary structure that transmit across the dimeric interface in both N100Y and N100W. Comparison of the l-Ser external aldimine structures of both native and N100Y reveals significant differences that hinder the movement of a catalytically important Arg(378) residue into the active site. Spectroscopic analysis confirms that both N100Y and N100W mutants subtly affect the chemistry of the PLP. Furthermore, the N100Y and R378A mutants appear less able to stabilize a quinonoid intermediate. These data provide the first experimental insight into how the most common disease-associated mutations of human SPT may lead to perturbation of enzyme activity.


    Organizational Affiliation

    EaStChem, School of Chemistry, University of Edinburgh, Edinburgh EH9 3JJ, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SERINE PALMITOYLTRANSFERASEA427Sphingomonas paucimobilisMutation(s): 0 
Gene Names: SPT1DRN02_007885
Find proteins for Q93UV0 (Sphingomonas paucimobilis)
Explore Q93UV0 
Go to UniProtKB:  Q93UV0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLS
Query on PLS

Download CCD File 
A
[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL]-SERINE
C11 H17 N2 O8 P
ODVKKQWXKRZJLG-VIFPVBQESA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
PLSKd :  1100000   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.159 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.248α = 90
b = 108.375β = 90
c = 91.213γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-01-27
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance