2JGT

Low resolution structure of SPT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.250 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The Structure of Serine Palmitoyltransferase; Gateway to Sphingolipid Biosynthesis.

Yard, B.A.Carter, L.G.Johnson, K.A.Overton, I.M.Dorward, M.Liu, H.Mcmahon, S.A.Oke, M.Puech, D.Barton, G.J.Naismith, J.H.Campopiano, D.J.

(2007) J.Mol.Biol. 370: 870

  • DOI: 10.1016/j.jmb.2007.04.086
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Sphingolipid biosynthesis commences with the condensation of L-serine and palmitoyl-CoA to produce 3-ketodihydrosphingosine (KDS). This reaction is catalysed by the PLP-dependent enzyme serine palmitoyltransferase (SPT; EC 2.3.1.50), which is a membr ...

    Sphingolipid biosynthesis commences with the condensation of L-serine and palmitoyl-CoA to produce 3-ketodihydrosphingosine (KDS). This reaction is catalysed by the PLP-dependent enzyme serine palmitoyltransferase (SPT; EC 2.3.1.50), which is a membrane-bound heterodimer (SPT1/SPT2) in eukaryotes such as humans and yeast and a cytoplasmic homodimer in the Gram-negative bacterium Sphingomonas paucimobilis. Unusually, the outer membrane of S. paucimobilis contains glycosphingolipid (GSL) instead of lipopolysaccharide (LPS), and SPT catalyses the first step of the GSL biosynthetic pathway in this organism. We report here the crystal structure of the holo-form of S. paucimobilis SPT at 1.3 A resolution. The enzyme is a symmetrical homodimer with two active sites and a monomeric tertiary structure consisting of three domains. The PLP cofactor is bound covalently to a lysine residue (Lys265) as an internal aldimine/Schiff base and the active site is composed of residues from both subunits, located at the bottom of a deep cleft. Models of the human SPT1/SPT2 heterodimer were generated from the bacterial structure by bioinformatics analysis. Mutations in the human SPT1-encoding subunit have been shown to cause a neuropathological disease known as hereditary sensory and autonomic neuropathy type I (HSAN1). Our models provide an understanding of how these mutations may affect the activity of the enzyme.


    Organizational Affiliation

    School of Chemistry, EaStCHEM, The University of Edinburgh, West Mains Road, Edinburgh, EH9 3JJ, Scotland, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SERINE PALMITOYLTRANSFERASE
A, B
422Sphingomonas paucimobilisMutation(s): 0 
Gene Names: SPT1
Find proteins for Q93UV0 (Sphingomonas paucimobilis)
Go to UniProtKB:  Q93UV0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.250 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 93.866α = 90.00
b = 109.537β = 90.00
c = 187.031γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance