1ZWX

Crystal Structure of SmcL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structure of SmcL, a bacterial neutral sphingomyelinase C from Listeria.

Openshaw, A.E.A.Race, P.R.Monzo, H.J.Vasquez-Boland, J.A.Banfield, M.J.

(2005) J Biol Chem 280: 35011-35017

  • DOI: https://doi.org/10.1074/jbc.M506800200
  • Primary Citation of Related Structures:  
    1ZWX

  • PubMed Abstract: 

    Sphingomyelinases C are enzymes that catalyze the hydrolysis of sphingomyelin in biological membranes to ceramide and phosphorylcholine. Various pathogenic bacteria produce secreted neutral sphingomyelinases C that act as membrane-damaging virulence factors. Mammalian neutral sphingomyelinases C, which display sequence homology to the bacterial enzymes, are involved in sphingolipid metabolism and signaling. This article describes the first structure to be determined for a member of the neutral sphingomyelinase C family, SmcL, from the intracellular bacterial pathogen Listeria ivanovii. The structure has been refined to 1.9-A resolution with phases derived by single isomorphous replacement with anomalous scattering techniques from a single iridium derivative. SmcL adopts a DNase I-like fold, and is the first member of this protein superfamily to have its structure determined that acts as a phospholipase. The structure reveals several unique features that adapt the protein to its phospholipid substrate. These include large hydrophobic beta-hairpin and hydrophobic loops surrounding the active site that may bind and penetrate the lipid bilayer to position sphingomyelin in a catalytically competent position. The structure also provides insight into the proposed general base/acid catalytic mechanism, in which His-325 and His-185 play key roles.


  • Organizational Affiliation

    Institute for Cell and Molecular Biosciences, University of Newcastle upon Tyne, Framlington Place, Newcastle upon Tyne, NE2 4HH United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
sphingomyelinase-c301Listeria ivanoviiMutation(s): 0 
Gene Names: smcl
EC: 3.1.4.12
Membrane Entity: Yes 
UniProt
Find proteins for Q9RLV9 (Listeria ivanovii)
Explore Q9RLV9 
Go to UniProtKB:  Q9RLV9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9RLV9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.203 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.86α = 90
b = 66.86β = 90
c = 180.848γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
SOLVEphasing
RESOLVEphasing
REFMACrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-16
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations