2UUV

alkyldihydroxyacetonephosphate synthase in P1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 

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This is version 1.1 of the entry. See complete history


Literature

The Crucial Step in Ether Phospholipid Biosynthesis: Structural Basis of a Noncanonical Reaction Associated with a Peroxisomal Disorder.

Razeto, A.Mattiroli, F.Carpanelli, E.Aliverti, A.Pandini, V.Coda, A.Mattevi, A.

(2007) Structure 15: 683

  • DOI: 10.1016/j.str.2007.04.009
  • Primary Citation of Related Structures:  
    2UUU, 2UUV

  • PubMed Abstract: 
  • Ether phospholipids are essential constituents of eukaryotic cell membranes. Rhizomelic chondrodysplasia punctata type 3 is a severe peroxisomal disorder caused by inborn deficiency of alkyldihydroxyacetonephosphate synthase (ADPS). The enzyme carries out the most characteristic step in ether phospholipid biosynthesis: formation of the ether bond ...

    Ether phospholipids are essential constituents of eukaryotic cell membranes. Rhizomelic chondrodysplasia punctata type 3 is a severe peroxisomal disorder caused by inborn deficiency of alkyldihydroxyacetonephosphate synthase (ADPS). The enzyme carries out the most characteristic step in ether phospholipid biosynthesis: formation of the ether bond. The crystal structure of ADPS from Dictyostelium discoideum shows a fatty-alcohol molecule bound in a narrow hydrophobic tunnel, specific for aliphatic chains of 16 carbons. Access to the tunnel is controlled by a flexible loop and a gating helix at the protein-membrane interface. Structural and mutagenesis investigations identify a cluster of hydrophilic catalytic residues, including an essential tyrosine, possibly involved in substrate proton abstraction, and the arginine that is mutated in ADPS-deficient patients. We propose that ether bond formation might be orchestrated through a covalent imine intermediate with the flavin, accounting for the noncanonical employment of a flavin cofactor in a nonredox reaction.


    Organizational Affiliation

    Dipartimento di Genetica e Microbiologia, Università di Pavia, via Ferrata 1, 27100 Pavia, Italy.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALKYLDIHYDROXYACETONEPHOSPHATE SYNTHASEA, B, C, D584Dictyostelium discoideumMutation(s): 0 
Gene Names: eapADDB_G0286183
EC: 2.5.1.26
UniProt
Find proteins for O96759 (Dictyostelium discoideum)
Explore O96759 
Go to UniProtKB:  O96759
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO96759
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.8α = 114
b = 98β = 93
c = 107γ = 103
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
SHELXDphasing
SHELXEphasing
REFMACrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-06-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance