1WAB

PLATELET-ACTIVATING FACTOR ACETYLHYDROLASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Brain acetylhydrolase that inactivates platelet-activating factor is a G-protein-like trimer.

Ho, Y.S.Swenson, L.Derewenda, U.Serre, L.Wei, Y.Dauter, Z.Hattori, M.Adachi, T.Aoki, J.Arai, H.Inoue, K.Derewenda, Z.S.

(1997) Nature 385: 89-93

  • DOI: 10.1038/385089a0

  • PubMed Abstract: 
  • The platelet-activating factor PAF (1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine) is a potent lipid first messenger active in general cell activation, fertilization, inflammatory and allergic reactions, asthma, HIV pathogenesis, carcinogenesis, and ...

    The platelet-activating factor PAF (1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine) is a potent lipid first messenger active in general cell activation, fertilization, inflammatory and allergic reactions, asthma, HIV pathogenesis, carcinogenesis, and apoptosis. There is substantial evidence that PAF is involved in intracellular signalling, but the pathways are poorly understood. Inactivation of PAF is carried out by specific intra- and extracellular acetylhydrolases (PAF-AHs), a subfamily of phospholipases A2 that remove the sn-2 acetyl group. Mammalian brain contains at least three intracellular isoforms, of which PAF-AH(Ib) is the best characterized. This isoform contains a heterodimer of two homologous catalytic subunits alpha1 and alpha2, each of relative molecular mass 26K, and a non-catalytic 45K beta-subunit, a homologue of the beta-subunit of trimeric G proteins. We now report the crystal structure of the bovine alpha1 subunit of PAF-AH(Ib) at 1.7 A resolution in complex with a reaction product, acetate. The tertiary fold of this protein is closely reminiscent of that found in p21(ras) and other GTPases. The active site is made up of a trypsin-like triad of Ser 47, His 195 and Asp 192. Thus, the intact PAF-AH(Ib) molecule is an unusual G-protein-like (alpha1/alpha2)beta trimer.


    Related Citations: 
    • The Catalytic Subunit of Bovine Brain Platelet-Activating Factor Acetylhydrolase is a Novel Type of Serine Esterase
      Hattori, M.,Adachi, H.,Tsujimoto, M.,Arai, H.,Inoue, K.
      (1994) J.Biol.Chem. 269: 23150


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia Health Sciences Center, Charlottesville 22906-0011, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PLATELET-ACTIVATING FACTOR ACETYLHYDROLASE
A
232Bos taurusMutation(s): 0 
Gene Names: PAFAH1B3 (PAFAHG)
EC: 3.1.1.47
Find proteins for Q29460 (Bos taurus)
Go to Gene View: PAFAH1B3
Go to UniProtKB:  Q29460
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Work: 0.195 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 81.260α = 90.00
b = 81.260β = 90.00
c = 72.600γ = 120.00
Software Package:
Software NamePurpose
PROLSQrefinement
REFMACrefinement
DENZOdata reduction
X-PLORphasing
X-PLORmodel building
X-PLORrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-11-12
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model