3ZY3

Crystal structure of POFUT1 in complex with GDP (crystal-form-III)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Insights Into the Mechanism of Protein O-Fucosylation.

Lira-Navarrete, E.Valero-Gonzalez, J.Villanueva, R.Martinez-Julvez, M.Tejero, T.Merino, P.Panjikar, S.Hurtado-Guerrero, R.

(2011) Plos One 6: 25365

  • DOI: 10.1371/journal.pone.0025365
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Protein O-fucosylation is an essential post-translational modification, involved in the folding of target proteins and in the role of these target proteins during embryonic development and adult tissue homeostasis, among other things. Two different e ...

    Protein O-fucosylation is an essential post-translational modification, involved in the folding of target proteins and in the role of these target proteins during embryonic development and adult tissue homeostasis, among other things. Two different enzymes are responsible for this modification, Protein O-fucosyltransferase 1 and 2 (POFUT1 and POFUT2, respectively). Both proteins have been characterised biologically and enzymatically but nothing is known at the molecular or structural level. Here we describe the first crystal structure of a catalytically functional POFUT1 in an apo-form and in complex with GDP-fucose and GDP. The enzyme belongs to the GT-B family and is not dependent on manganese for activity. GDP-fucose/GDP is localised in a conserved cavity connected to a large solvent exposed pocket, which we show is the binding site of epidermal growth factor (EGF) repeats in the extracellular domain of the Notch Receptor. Through both mutational and kinetic studies we have identified which residues are involved in binding and catalysis and have determined that the Arg240 residue is a key catalytic residue. We also propose a novel S(N)1-like catalytic mechanism with formation of an intimate ion pair, in which the glycosidic bond is cleaved before the nucleophilic attack; and theoretical calculations at a DFT (B3LYP/6-31+G(d,p) support this mechanism. Thus, the crystal structure together with our mutagenesis studies explain the molecular mechanism of POFUT1 and provide a new starting point for the design of functional inhibitors to this critical enzyme in the future.


    Organizational Affiliation

    Institute of Biocomputation and Physics of Complex Systems, University of Zaragoza, Zaragoza, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PUTATIVE GDP-FUCOSE PROTEIN O-FUCOSYLTRANSFERASE 1
A, B
362Caenorhabditis elegansMutation(s): 0 
EC: 2.4.1.221
Find proteins for Q18014 (Caenorhabditis elegans)
Go to UniProtKB:  Q18014
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
A, B
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
GDPKd: 350 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.205 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 132.180α = 90.00
b = 132.180β = 90.00
c = 77.561γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-14
    Type: Initial release
  • Version 1.1: 2011-10-12
    Type: Database references