3ZY4

Crystal structure of POFUT1 apo-form (crystal-form-I)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.235 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


This is version 1.3 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: https://doi.org/10.1371/journal.pone.0025365
  • Primary Citation of Related Structures:  
    3ZY2, 3ZY3, 3ZY4, 3ZY5, 3ZY6

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PUTATIVE GDP-FUCOSE PROTEIN O-FUCOSYLTRANSFERASE 1362Caenorhabditis elegansMutation(s): 0 
EC: 2.4.1.221
UniProt
Find proteins for Q18014 (Caenorhabditis elegans)
Explore Q18014 
Go to UniProtKB:  Q18014
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ18014
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.235 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.44α = 90
b = 42.533β = 107.24
c = 96.924γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-14
    Type: Initial release
  • Version 1.1: 2011-10-12
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description
  • Version 1.3: 2024-10-16
    Changes: Structure summary