4F7R

Crystal structure of 14-3-3 protein from Giardia intestinalis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Crystal Structure of Giardia duodenalis 14-3-3 in the Apo Form: When Protein Post-Translational Modifications Make the Difference.

Fiorillo, A.di Marino, D.Bertuccini, L.Via, A.Pozio, E.Camerini, S.Ilari, A.Lalle, M.

(2014) Plos One 9: e92902-e92902

  • DOI: 10.1371/journal.pone.0092902
  • Also Cited By: 4ZQ0

  • PubMed Abstract: 
  • The 14-3-3s are a family of dimeric evolutionary conserved pSer/pThr binding proteins that play a key role in multiple biological processes by interacting with a plethora of client proteins. Giardia duodenalis is a flagellated protozoan that affects ...

    The 14-3-3s are a family of dimeric evolutionary conserved pSer/pThr binding proteins that play a key role in multiple biological processes by interacting with a plethora of client proteins. Giardia duodenalis is a flagellated protozoan that affects millions of people worldwide causing an acute and chronic diarrheal disease. The single giardial 14-3-3 isoform (g14-3-3), unique in the 14-3-3 family, needs the constitutive phosphorylation of Thr214 and the polyglycylation of its C-terminus to be fully functional in vivo. Alteration of the phosphorylation and polyglycylation status affects the parasite differentiation into the cyst stage. To further investigate the role of these post-translational modifications, the crystal structure of the g14-3-3 was solved in the unmodified apo form. Oligomers of g14-3-3 were observed due to domain swapping events at the protein C-terminus. The formation of filaments was supported by TEM. Mutational analysis, in combination with native PAGE and chemical cross-linking, proved that polyglycylation prevents oligomerization. In silico phosphorylation and molecular dynamics simulations supported a structural role for the phosphorylation of Thr214 in promoting target binding. Our findings highlight unique structural features of g14-3-3 opening novel perspectives on the evolutionary history of this protein family and envisaging the possibility to develop anti-giardial drugs targeting g14-3-3.


    Organizational Affiliation

    Department of Biochemical Sciences "A. Rossi-Fanelli", University of Rome "Sapienza", Rome, Italy; Institute of Molecular Biology and Pathology, CNR, Rome, Italy and Institute Pasteur Cenci-Bolognetti Foundation at Department of Biochemical Sciences "A. Rossi-Fanelli", University of Rome "Sapienza", Rome, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14-3-3 protein
A, B, C, D
253Giardia intestinalisMutation(s): 0 
Find proteins for Q2QBT8 (Giardia intestinalis)
Go to UniProtKB:  Q2QBT8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.185 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 100.879α = 90.00
b = 100.879β = 90.00
c = 140.559γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-22
    Type: Initial release
  • Version 1.1: 2014-04-16
    Type: Database references
  • Version 1.2: 2015-04-01
    Type: Structure summary