Stationary phase Survival protein E (SurE) from Xylella fastidiosa- XfSurE-TSAmp (Tetramer Smaller - crystallization with 3'AMP).

Experimental Data Snapshot

  • Resolution: 2.76 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Conformational variability of the stationary phase survival protein E from Xylella fastidiosa revealed by X-ray crystallography, small-angle X-ray scattering studies, and normal mode analysis.

Machado, A.T.P.Fonseca, E.M.B.Reis, M.A.D.Saraiva, A.M.Santos, C.A.D.de Toledo, M.A.S.Polikarpov, I.de Souza, A.P.Aparicio, R.Iulek, J.

(2017) Proteins 85: 1931-1943

  • DOI: https://doi.org/10.1002/prot.25347
  • Primary Citation of Related Structures:  
    5KSQ, 5KSR, 5KSS, 5KST

  • PubMed Abstract: 

    Xylella fastidiosa is a xylem-limited bacterium that infects a wide variety of plants. Stationary phase survival protein E is classified as a nucleotidase, which is expressed when bacterial cells are in the stationary growth phase and subjected to environmental stresses. Here, we report four refined X-ray structures of this protein from X. fastidiosa in four different crystal forms in the presence and/or absence of the substrate 3'-AMP. In all chains, the conserved loop verified in family members assumes a closed conformation in either condition. Therefore, the enzymatic mechanism for the target protein might be different of its homologs. Two crystal forms exhibit two monomers whereas the other two show four monomers in the asymmetric unit. While the biological unit has been characterized as a tetramer, differences of their sizes and symmetry are remarkable. Four conformers identified by Small-Angle X-ray Scattering (SAXS) in a ligand-free solution are related to the low frequency normal modes of the crystallographic structures associated with rigid body-like protomer arrangements responsible for the longitudinal and symmetric adjustments between tetramers. When the substrate is present in solution, only two conformers are selected. The most prominent conformer for each case is associated to a normal mode able to elongate the protein by moving apart two dimers. To our knowledge, this work was the first investigation based on the normal modes that analyzed the quaternary structure variability for an enzyme of the SurE family followed by crystallography and SAXS validation. The combined results raise new directions to study allosteric features of XfSurE protein.

  • Organizational Affiliation

    Department of Chemistry, State University of Ponta Grossa, Brazil.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
5'-nucleotidase SurE
A, B, C, D
270Xylella fastidiosa 9a5cMutation(s): 0 
Gene Names: surEXF_0858
Find proteins for Q9PF20 (Xylella fastidiosa (strain 9a5c))
Explore Q9PF20 
Go to UniProtKB:  Q9PF20
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9PF20
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IOD

Download Ideal Coordinates CCD File 
F [auth A]
H [auth A]
I [auth B]
M [auth C]
O [auth D]
F [auth A],
H [auth A],
I [auth B],
M [auth C],
O [auth D],
Q [auth D]
Query on PO4

Download Ideal Coordinates CCD File 
G [auth A],
K [auth B],
N [auth C],
R [auth D]
O4 P
Query on MN

Download Ideal Coordinates CCD File 
E [auth A],
J [auth B],
L [auth C],
P [auth D]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.76 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 157.001α = 90
b = 78.209β = 96.74
c = 82.158γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)Brazil140377/2008-5

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-19
    Type: Initial release
  • Version 1.1: 2017-08-02
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Database references
  • Version 1.3: 2023-10-04
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description