2XSK

E. coli curli protein CsgC - SeCys


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Extending the Usability of the Phasing Power of Diselenide Bonds: Secys Sad Phasing of Csgc Using a Non-Auxotrophic Strain.

Salgado, P.S.Taylor, J.D.Cota, E.Matthews, S.J.

(2011) Acta Crystallogr.,Sect.D 67: 8

  • DOI: 10.1107/S0907444910042022

  • PubMed Abstract: 
  • The CsgC protein is a component of the curli system in Escherichia coli. Reported here is the successful incorporation of selenocysteine (SeCys) and selenomethionine (SeMet) into recombinant CsgC, yielding derivatized crystals suitable for structural ...

    The CsgC protein is a component of the curli system in Escherichia coli. Reported here is the successful incorporation of selenocysteine (SeCys) and selenomethionine (SeMet) into recombinant CsgC, yielding derivatized crystals suitable for structural determination. Unlike in previous reports, a standard autotrophic expression strain was used and only single-wavelength anomalous dispersion (SAD) data were required for successful phasing. The level of SeCys/SeMet incorporation was estimated by mass spectrometry to be about 80%. The native protein crystallized in two different crystal forms (form 1 belonging to space group C222(1) and form 2 belonging to space group C2), which diffracted to 2.4 and 2.0 Å resolution, respectively, whilst Se-derivatized protein crystallized in space group C2 and diffracted to 1.7 Å resolution. The Se-derivatized crystals are suitable for SAD structure determination using only the anomalous signal derived from the SeCys residues. These results extend the usability of SeCys labelling to more general and less favourable cases, rendering it a suitable alternative to traditional phasing approaches.


    Organizational Affiliation

    Imperial College London, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CSGC
A
110Escherichia coliMutation(s): 0 
Gene Names: csgC
Find proteins for B2CY50 (Escherichia coli)
Go to UniProtKB:  B2CY50
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
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.237 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 79.270α = 90.00
b = 36.150β = 117.09
c = 39.510γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
XDSdata reduction
XDSdata scaling
SHELXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-29
    Type: Initial release
  • Version 1.1: 2012-05-30
    Type: Database references, Version format compliance
  • Version 1.2: 2014-01-29
    Type: Atomic model, Derived calculations, Non-polymer description, Other, Structure summary