3TL6

Crystal structure of purine nucleoside phosphorylase from Entamoeba histolytica


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Expression of proteins in Escherichia coli as fusions with maltose-binding protein to rescue non-expressed targets in a high-throughput protein-expression and purification pipeline.

Hewitt, S.N.Choi, R.Kelley, A.Crowther, G.J.Napuli, A.J.Van Voorhis, W.C.

(2011) Acta Crystallogr Sect F Struct Biol Cryst Commun 67: 1006-1009

  • DOI: 10.1107/S1744309111022159
  • Primary Citation of Related Structures:  
    3SDS, 3TL6, 3U40

  • PubMed Abstract: 
  • Despite recent advances, the expression of heterologous proteins in Escherichia coli for crystallization remains a nontrivial challenge. The present study investigates the efficacy of maltose-binding protein (MBP) fusion as a general strategy for rescuing the expression of target proteins ...

    Despite recent advances, the expression of heterologous proteins in Escherichia coli for crystallization remains a nontrivial challenge. The present study investigates the efficacy of maltose-binding protein (MBP) fusion as a general strategy for rescuing the expression of target proteins. From a group of sequence-verified clones with undetectable levels of protein expression in an E. coli T7 expression system, 95 clones representing 16 phylogenetically diverse organisms were selected for recloning into a chimeric expression vector with an N-terminal histidine-tagged MBP. PCR-amplified inserts were annealed into an identical ligation-independent cloning region in an MBP-fusion vector and were analyzed for expression and solubility by high-throughput nickel-affinity binding. This approach yielded detectable expression of 72% of the clones; soluble expression was visible in 62%. However, the solubility of most proteins was marginal to poor upon cleavage of the MBP tag. This study offers large-scale evidence that MBP can improve the soluble expression of previously non-expressing proteins from a variety of eukaryotic and prokaryotic organisms. While the behavior of the cleaved proteins was disappointing, further refinements in MBP tagging may permit the more widespread use of MBP-fusion proteins in crystallographic studies.


    Organizational Affiliation

    Seattle Structural Genomics Center for Infectious Disease (SSGCID), University of Washington, WA 98195, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Purine nucleoside phosphorylase
A, B, C, D, E, F
A, B, C, D, E, F
242Entamoeba histolyticaMutation(s): 0 
Gene Names: EHI_130960
EC: 2.4.2.1
UniProt
Find proteins for C4LXG4 (Entamoeba histolytica (strain ATCC 30459 / HM-1:IMSS / ABRM))
Explore C4LXG4 
Go to UniProtKB:  C4LXG4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC4LXG4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: P 1 21 1
  • Diffraction Data DOI: 10.18430/M33TL6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.97α = 90
b = 86.56β = 117.88
c = 102.56γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-07
    Type: Initial release
  • Version 1.1: 2011-09-21
    Changes: Database references