2.75 Angstrom Crystal Structure of Enolase 1 from Toxoplasma gondii

Experimental Data Snapshot

  • Resolution: 2.75 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

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The structure of bradyzoite-specific enolase from Toxoplasma gondii reveals insights into its dual cytoplasmic and nuclear functions.

Ruan, J.Mouveaux, T.Light, S.H.Minasov, G.Anderson, W.F.Tomavo, S.Ngo, H.M.

(2015) Acta Crystallogr D Biol Crystallogr 71: 417-426

  • DOI: https://doi.org/10.1107/S1399004714026479
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In addition to catalyzing a central step in glycolysis, enolase assumes a remarkably diverse set of secondary functions in different organisms, including transcription regulation as documented for the oncogene c-Myc promoter-binding protein 1. The apicomplexan parasite Toxoplasma gondii differentially expresses two nuclear-localized, plant-like enolases: enolase 1 (TgENO1) in the latent bradyzoite cyst stage and enolase 2 (TgENO2) in the rapidly replicative tachyzoite stage. A 2.75 Å resolution crystal structure of bradyzoite enolase 1, the second structure to be reported of a bradyzoite-specific protein in Toxoplasma, captures an open conformational state and reveals that distinctive plant-like insertions are located on surface loops. The enolase 1 structure reveals that a unique residue, Glu164, in catalytic loop 2 may account for the lower activity of this cyst-stage isozyme. Recombinant TgENO1 specifically binds to a TTTTCT DNA motif present in the cyst matrix antigen 1 (TgMAG1) gene promoter as demonstrated by gel retardation. Furthermore, direct physical interactions of both nuclear TgENO1 and TgENO2 with the TgMAG1 gene promoter are demonstrated in vivo using chromatin immunoprecipitation (ChIP) assays. Structural and biochemical studies reveal that T. gondii enolase functions are multifaceted, including the coordination of gene regulation in parasitic stage development. Enolase 1 provides a potential lead in the design of drugs against Toxoplasma brain cysts.

  • Organizational Affiliation

    Center for Structural Genomics of Infectious Diseases, Northwestern University, 320 E. Superior Street, Morton 7-601, Chicago, IL 60611, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F
452Toxoplasma gondii ME49Mutation(s): 0 
Gene Names: TGME49_068860
Find proteins for B9PH47 (Toxoplasma gondii (strain ATCC 50861 / VEG))
Explore B9PH47 
Go to UniProtKB:  B9PH47
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB9PH47
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.75 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 
  • Space Group: I 4
  • Diffraction Data: https://doi.org/10.18430/M33OTR
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 323.632α = 90
b = 323.632β = 90
c = 66.773γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2010-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2015-03-18
    Changes: Database references
  • Version 1.3: 2017-11-08
    Changes: Refinement description
  • Version 1.4: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description