Crystal structure of F16BP Aldolase from Toxoplasma gondii (TgALD1)

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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Structural and Functional Divergence of the Aldolase Fold in Toxoplasma Gondii.

Tonkin, M.L.Halavaty, A.S.Ramaswamy, R.Ruan, J.Igarashi, M.Ngo, H.M.Boulanger, M.J.

(2015) J Mol Biol 427: 840

  • DOI: https://doi.org/10.1016/j.jmb.2014.09.019
  • Primary Citation of Related Structures:  
    3QYQ, 4D2J, 4EIV

  • PubMed Abstract: 

    Parasites of the phylum Apicomplexa are highly successful pathogens of humans and animals worldwide. As obligate intracellular parasites, they have significant energy requirements for invasion and gliding motility that are supplied by various metabolic pathways. Aldolases have emerged as key enzymes involved in these pathways, and all apicomplexans express one or both of fructose 1,6-bisphosphate (F16BP) aldolase and 2-deoxyribose 5-phosphate (dR5P) aldolase (DERA). Intriguingly, Toxoplasma gondii, a highly successful apicomplexan parasite, expresses F16BP aldolase (TgALD1), d5RP aldolase (TgDERA), and a divergent dR5P aldolase-like protein (TgDPA) exclusively in the latent bradyzoite stage. While the importance of TgALD1 in glycolysis is well established and TgDERA is also likely to be involved in parasite metabolism, the detailed function of TgDPA remains elusive. To gain mechanistic insight into the function of different T. gondii aldolases, we first determined the crystal structures of TgALD1 and TgDPA. Structural analysis revealed that both aldolases adopt a TIM barrel fold accessorized with divergent secondary structure elements. Structural comparison of TgALD1 and TgDPA with members of their respective enzyme families revealed that, while the active-site residues are conserved in TgALD1, key catalytic residues are absent in TgDPA. Consistent with this observation, biochemical assays showed that, while TgALD1 was active on F16BP, TgDPA was inactive on dR5P. Intriguingly, both aldolases are competent to bind polymerized actin in vitro. Altogether, structural and biochemical analyses of T. gondii aldolase and aldolase-like proteins reveal diverse functionalization of the classic TIM barrel aldolase fold.

  • Organizational Affiliation

    Center for Structural Genomics of Infectious Diseases, Department of Biochemistry and Molecular Genetics, Northwestern University, 303 East Chicago Avenue, Chicago, IL 60611, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FRUCTOSE-BISPHOSPHATE ALDOLASE353Toxoplasma gondiiMutation(s): 0 
Find proteins for B9PW35 (Toxoplasma gondii (strain ATCC 50861 / VEG))
Explore B9PW35 
Go to UniProtKB:  B9PW35
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB9PW35
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.814α = 90
b = 109.814β = 90
c = 54.357γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2015-03-04
    Changes: Database references