Crystal structure of Triosephosphate Isomerase from Zea mays (mexican corn)

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.148 

Starting Model: experimental
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Structure and conformational stability of the triosephosphate isomerase from Zea mays. Comparison with the chemical unfolding pathways of other eukaryotic TIMs.

Romero-Romero, S.Becerril-Sesin, L.A.Costas, M.Rodriguez-Romero, A.Fernandez-Velasco, D.A.

(2018) Arch Biochem Biophys 658: 66-76

  • DOI: https://doi.org/10.1016/j.abb.2018.09.022
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We studied the structure, function and thermodynamic properties for the unfolding of the Triosephosphate isomerase (TIM) from Zea mays (ZmTIM). ZmTIM shows a catalytic efficiency close to the diffusion limit. Native ZmTIM is a dimer that dissociates upon dilution into inactive and unfolded monomers. Its thermal unfolding is irreversible with a T m of 61.6 ± 1.4 °C and an activation energy of 383.4 ± 11.5 kJ mol -1 . The urea-induced unfolding of ZmTIM is reversible. Transitions followed by catalytic activity and spectroscopic properties are monophasic and superimposable, indicating that ZmTIM unfolds/refolds in a two-state behavior with an unfolding ΔG° (H20)  = 99.8 ± 5.3 kJ mol -1 . This contrasts with most other studied TIMs, where folding intermediates are common. The three-dimensional structure of ZmTIM was solved at 1.8 Å. A structural comparison with other eukaryotic TIMs shows a similar number of intramolecular and intermolecular interactions. Interestingly the number of interfacial water molecules found in ZmTIM is lower than those observed in most TIMs that show folding intermediates. Although with the available data, there is no clear correlation between structural properties and the number of equilibrium intermediates in the unfolding of TIM, the identification of such structural properties should increase our understanding of folding mechanisms.

  • Organizational Affiliation

    Laboratorio de Fisicoquímica e Ingeniería de Proteínas, Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, Mexico.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Triosephosphate isomerase, cytosolic
A, B
256Zea maysMutation(s): 0 
Find proteins for P12863 (Zea mays)
Explore P12863 
Go to UniProtKB:  P12863
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP12863
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.148 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.43α = 90
b = 49.4β = 92.23
c = 74.6γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Consejo Nacional de Ciencia y Tecnologia (CONACYT)Mexico254514
Consejo Nacional de Ciencia y Tecnologia (CONACYT)Mexico221169

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2018-10-17
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2020-01-15
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description