3AL7

Recombinant thaumatin I at 1.1 A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.10 Å
  • R-Value Free: 0.135 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

High-resolution structure of the recombinant sweet-tasting protein thaumatin I

Masuda, T.Ohta, K.Mikami, B.Kitabatake, N.

(2011) Acta Crystallogr Sect F Struct Biol Cryst Commun 67: 652-658

  • DOI: https://doi.org/10.1107/S174430911101373X
  • Primary Citation of Related Structures:  
    3AL7, 3ALD

  • PubMed Abstract: 

    Thaumatin, an intensely sweet-tasting plant protein, elicits a sweet taste at a concentration of 50 nM. The crystal structure of a recombinant form of thaumatin I produced in the yeast Pichia pastoris has been determined to a resolution of 1.1 Å. The model was refined with anisotropic B parameters and riding H atoms. A comparison of the diffraction data and refinement statistics for recombinant thaumatin I with those for plant thaumatin I revealed no significant differences in the diffraction data. The R values for recombinant thaumatin I and plant thaumatin I (F(o) > 4σ) were 9.11% and 9.91%, respectively, indicating the final model to be of good quality. Notably, the electron-density maps around Asn46 and Ser63, which differ between thaumatin variants, were significantly improved. Furthermore, a number of H atoms became visible in an OMIT map and could be assigned. The high-quality structure of recombinant thaumatin with H atoms should provide details about sweetness determinants in thaumatin and provide valuable insights into the mechanism of its interaction with taste receptors.


  • Organizational Affiliation

    Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto, Japan. t2masuda@kais.kyoto-u.ac.jp


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thaumatin I207Thaumatococcus danielliiMutation(s): 0 
UniProt
Find proteins for P02883 (Thaumatococcus daniellii)
Explore P02883 
Go to UniProtKB:  P02883
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02883
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.10 Å
  • R-Value Free: 0.135 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.699α = 90
b = 57.699β = 90
c = 149.776γ = 90
Software Package:
Software NamePurpose
SHELXmodel building
SHELXL-97refinement
HKL-2000data reduction
HKL-2000data scaling
SHELXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-06-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-11-02
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description