Crystal structure of the MUTB F164L mutant from crystals soaked with Trehalulose

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

Starting Model: experimental
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Mutations inducing an active-site aperture in Rhizobium sp. sucrose isomerase confer hydrolytic activity

Lipski, A.Watzlawick, H.Ravaud, S.Robert, X.Rhimi, M.Haser, R.Mattes, R.Aghajari, N.

(2013) Acta Crystallogr D Biol Crystallogr 69: 298-307

  • DOI: https://doi.org/10.1107/S0907444912045532
  • Primary Citation of Related Structures:  
    4GI6, 4GI8, 4GI9, 4GIA, 4GIN, 4H2C

  • PubMed Abstract: 

    Sucrose isomerase is an enzyme that catalyzes the production of sucrose isomers of high biotechnological and pharmaceutical interest. Owing to the complexity of the chemical synthesis of these isomers, isomaltulose and trehalulose, enzymatic conversion remains the preferred method for obtaining these products. Depending on the microbial source, the ratio of the sucrose-isomer products varies significantly. In studies aimed at understanding and explaining the underlying molecular mechanisms of these reactions, mutations obtained using a random-mutagenesis approach displayed a major hydrolytic activity. Two of these variants, R284C and F164L, of sucrose isomerase from Rhizobium sp. were therefore crystallized and their crystal structures were determined. The three-dimensional structures of these mutants allowed the identification of the molecular determinants that favour hydrolytic activity compared with transferase activity. Substantial conformational changes resulting in an active-site opening were observed, as were changes in the pattern of water molecules bordering the active-site region.

  • Organizational Affiliation

    Laboratory for Biocrystallography and Structural Biology of Therapeutic Targets, Molecular and Structural Bases of Infectious Diseases, UMR 5086 CNRS and University of Lyon, 7 Passage du Vercors, F-69367 Lyon CEDEX 07, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sucrose isomerase
A, B
557Rhizobium sp. MX-45Mutation(s): 1 
Gene Names: mutB
Find proteins for M1E1F3 (Rhizobium sp. MX-45)
Explore M1E1F3 
Go to UniProtKB:  M1E1F3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupM1E1F3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.9α = 90
b = 85.93β = 97.92
c = 118.72γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-13
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description