3WPY

Microbacterium saccharophilum K-1 beta-fructofuranosidase mutant T47S/S200T/F447V/P500S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Enhancing thermostability and the structural characterization of Microbacterium saccharophilum K-1 beta-fructofuranosidase

Ohta, Y.Hatada, Y.Hidaka, Y.Shimane, Y.Usui, K.Ito, T.Fujita, K.Yokoi, G.Mori, M.Sato, S.Miyazaki, T.Nishikawa, A.Tonozuka, T.

(2014) Appl.Microbiol.Biotechnol. 98: 6667-6677

  • DOI: 10.1007/s00253-014-5645-3
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • A β-fructofuranosidase from Microbacterium saccharophilum K-1 (formerly known as Arthrobacter sp. K-1) is useful for producing the sweetener lactosucrose (4(G)-β-D-galactosylsucrose). Thermostability of the β-fructofuranosidase was enhanced by random ...

    A β-fructofuranosidase from Microbacterium saccharophilum K-1 (formerly known as Arthrobacter sp. K-1) is useful for producing the sweetener lactosucrose (4(G)-β-D-galactosylsucrose). Thermostability of the β-fructofuranosidase was enhanced by random mutagenesis and saturation mutagenesis. Clones with enhanced thermostability included mutations at residues Thr47, Ser200, Phe447, Phe470, and Pro500. In the highest stability mutant, T47S/S200T/F447P/F470Y/P500S, the half-life at 60 °C was 182 min, 16.5-fold longer than the wild-type enzyme. A comparison of the crystal structures of the full-length wild-type enzyme and three mutants showed that various mechanisms appear to be involved in thermostability enhancement. In particular, the replacement of Phe447 with Val or Pro induced a conformational change in an adjacent residue His477, which results in the formation of a new hydrogen bond in the enzyme. Although the thermostabilization mechanisms of the five residue mutations were explicable on the basis of the crystal structures, it appears to be difficult to predict which amino acid residues should be modified to obtain thermostabilized enzymes.


    Organizational Affiliation

    Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka, Kanagawa, 237-0061, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-fructofuranosidase
A, B, C
542Microbacterium saccharophilumMutation(s): 4 
Gene Names: bff
Find proteins for Q8VW87 (Microbacterium saccharophilum)
Go to UniProtKB:  Q8VW87
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.193 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 57.238α = 66.85
b = 81.714β = 87.11
c = 90.962γ = 88.48
Software Package:
Software NamePurpose
REFMACrefinement
MOLREPphasing
HKL-2000data collection
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-12
    Type: Initial release
  • Version 1.1: 2014-08-06
    Type: Database references