4FFF

Crystal Structure of Levan Fructotransferase from Arthrobacter ureafaciens


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.57 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and functional basis for substrate specificity and catalysis of levan fructotransferase.

Park, J.Kim, M.I.Park, Y.D.Shin, I.Cha, J.Kim, C.H.Rhee, S.

(2012) J.Biol.Chem. 287: 31233-31241

  • DOI: 10.1074/jbc.M112.389270
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Levan is β-2,6-linked polymeric fructose and serves as reserve carbohydrate in some plants and microorganisms. Mobilization of fructose is usually mediated by enzymes such as glycoside hydrolase (GH), typically releasing a monosaccharide as a product ...

    Levan is β-2,6-linked polymeric fructose and serves as reserve carbohydrate in some plants and microorganisms. Mobilization of fructose is usually mediated by enzymes such as glycoside hydrolase (GH), typically releasing a monosaccharide as a product. The enzyme levan fructotransferase (LFTase) of the GH32 family catalyzes an intramolecular fructosyl transfer reaction and results in production of cyclic difructose dianhydride, thus exhibiting a novel substrate specificity. The mechanism by which LFTase carries out these functions via the structural fold conserved in the GH32 family is unknown. Here, we report the crystal structure of LFTase from Arthrobacter ureafaciens in apo form, as well as in complexes with sucrose and levanbiose, a difructosacchride with a β-2,6-glycosidic linkage. Despite the similarity of its two-domain structure to members of the GH32 family, LFTase contains an active site that accommodates a difructosaccharide using the -1 and -2 subsites. This feature is unique among GH32 proteins and is facilitated by small side chain residues in the loop region of a catalytic β-propeller N-domain, which is conserved in the LFTase family. An additional oligosaccharide-binding site was also characterized in the β-sandwich C-domain, supporting its role in carbohydrate recognition. Together with functional analysis, our data provide a molecular basis for the catalytic mechanism of LFTase and suggest functional variations from other GH32 family proteins, notwithstanding the conserved structural elements.


    Organizational Affiliation

    Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Levan fructotransferase
A, B, C, D
490Paenarthrobacter ureafaciensMutation(s): 0 
Gene Names: lftA
Find proteins for Q9KJD0 (Paenarthrobacter ureafaciens)
Go to UniProtKB:  Q9KJD0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.57 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 81.958α = 90.00
b = 166.625β = 90.00
c = 261.964γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-06-01 
  • Released Date: 2012-07-18 
  • Deposition Author(s): Park, J., Rhee, S.

Revision History 

  • Version 1.0: 2012-07-18
    Type: Initial release
  • Version 1.1: 2012-08-29
    Type: Database references
  • Version 1.2: 2012-09-26
    Type: Database references