4FLO

Crystal structure of Amylosucrase double mutant A289P-F290C from Neisseria polysaccharea


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.169 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Applying pairwise combinations of amino Acid mutations for sorting out highly efficient glucosylation tools for chemo-enzymatic synthesis of bacterial oligosaccharides.

Champion, E.Guerin, F.Moulis, C.Barbe, S.Tran, T.H.Morel, S.Descroix, K.Monsan, P.Mourey, L.Mulard, L.A.Tranier, S.Remaud-Simeon, M.Andre, I.

(2012) J Am Chem Soc 134: 18677-18688

  • DOI: https://doi.org/10.1021/ja306845b
  • Primary Citation of Related Structures:  
    4FLO, 4FLQ, 4FLR, 4FLS

  • PubMed Abstract: 

    Iterative saturation mutagenesis and combinatorial active site saturation focused on vicinal amino acids were used to alter the acceptor specificity of amylosucrase from Neisseria polysaccharea , a sucrose-utilizing α-transglucosidase, and sort out improved variants. From the screening of three semirational sublibraries accounting in total for 20,000 variants, we report here the isolation of three double mutants of N. polysaccharea amylosucrase displaying a spectacular specificity enhancement toward both sucrose, the donor substrate, and the allyl 2-acetamido-2-deoxy-α-D-glucopyranoside acceptor as compared to the wild-type enzyme. Such levels of activity improvement have never been reported before for this class of carbohydrate-active enzymes. X-ray structure of the best performing enzymes supported by molecular dynamics simulations showed local rigidity of the -1 subsite as well as flexibility of loops involved in active site topology, which both account for the enhanced catalytic performances of the mutants. The study well illustrates the importance of taking into account the local conformation of catalytic residues as well as protein dynamics during the catalytic process, when designing enzyme libraries.


  • Organizational Affiliation

    Université de Toulouse, INSA,UPS,INP, LISBP, Toulouse, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amylosucrase628Neisseria polysacchareaMutation(s): 2 
Gene Names: ams
EC: 2.4.1.4
UniProt
Find proteins for Q9ZEU2 (Neisseria polysaccharea)
Explore Q9ZEU2 
Go to UniProtKB:  Q9ZEU2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ZEU2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.03α = 90
b = 115.98β = 90
c = 60.46γ = 90
Software Package:
Software NamePurpose
DNAdata collection
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-31
    Type: Initial release
  • Version 1.1: 2013-01-02
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description