The crystal structure of Halomonas elongata amino-transferase

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 

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Widely applicable background depletion step enables transaminase evolution through solid-phase screening.

Planchestainer, M.Hegarty, E.Heckmann, C.M.Gourlay, L.J.Paradisi, F.

(2019) Chem Sci 10: 5952-5958

  • DOI: https://doi.org/10.1039/c8sc05712e
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Directed evolution of transaminases is a widespread technique in the development of highly sought-after biocatalysts for industrial applications. This process, however, is challenged by the limited availability of effective high-throughput protocols to evaluate mutant libraries. Here we report a rapid, reliable, and widely applicable background depletion method for solid-phase screening of transaminase variants, which was successfully applied to a transaminase from Halomonas elongata (HEWT), evolved through rounds of random mutagenesis towards a series of diverse prochiral ketones. This approach enabled the identification of transaminase variants in viable cells with significantly improved activity towards para-substituted acetophenones (up to 60-fold), as well as tetrahydrothiophen-3-one and related substrates. Rationalisation of the mutants was assisted by determination of the high-resolution wild-type HEWT crystal structure presented herein.

  • Organizational Affiliation

    University of Nottingham , School of Chemistry , University Park , Nottingham NG7 2RD , United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putrescine aminotransferase
A, B
462Halomonas elongata DSM 2581Mutation(s): 0 
Gene Names: spuCHELO_1904
EC: 2.6.1
Find proteins for E1V913 (Halomonas elongata (strain ATCC 33173 / DSM 2581 / NBRC 15536 / NCIMB 2198 / 1H9))
Explore E1V913 
Go to UniProtKB:  E1V913
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE1V913
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.344α = 83.45
b = 61.875β = 82.58
c = 67.475γ = 72.52
Software Package:
Software NamePurpose
X-Areadata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-08
    Type: Initial release
  • Version 1.1: 2019-08-14
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-15
    Changes: Data collection