Psychrophilic aromatic amino acids aminotransferase from Psychrobacter sp. B6

Experimental Data Snapshot

  • Resolution: 2.19 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.145 

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This is version 1.3 of the entry. See complete history


Crystal structure and enzymatic properties of a broad substrate-specificity psychrophilic aminotransferase from the Antarctic soil bacterium Psychrobacter sp. B6.

Bujacz, A.Rutkiewicz-Krotewicz, M.Nowakowska-Sapota, K.Turkiewicz, M.

(2015) Acta Crystallogr D Biol Crystallogr 71: 632-645

  • DOI: https://doi.org/10.1107/S1399004714028016
  • Primary Citation of Related Structures:  
    4RKC, 4RKD

  • PubMed Abstract: 

    Aminotransferases (ATs) are enzymes that are commonly used in the chemical and pharmaceutical industries for the synthesis of natural and non-natural amino acids by transamination reactions. Currently, the easily accessible enzymes from mesophilic organisms are most commonly used; however, for economical and ecological reasons the utilization of aminotransferases from psychrophiles would be more advantageous, as their optimum reaction temperature is usually significantly lower than for the mesophilic ATs. Here, gene isolation, protein expression, purification, enzymatic properties and structural studies are reported for the cold-active aromatic amino-acid aminotransferase (PsyArAT) from Psychrobacter sp. B6, a psychrotrophic, Gram-negative strain from Antarctic soil. Preliminary computational analysis indicated dual functionality of the enzyme through the ability to utilize both aromatic amino acids and aspartate as substrates. This postulation was confirmed by enzymatic activity tests, which showed that it belonged to the class EC The first crystal structures of a psychrophilic aromatic amino-acid aminotransferase have been determined at resolutions of 2.19 Å for the native enzyme (PsyArAT) and 2.76 Å for its complex with aspartic acid (PsyArAT/D). Both types of crystals grew in the monoclinic space group P21 under slightly different crystallization conditions. The PsyArAT crystals contained a dimer (90 kDa) in the asymmetric unit, which corresponds to the active form of this enzyme, whereas the crystals of the PsyArAT/D complex included four dimers showing different stages of the transamination reaction.

  • Organizational Affiliation

    Institute of Technical Biochemistry, Lodz University of Technology, Stefanowskiego 4/10, 90-924 Lodz, Poland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aromatic amino acid aminotransferase
A, B
398Psychrobacter sp. B6Mutation(s): 0 
Find proteins for C7E5X4 (Psychrobacter sp. B6)
Explore C7E5X4 
Go to UniProtKB:  C7E5X4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC7E5X4
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PMP

Download Ideal Coordinates CCD File 
K [auth A],
P [auth B]
C8 H13 N2 O5 P
Query on NO3

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
M [auth B],
N [auth B],
O [auth B]
N O3
Query on MG

Download Ideal Coordinates CCD File 
C [auth A],
L [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.19 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.145 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.687α = 90
b = 62.106β = 102.91
c = 85.895γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data 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: 2015-03-11
    Type: Initial release
  • Version 1.1: 2015-03-18
    Changes: Database references
  • Version 1.2: 2018-10-10
    Changes: Data collection, Database references, Structure summary
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary