6GKR

Crystal structure of branched-chain amino acid aminotransferase from Thermobaculum terrenum in PLP-form (holo-form)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.162 

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This is version 1.3 of the entry. See complete history


Literature

Biochemical and structural insights into PLP fold type IV transaminase from Thermobaculum terrenum.

Bezsudnova, E.Y.Boyko, K.M.Nikolaeva, A.Y.Zeifman, Y.S.Rakitina, T.V.Suplatov, D.A.Popov, V.O.

(2018) Biochimie 158: 130-138

  • DOI: 10.1016/j.biochi.2018.12.017
  • Primary Citation of Related Structures:  
    6GKR, 6Q8E

  • PubMed Abstract: 
  • The high catalytic efficiency of enzymes under reaction conditions is one of the main goals in biocatalysis. Despite the dramatic progress in the development of more efficient biocatalysts by protein design, the search for natural enzymes with useful properties remains a promising strategy ...

    The high catalytic efficiency of enzymes under reaction conditions is one of the main goals in biocatalysis. Despite the dramatic progress in the development of more efficient biocatalysts by protein design, the search for natural enzymes with useful properties remains a promising strategy. The pyridoxal 5'-phosphate (PLP)-dependent transaminases represent a group of industrially important enzymes due to their ability to stereoselectively transfer amino groups between diverse substrates; however, the complex mechanism of substrate recognition and conversion makes the design of transaminases a challenging task. Here we report a detailed structural and kinetic study of thermostable transaminase from the bacterium Thermobaculum terrenum (TaTT) using the methods of enzyme kinetics, X-ray crystallography and molecular modeling. TaTT can convert L-branched-chain and L-aromatic amino acids as well as (R)-(+)-1-phenylethylamine at a high rate and with high enantioselectivity. The structures of TaTT in complex with the cofactor pyridoxal 5'-phosphate covalently bound to enzyme and in complex with its reduced form, pyridoxamine 5'-phosphate, were determined at resolutions of 2.19 Å and 1.5 Å, and deposited in the Protein Data Bank as entries 6GKR and 6Q8E, respectively. TaTT is a fold type IV PLP-dependent enzyme. In terms of structural similarity, the enzyme is close to known branched-chain amino acid aminotransferases, but differences in characteristic sequence motifs in the active site were observed in TaTT compared to canonical branched-chain amino acid aminotransferases, which can explain the improved binding of aromatic amino acids and (R)-(+)-1-phenylethylamine. This study has shown for the first time that high substrate specificity towards both various l-amino acids and (R)-primary amines can be implemented within one pyridoxal 5'-phosphate-dependent active site of fold type IV. These results complement our knowledge of the catalytic diversity of transaminases and indicate the need for further biochemical and bioinformatic studies to understand the sequence-structure-function relationship in these enzymes.


    Organizational Affiliation

    Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave. 33, Bld. 2, 119071, Moscow, Russian Federation; Kurchatov Complex of NBICS-technologies, National Research Centre "Kurchatov Institute", Akad. Kurchatova Sqr 1, 123182, Moscow, Russian Federation.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Branched-chain-amino-acid aminotransferaseA, B, C316Thermobaculum terrenum ATCC BAA-798Mutation(s): 0 
Gene Names: ilvETter_1720
EC: 2.6.1.42
UniProt
Find proteins for D1CCW1 (Thermobaculum terrenum (strain ATCC BAA-798 / YNP1))
Explore D1CCW1 
Go to UniProtKB:  D1CCW1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD1CCW1
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.162 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.509α = 90
b = 146.61β = 90
c = 119.57γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Russian Science FoundationRussian Federation14-24-00172

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2018-11-14
    Changes: Data collection, Refinement description
  • Version 1.2: 2019-01-16
    Changes: Data collection, Database references
  • Version 1.3: 2019-01-23
    Changes: Data collection, Database references