1GCK

THERMUS THERMOPHILUS ASPARTATE AMINOTRANSFERASE DOUBLE MUTANT 1 COMPLEXED WITH ASPARTATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.217 

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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Substrate recognition mechanism of thermophilic dual-substrate enzyme.

Ura, H.Nakai, T.Kawaguchi, S.I.Miyahara, I.Hirotsu, K.Kuramitsu, S.

(2001) J Biochem 130: 89-98

  • DOI: https://doi.org/10.1093/oxfordjournals.jbchem.a002966
  • Primary Citation of Related Structures:  
    1B5O, 1B5P, 1GC3, 1GC4, 1GCK, 5BJ3, 5BJ4

  • PubMed Abstract: 

    Aspartate aminotransferase from an extremely thermophilic bacterium, Thermus thermophilus HB8 (ttAspAT), has been believed to be specific for an acidic substrate. However, stepwise introduction of mutations in the active-site residues finally changed its substrate specificity to that of a dual-substrate enzyme. The final mutant, [S15D, T17V, K109S, S292R] ttAspAT, is active toward both acidic and hydrophobic substrates. During the course of stepwise mutation, the activities toward acidic and hydrophobic substrates changed independently. The introduction of a mobile Arg292* residue into ttAspAT was the key step in the change to a "dual-substrate" enzyme. The substrate recognition mechanism of this thermostable "dual-substrate" enzyme was confirmed by X-ray crystallography. This work together with previous studies on various enzymes suggest that this unique "dual-substrate recognition" mechanism is a feature of not only aminotransferases but also other enzymes.


  • Organizational Affiliation

    Department of Biology, Graduate School of Science, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ASPARTATE AMINOTRANSFERASE
A, B
385Thermus thermophilus HB8Mutation(s): 2 
EC: 2.6.1.1
UniProt
Find proteins for Q56232 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q56232 
Go to UniProtKB:  Q56232
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56232
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.75α = 90
b = 74.89β = 90
c = 163.9γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
X-PLORrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-11-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2019-10-16
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-12-27
    Changes: Data collection