Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Observed: 0.250 

wwPDB Validation   3D Report Full Report

This is version 2.1 of the entry. See complete history


Alternating arginine-modulated substrate specificity in an engineered tyrosine aminotransferase.

Malashkevich, V.N.Onuffer, J.J.Kirsch, J.F.Jansonius, J.N.

(1995) Nat Struct Biol 2: 548-553

  • DOI: https://doi.org/10.1038/nsb0795-548
  • Primary Citation of Related Structures:  
    1AHE, 1AHF, 1AHG, 1AHX, 1AHY

  • PubMed Abstract: 

    Mutation of six residues of Escherichia coli aspartate aminotransferase results in substantial acquisition of the transamination properties of tyrosine amino-transferase without loss of aspartate transaminase activity. X-ray crystallographic analysis of key inhibitor complexes of the hexamutant reveals the structural basis for this substrate selectivity. It appears that tyrosine aminotransferase achieves nearly equal affinities for a wide range of amino acids by an unusual conformational switch. An active-site arginine residue either shifts its position to electrostatically interact with charged substrates or moves aside to allow access of aromatic ligands.

  • Organizational Affiliation

    Department of Structural Biology, University of Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate aminotransferase
A, B
396Escherichia coli K-12Mutation(s): 6 
Gene Names: aspCb0928JW0911
Find proteins for P00509 (Escherichia coli (strain K12))
Explore P00509 
Go to UniProtKB:  P00509
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00509
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Observed: 0.250 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86α = 90
b = 79.1β = 118.67
c = 89.6γ = 90
Software Package:
Software NamePurpose
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-09-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Other
  • Version 2.0: 2018-02-21
    Changes: Advisory, Atomic model, Database references, Derived calculations, Polymer sequence, Source and taxonomy, Structure summary
  • Version 2.1: 2024-02-07
    Changes: Data collection, Database references, Derived calculations