1AHX

ASPARTATE AMINOTRANSFERASE HEXAMUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Observed: 0.226 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 10.1038/nsb0795-548
  • Structures With Same Primary Citation

  • 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 ...

    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.


    Related Citations: 
    • Redesign of Aspartate Aminotransferase Specificity to that of Tyrosine Aminotransferase
      Kirsch, J.F., Onuffer, J.J.
      (1994) Biochemistry Of Vitamin B6 And Pqq --: 37

    Organizational Affiliation

    Department of Structural Biology, University of Basel, Switzerland.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ASPARTATE AMINOTRANSFERASE
A, B
396Escherichia coliMutation(s): 0 
EC: 2.6.1.1
Find proteins for P00509 (Escherichia coli (strain K12))
Go to UniProtKB:  P00509
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP

Download CCD File 
A, B
PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
HCI
Query on HCI

Download CCD File 
A, B
HYDROCINNAMIC ACID
C9 H10 O2
XMIIGOLPHOKFCH-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
HCIKd:  120000   nM  Binding MOAD
HCIKd :  120000   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Observed: 0.226 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.98α = 90
b = 78.69β = 118.32
c = 89.28γ = 90
Software Package:
Software NamePurpose
TNTrefinement
XDSdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • 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