1AHY

ASPARTATE AMINOTRANSFERASE HEXAMUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Observed: 0.207 

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
  • 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 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ASPARTATE AMINOTRANSFERASEA, B396Escherichia coliMutation(s): 0 
EC: 2.6.1.1
UniProt
Find proteins for P00509 (Escherichia coli (strain K12))
Explore P00509 
Go to UniProtKB:  P00509
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP (Subject of Investigation/LOI)
Query on PLP

Download Ideal Coordinates CCD File 
C [auth A], E [auth B]PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
MAE
Query on MAE

Download Ideal Coordinates CCD File 
D [auth A], F [auth B]MALEIC ACID
C4 H4 O4
VZCYOOQTPOCHFL-UPHRSURJSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
MAE Binding MOAD:  1AHY Kd: 4.40e+5 (nM) from 1 assay(s)
PDBBind:  1AHY Kd: 4.40e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Observed: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.93α = 90
b = 79.09β = 118.7
c = 89.72γ = 90
Software Package:
Software NamePurpose
TNTrefinement
XDSdata reduction

Structure Validation

View Full Validation Report




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