5AX8

Recombinant expression, purification and preliminary crystallographic studies of the mature form of human mitochondrial aspartate aminotransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.989 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.273 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Recombinant expression, purification and crystallographic studies of the mature form of human mitochondrial aspartate aminotransferase

Jiang, X.Wang, J.Chang, H.Zhou, Y.

(2016) Biosci Trends 10: 79-84

  • DOI: 10.5582/bst.2015.01150

  • PubMed Abstract: 
  • Mitochondrial aspartate aminotransferase (mAspAT) was recognized as a moonlighting enzyme because it has not only aminotransferase activity but also a high-affinity long-chain fatty acids (LCFA) binding site. This enzyme plays a key role in amino aci ...

    Mitochondrial aspartate aminotransferase (mAspAT) was recognized as a moonlighting enzyme because it has not only aminotransferase activity but also a high-affinity long-chain fatty acids (LCFA) binding site. This enzyme plays a key role in amino acid metabolism, biosynthesis of kynurenic acid and transport of the LCFA. Therefore, it is important to study the structure-function relationships of human mAspAT protein. In this work, the mature form of human mAspAT was expressed to a high level in Escherichia coli periplasmic space using pET-22b vector, purified by a combination of immobilized metal-affinity chromatography and cation exchange chromatography. Optimal activity of the enzyme occurred at a temperature of 47.5ºC and a pH of 8.5. Crystals of human mAspAT were grown using the hanging-drop vapour diffusion method at 277K with 0.1 M HEPES pH 6.8 and 25%(v/v) Jeffamine(®) ED-2001 pH 6.8. The crystals diffracted to 2.99 Å and belonged to the space group P1 with the unit-cell parameters a =56.7, b = 76.1, c = 94.2 Å, α =78.0, β =85.6, γ = 78.4º. Elucidation of mAspAT structure can provide a molecular basis towards understanding catalysis mechanism and substrate binding site of enzyme.


    Organizational Affiliation

    School of Life Science and Biotechnology, Dalian University of Technology.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aspartate aminotransferase, mitochondrial
A, B, C, D
407Homo sapiensMutation(s): 1 
Gene Names: GOT2
EC: 2.6.1.1, 2.6.1.7
Find proteins for P00505 (Homo sapiens)
Go to Gene View: GOT2
Go to UniProtKB:  P00505
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.989 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.273 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 56.706α = 78.00
b = 76.140β = 85.65
c = 94.247γ = 78.41
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-03-16
    Type: Initial release
  • Version 1.1: 2016-04-06
    Type: Database references