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: 2.99 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.274 

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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
  • Primary Citation of Related Structures:  
    5AX8

  • 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 acid metabolism, biosynthesis of kynurenic acid and transport of the LCFA ...

    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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aspartate aminotransferase, mitochondrialA, B, C, D407Homo sapiensMutation(s): 1 
Gene Names: GOT2
EC: 2.6.1.1 (PDB Primary Data), 2.6.1.7 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P00505 (Homo sapiens)
Explore P00505 
Go to UniProtKB:  P00505
PHAROS:  P00505
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00505
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.273 
  • R-Value Observed: 0.274 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.706α = 78
b = 76.14β = 85.65
c = 94.247γ = 78.41
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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