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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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
  • 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
Find similar proteins by:  (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