X-ray structure of homo sapiens Fumarylacetoacetate hydrolase domain containing protein 1 (FAHD1) at 1.56A resolution.

  • Classification: HYDROLASE/LYASE
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2018-02-07 Released: 2018-11-07 
  • Deposition Author(s): Naschberger, A., Weiss, A.K.H.
  • Funding Organization(s): European integrated FP6-LIFESCIHEALTH project MiMAGE, Austria Wirtschaftsservice Gesellschaft (AWS), Austrian Science Fund

Experimental Data Snapshot

  • Resolution: 1.56 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 

wwPDB Validation   3D Report Full Report

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Structural basis for the bi-functionality of human oxaloacetate decarboxylase FAHD1.

Weiss, A.K.H.Naschberger, A.Loeffler, J.R.Gstach, H.Bowler, M.W.Holzknecht, M.Cappuccio, E.Pittl, A.Etemad, S.Dunzendorfer-Matt, T.Scheffzek, K.Liedl, K.R.Jansen-Durr, P.

(2018) Biochem J 475: 3561-3576

  • DOI: https://doi.org/10.1042/BCJ20180750
  • Primary Citation of Related Structures:  
    6FOG, 6FOH

  • PubMed Abstract: 

    Whereas enzymes in the fumarylacetoacetate hydrolase (FAH) superfamily catalyze several distinct chemical reactions, the structural basis for their multi-functionality remains elusive. As a well-studied example, human FAH domain-containing protein 1 (FAHD1) is a mitochondrial protein displaying both acylpyruvate hydrolase (ApH) and oxaloacetate decarboxylase (ODx) activity. As mitochondrial ODx, FAHD1 acts antagonistically to pyruvate carboxylase, a key metabolic enzyme. Despite its importance for mitochondrial function, very little is known about the catalytic mechanisms underlying FAHD1 enzymatic activities, and the architecture of its ligated active site is currently ill defined. We present crystallographic data of human FAHD1 that provide new insights into the structure of the catalytic center at high resolution, featuring a flexible 'lid'-like helical region which folds into a helical structure upon binding of the ODx inhibitor oxalate. The oxalate-driven structural transition results in the generation of a potential catalytic triad consisting of E33, H30 and an associated water molecule. In silico docking studies indicate that the substrate is further stabilized by a complex hydrogen-bond network, involving amino acids Q109 and K123, identified herein as potential key residues for FAHD1 catalytic activity. Mutation of amino acids H30, E33 and K123 each had discernible influence on the ApH and/or ODx activity of FAHD1, suggesting distinct catalytic mechanisms for both activities. The structural analysis presented here provides a defined structural map of the active site of FAHD1 and contributes to a better understanding of the FAH superfamily of enzymes.

  • Organizational Affiliation

    Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 82, Innsbruck A-6020, Austria.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acylpyruvase FAHD1, mitochondrial
A, B
224Homo sapiensMutation(s): 0 
Gene Names: FAHD1C16orf36YISKL
EC: (PDB Primary Data), (PDB Primary Data), (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q6P587 (Homo sapiens)
Explore Q6P587 
Go to UniProtKB:  Q6P587
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6P587
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.56 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.09α = 90
b = 77.82β = 90
c = 119.97γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European integrated FP6-LIFESCIHEALTH project MiMAGE512020
Austria Wirtschaftsservice Gesellschaft (AWS)Austria--
Austrian Science FundAustriaP28975

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-11-28
    Changes: Data collection, Database references