Crystal structure of mutant 2-methylcitrate synthase (mcsAG352A) from Aspergillus fumigatus

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 

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Comparative studies of Aspergillus fumigatus 2-methylcitrate synthase and human citrate synthase.

Schlachter, C.R.Klapper, V.Radford, T.Chruszcz, M.

(2019) Biol Chem 400: 1567-1581

  • DOI: https://doi.org/10.1515/hsz-2019-0106
  • Primary Citation of Related Structures:  
    5UQO, 5UQQ, 5UQR, 5UQS, 5UQU, 5UZP, 5UZQ, 5UZR, 6BOL, 6BOM, 6BON, 6BOO, 6BOP

  • PubMed Abstract: 

    Aspergillus fumigatus is a ubiquitous fungus that is not only a problem in agriculture, but also in healthcare. Aspergillus fumigatus drug resistance is becoming more prominent which is mainly attributed to the widespread use of fungicides in agriculture. The fungi-specific 2-methylcitrate cycle is responsible for detoxifying propionyl-CoA, a toxic metabolite produced as the fungus breaks down proteins and amino acids. The enzyme responsible for this detoxification is 2-methylcitrate synthase (mcsA) and is a potential candidate for the design of new anti-fungals. However, mcsA is very similar in structure to human citrate synthase (hCS) and catalyzes the same reaction. Therefore, both enzymes were studied in parallel to provide foundations for design of mcsA-specific inhibitors. The first crystal structures of citrate synthase from humans and 2-methylcitrate synthase from A. fumigatus are reported. The determined structures capture various conformational states of the enzymes and several inhibitors were identified and characterized. Despite a significant homology, mcsA and hCS display pronounced differences in substrate specificity and cooperativity. Considering that the active sites of the enzymes are almost identical, the differences in reactions catalyzed by enzymes are caused by residues that are in the vicinity of the active site and influence conformational changes of the enzymes.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
2-methylcitrate synthase, mitochondrial
A, B
441Aspergillus fumigatusMutation(s): 1 
Gene Names: mcsAcit1
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for Q50I20 (Aspergillus fumigatus)
Explore Q50I20 
Go to UniProtKB:  Q50I20
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ50I20
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.764α = 90
b = 94.151β = 90
c = 123.492γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-14
    Type: Initial release
  • Version 1.1: 2020-06-17
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Refinement description