Crystal structure of Toxoplasma gondii Mitochondrial Association Factor 1 A (MAF1A)

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


A Toxoplasma gondii locus required for the direct manipulation of host mitochondria has maintained multiple ancestral functions.

Blank, M.L.Parker, M.L.Ramaswamy, R.Powell, C.J.English, E.D.Adomako-Ankomah, Y.Pernas, L.F.Workman, S.D.Boothroyd, J.C.Boulanger, M.J.Boyle, J.P.

(2018) Mol Microbiol 108: 519-535

  • DOI: https://doi.org/10.1111/mmi.13947
  • Primary Citation of Related Structures:  
    6BXR, 6BXS, 6BXT, 6BXW

  • PubMed Abstract: 

    The Toxoplasma gondii locus mitochondrial association factor 1 (MAF1) encodes multiple paralogs, some of which mediate host mitochondrial association (HMA). Previous work showed that HMA was a trait that arose in T. gondii through neofunctionalization of an ancestral MAF1 ortholog. Structural analysis of HMA-competent and incompetent MAF1 paralogs (MAF1b and MAF1a, respectively) revealed that both paralogs harbor an ADP ribose binding macro-domain, with comparatively low (micromolar) affinity for ADP ribose. Replacing the 16 C-terminal residues of MAF1b with those of MAF1a abrogated HMA, and we also show that only three residues in the C-terminal helix are required for MAF1-mediated HMA. Importantly these same three residues are also required for the in vivo growth advantage conferred by MAF1b, providing a definitive link between in vivo proliferation and manipulation of host mitochondria. Co-immunoprecipitation assays reveal that the ability to interact with the mitochondrial MICOS complex is shared by HMA-competent and incompetent MAF1 paralogs and mutants. The weak ADPr coordination and ability to interact with the MICOS complex shared between divergent paralogs may represent modular ancestral functions for this tandemly expanded and diversified T. gondii locus.

  • Organizational Affiliation

    Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
mitochondrial association factor 1
A, B, C
281Toxoplasma gondiiMutation(s): 0 
Gene Names: MAF1
Find proteins for A0A193AUK9 (Toxoplasma gondii)
Explore A0A193AUK9 
Go to UniProtKB:  A0A193AUK9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A193AUK9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth B],
J [auth B],
K [auth B],
L [auth B],
M [auth C],
N [auth C],
O [auth C],
P [auth C],
Q [auth C]
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.89α = 90
b = 49.67β = 96.09
c = 114.75γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
Aimlessdata scaling
PDB_EXTRACTdata extraction
iMOSFLMdata reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaDiscovery Grant

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-19
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description