Functional and biophysical analyses of the class XIV Toxoplasma gondii Myosin D



The obligate intracellular parasite Toxoplasma gondii uses gliding motility to migrate across the biological barriers of the host and to invade cells. This unique form of locomotion requires an intact actin cytoskeleton and involves at least one motor protein (TgMyoA) that belongs to the class XIV of the myosin superfamily. TgMyoA is anchored in the inner membrane complex and is essential for the gliding motion, host cell invasion and egress of T. gondii tachyzoites. TgMyoD is the smallest T. gondii myosin and is structurally very closely related to TgMyoA. We show here that TgMyoD exhibits similar transient kinetic properties as the fast single-headed TgMyoA. To determine if TgMyoD also contributes to parasite gliding motility, the TgMyoD gene was disrupted by double homologous recombination. In contrast to TgMyoA, TgMyoD gene is dispensable for tachyzoite propagation and motility. Parasites lacking TgMyoD glide normally and their virulence is not compromised in mice. The fact that TgMyoD is predominantly expressed in bradyzoites explains the absence of a phenotype observed with myodko in tachyzoites and does not exclude a role of this motor in gliding that would be restricted to the cyst forming but nevertheless motile stage of the parasite.


ATPase Activity Toxoplasma Gondii Host Cell Invasion Double Homologous Recombination Phosphoenol Pyruvic Acid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



butanedione monoxime

mant ATP

N-methylanthraniloyl derivatives of 2′deoxy-ATP


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Copyright information

© Springer 2006

Authors and Affiliations

    • 1
    • 2
    • 1
    • 3
    • 4
    • 4
    • 7
    • 2
    • 8
    • 5
    • 6
    • 4
    • 2
    • 9
  1. 1.HygieneinstitutUniversitätsklinikum HeidelbergHeidelbergGermany
  2. 2.Zentrum für Molekulare BiologieUniversität HeidelbergHeidelbergGermany
  3. 3.Laboratoire Biologie des Protistes, UMR CNRS 6023Université Blaise PascalAubière cedexFrance
  4. 4.Department of BiosciencesUniversity of KentCanterburyUK
  5. 5.Laboratoire de Chimie Biologique CNRS UMR 8576Bâtiment C9 Université des Sciences et Technologies de LilleVilleneuve d’AscqFrance
  6. 6.Department of Molecular MicrobiologyWashington University School of MedicineSt. LouisUSA
  7. 7.Department of BiophysicsUniversity of PécsPécsHungary
  8. 8.Heidelberger Institut für PflanzenwissenschaftenUniversität HeidelbergHeidelbergGermany
  9. 9.Department of Microbiology and Molecular Medicine, Faculty of MedicineUniversity of Geneva CMUGeneva 4Switzerland

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