Aldolase Is Essential for Energy Production and Bridging Adhesin-Actin Cytoskeletal Interactions during Parasite Invasion of Host Cells

G. Lucas Starnes, Mathieu Coincon, Jurgen Sygusch, L. David Sibley

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Apicomplexan parasites rely on actin-based motility to drive host cell invasion. Prior in vitro studies implicated aldolase, a tetrameric glycolytic enzyme, in coupling actin filaments to the parasite's surface adhesin microneme protein 2 (MIC2). Here, we test the essentiality of this interaction in host cell invasion. Based on in vitro studies and homology modeling, we generated a series of mutations in Toxoplasma gondii aldolase (TgALD1) that delineated MIC2 tail domain (MIC2t) binding function from its enzyme activity. We tested these mutants by complementing a conditional knockout of TgALD1. Mutations that affected glycolysis also reduced motility. Mutants only affecting binding to MIC2t had no motility phenotype, but were decreased in their efficiency of host cell invasion. Our studies demonstrate that aldolase is not only required for energy production but is also essential for efficient host cell invasion, based on its ability to bridge adhesin-cytoskeleton interactions in the parasite.

Original languageEnglish
Pages (from-to)353-364
Number of pages12
JournalCell Host and Microbe
Volume5
Issue number4
DOIs
StatePublished - Apr 23 2009

Keywords

  • MICROBIO

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