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Volume 157, Issue 12

Pyruvate : ferredoxin oxidoreductase (PFO) is a surface-associated cell-binding protein in and is involved in trichomonal adherence to host cells Free

Abstract

The 120 kDa protein adhesin (AP120) is induced under iron-rich conditions and has sequence homology with pyruvate : ferredoxin oxidoreductase A (PFO A), a hydrogenosomal enzyme that is absent in humans. This homology raises the possibility that, like AP120, PFO might be localized to the parasite surface and participate in cytoadherence. Here, the cellular localization and function of PFO that was expressed under various iron concentrations was investigated using a polyclonal antibody generated against the 50 kDa recombinant C-terminal region of PFO A (anti-PFO50). In Western blot assays, this antibody recognized a 120 kDa protein band in total protein extracts, and proteins with affinity to the surface of HeLa cells from parasites grown under iron-rich conditions. In addition to localization that is typical of hydrogenosomal proteins, PFOs that were expressed under iron-rich conditions were found to localize at the surface. This localization was demonstrated using immunofluorescence and co-localization assays, as well as immunogold transmission electron microscopy. In addition to describing its enzyme activity, we describe a novel function in trichomonal host interaction for the PFO localized on the parasite surface. The anti-PFO50 antibody reduced the levels of adherence to HeLa cell monolayers in a concentration-dependent manner. Thus, PFO is an example of a surface-associated cell-binding protein that lacks enzyme activity and that is involved in cytoadherence. Additionally, PFO behaves like AP120 in parasites grown under iron-rich conditions. Therefore, these data suggest that AP120 and PFO A are encoded by the same gene, namely

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  • Accepted:
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  • Published Online:
Funding
This study was supported by the:
  • Department of Infectomics and Molecular Pathogenesis
  • CINVESTAV-IPN (Award 68949, 58611 and 33044 M)
  • CONACYT-México
  • Instituto de Ciencia y Tecnología del D.F (Award ICyT-299)
  • CONACYT-México
© 2011 SGM
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2011-12-01
2024-04-16
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Pyruvate : ferredoxin oxidoreductase (PFO) is a surface-associated cell-binding protein in Trichomonas vaginalis and is involved in trichomonal adherence to host cells
Microbiology 157, 3469 (2011); https://doi.org/10.1099/mic.0.053033-0
/content/journal/micro/10.1099/mic.0.053033-0
/content/journal/micro/10.1099/mic.0.053033-0
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