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Type: Journal article
Title: Conditional expression of apical membrane antigen 1 in Plasmodium falciparum shows it is required for erythrocyte invasion by merozoites
Author: Yap, A.
Azevedo, M.F.
Gilson, P.R.
Weiss, G.E.
O'Neill, M.T.
Wilson, D.W.
Crabb, B.S.
Cowman, A.F.
Citation: Cellular Microbiology, 2014; 16(5):642-656
Publisher: Wiley
Issue Date: 2014
ISSN: 1462-5814
Statement of
Alan Yap, Mauro F. Azevedo, Paul R. Gilson, Greta E. Weiss, Matthew T. O’Neill, Danny W. Wilson, Brendan S. Crabb and Alan F. Cowman
Abstract: Malaria is caused by obligate intracellular parasites, of which Plasmodium falciparum is the most lethal species. In humans, P. falciparum merozoites (invasive forms of the parasite) employ a host of parasite proteins to rapidly invade erythrocytes. One of these is the P. falciparum apical membrane antigen 1 (PfAMA1) which forms a complex with rhoptry neck proteins at the tight junction. Here, we have placed the Pfama1 gene under conditional control using dimerizable Cre recombinase (DiCre) in P. falciparum. DiCre‐mediated excision of the loxP‐flanked Pfama1 gene results in approximately 80% decreased expression of the protein within one intraerythrocytic growth cycle. This reduces growth by 40%, due to decreased invasion efficiency characterized by a post‐invasion defect in sealing of the parasitophorous vacuole. These results show that PfAMA1 is an essential protein for merozoite invasion in P. falciparum and either directly or indirectly plays a role in resealing of the red blood cell at the posterior end of the invasion event.
Keywords: Erythrocytes
Plasmodium falciparum
Membrane Proteins
Protozoan Proteins
Antigens, Protozoan
Molecular Biology
Gene Expression
Recombination, Genetic
Rights: © 2014 The Authors. Cellular Microbiology published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
DOI: 10.1111/cmi.12287
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Molecular and Biomedical Science publications

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