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Investigating the Host Binding Signature on the Plasmodium falciparum PfEMP1 Protein Family

Authors: Janes, Joel; Wang, Christopher; Levin-Edens, Emily; Vigan-Womas, Inès; Guillotte, Micheline; Melcher, Martin; Mercereau-Puijalon, Odile; +1 Authors

Investigating the Host Binding Signature on the Plasmodium falciparum PfEMP1 Protein Family

Abstract

The Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) family plays a central role in antigenic variation and cytoadhesion of P. falciparum infected erythrocytes. PfEMP1 proteins/var genes are classified into three main subfamilies (UpsA, UpsB, and UpsC) that are hypothesized to have different roles in binding and disease. To investigate whether these subfamilies have diverged in binding specificity and test if binding could be predicted by adhesion domain classification, we generated a panel of 19 parasite lines that primarily expressed a single dominant var transcript and assayed binding against 12 known host receptors. By limited dilution cloning, only UpsB and UpsC var genes were isolated, indicating that UpsA var gene expression is rare under in vitro culture conditions. Consequently, three UpsA variants were obtained by rosette purification and selection with specific monoclonal antibodies to create a more representative panel. Binding assays showed that CD36 was the most common adhesion partner of the parasite panel, followed by ICAM-1 and TSP-1, and that CD36 and ICAM-1 binding variants were highly predicted by adhesion domain sequence classification. Binding to other host receptors, including CSA, VCAM-1, HABP1, CD31/PECAM, E-selectin, Endoglin, CHO receptor "X", and Fractalkine, was rare or absent. Our findings identify a category of larger PfEMP1 proteins that are under dual selection for ICAM-1 and CD36 binding. They also support that the UpsA group, in contrast to UpsB and UpsC var genes, has diverged from binding to the major microvasculature receptor CD36 and likely uses other mechanisms to sequester in the microvasculature. These results demonstrate that CD36 and ICAM-1 have left strong signatures of selection on the PfEMP1 family that can be detected by adhesion domain sequence classification and have implications for how this family of proteins is specializing to exploit hosts with varying levels of anti-malaria immunity.

Country
France
Keywords

CD36 Antigens, Erythrocytes, [SDV.IMM] Life Sciences [q-bio]/Immunology, QH301-705.5, Plasmodium falciparum, Protozoan Proteins, CHO Cells, [SDV.BBM.BM] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, Thrombospondin 1, Cricetulus, Cricetinae, Cell Adhesion, Animals, Humans, Biology (General), Cloning, Molecular, Malaria, Falciparum, [SDV.MP] Life Sciences [q-bio]/Microbiology and Parasitology, [SDV.BC] Life Sciences [q-bio]/Cellular Biology, Cells, Cultured, Reverse Transcriptase Polymerase Chain Reaction, Antibodies, Monoclonal, RC581-607, Intercellular Adhesion Molecule-1, Antigenic Variation, Phenotype, [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, Immunologic diseases. Allergy, Research Article, Protein Binding

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
122
Top 10%
Top 10%
Top 10%
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