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A newly characterized malaria antigen on erythrocyte and merozoite surfaces induces parasite inhibitory antibodies

Journal Article · · Journal of Experimental Medicine
DOI:https://doi.org/10.1084/jem.20200170· OSTI ID:1811939
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We previously identified a Plasmodium falciparum (Pf) protein of unknown function encoded by a single-copy gene, PF3D7_1134300, as a target of antibodies in plasma of Tanzanian children in a whole-proteome differential screen. Here we characterize this protein as a blood-stage antigen that localizes to the surface membranes of both parasitized erythrocytes and merozoites, hence its designation as Pf erythrocyte membrane and merozoite antigen 1 (PfEMMA1). Mouse anti-PfEMMA1 antisera and affinity-purified human anti-PfEMMA1 antibodies inhibited growth of P. falciparum strains by up to 68% in growth inhibition assays. Following challenge with uniformly fatal Plasmodium berghei (Pb) ANKA, up to 40% of mice immunized with recombinant PbEMMA1 self-cured, and median survival of lethally infected mice was up to 2.6-fold longer than controls (21 vs. 8 d, P = 0.005). Furthermore, high levels of naturally acquired human anti-PfEMMA1 antibodies were associated with a 46% decrease in parasitemia over 2.5 yr of follow-up of Tanzanian children. Together, these findings suggest that antibodies to PfEMMA1 mediate protection against malaria.

Research Organization:
Brown Univ., Providence, RI (United States)
Sponsoring Organization:
Bill and Melinda Gates Foundation; National Institutes of Health (NIH); National Science Foundation (NSF); USDOE
OSTI ID:
1811939
Alternate ID(s):
OSTI ID: 1816668
Journal Information:
Journal of Experimental Medicine, Journal Name: Journal of Experimental Medicine Journal Issue: 9 Vol. 218; ISSN 0022-1007
Publisher:
Rockefeller University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (65)

Surface antigens of Plasmodium falciparum-infected erythrocytes as immune targets and malaria vaccine candidates journal April 2014
Rhop-3 protein conservation among Plasmodium species and induced protection against lethal P. yoelii and P. berghei challenge journal March 2006
Purification of human immunoglobulins by sequential precipitation with caprylic acid and ammonium sulphate journal January 1990
Non-globular domains in protein sequences: Automated segmentation using complexity measures journal September 1994
Functional Profiling of a Plasmodium Genome Reveals an Abundance of Essential Genes journal July 2017
The Phosphoproteomes of Plasmodium falciparum and Toxoplasma gondii Reveal Unusual Adaptations Within and Beyond the Parasites' Boundaries journal October 2011
STEVOR Is a Plasmodium falciparum Erythrocyte Binding Protein that Mediates Merozoite Invasion and Rosetting journal July 2014
A PfRH5-Based Vaccine Is Efficacious against Heterologous Strain Blood-Stage Plasmodium falciparum Infection in Aotus Monkeys journal January 2015
Chromatin Accessibility-Based Characterization of the Gene Regulatory Network Underlying Plasmodium falciparum Blood-Stage Development journal April 2018
Preferential invasion of reticulocytes during late-stage Plasmodium berghei infection accounts for reduced circulating reticulocyte levels journal November 2006
Protein export in malaria parasites: many membranes to cross journal August 2013
Protein export in malaria parasites: do multiple export motifs add up to multiple export pathways? journal January 2010
Recent advances in recombinant protein-based malaria vaccines journal December 2015
Progress with viral vectored malaria vaccines: A multi-stage approach involving “unnatural immunity” journal December 2015
Analysis of Plasmodium falciparum diversity in natural infections by deep sequencing journal June 2012
The blood-stage malaria antigen PfRH5 is susceptible to vaccine-inducible cross-strain neutralizing antibody journal September 2011
SignalP 4.0: discriminating signal peptides from transmembrane regions journal September 2011
Efficient CRISPR-Cas9–mediated genome editing in Plasmodium falciparum journal August 2014
Variant surface antigens of Plasmodium falciparum and their roles in severe malaria journal June 2017
Host-mediated selection impacts the diversity of Plasmodium falciparum antigens within infections journal April 2018
Anti-PfGARP activates programmed cell death of parasites and reduces severe malaria journal April 2020
An integrated platform for genome engineering and gene expression perturbation in Plasmodium falciparum journal January 2021
The utility of Plasmodium berghei as a rodent model for anti-merozoite malaria vaccine assessment journal April 2013
Selective permeabilization of the host cell membrane of Plasmodium falciparum-infected red blood cells with streptolysin O and equinatoxin II journal March 2007
Parasite Burden and Severity of Malaria in Tanzanian Children journal May 2014
Seven-Year Efficacy of RTS,S/AS01 Malaria Vaccine among Young African Children journal June 2016
Dual stage synthesis and crucial role of cytoadherence-linked asexual gene 9 in the surface expression of malaria parasite var proteins journal September 2010
Quantitative assessment of Plasmodium falciparum sexual development reveals potent transmission-blocking activity by methylene blue journal October 2011
Multiprotein complex between the GPI-anchored CyRPA with PfRH5 and PfRipr is crucial for Plasmodium falciparum erythrocyte invasion journal January 2015
Quantitative Proteomic Profiling Reveals Novel Plasmodium falciparum Surface Antigens and Possible Vaccine Candidates journal January 2018
SURFIN is a polymorphic antigen expressed on Plasmodium falciparum merozoites and infected erythrocytes journal June 2005
InterProScan 5: genome-scale protein function classification journal January 2014
Longitudinal data analysis using generalized linear models journal January 1986
Repetitive sequences in malaria parasite proteins journal October 2017
Transformation of malaria parasites by the spontaneous uptake and expression of DNA from human erythrocytes journal February 2001
PlasmoDB: a functional genomic database for malaria parasites journal January 2009
Scalable web services for the PSIPRED Protein Analysis Workbench journal June 2013
Biased amino acid composition in repeat regions of Plasmodium antigens journal May 1999
Discovery of a novel and conserved P lasmodium falciparum exported protein that is important for adhesion of PfEMP 1 at the surface of infected erythrocytes journal March 2015
New insights into the blood-stage transcriptome of Plasmodium falciparum using RNA-Seq journal April 2010
Discovery of Gene Function by Expression Profiling of the Malaria Parasite Life Cycle journal September 2003
Antibodies to PfSEA-1 block parasite egress from RBCs and protect against malaria infection journal May 2014
Cloning of naturally occurring mixed infections of malaria parasites journal May 1981
Human malaria parasites in continuous culture journal August 1976
Uncovering the essential genes of the human malaria parasite Plasmodium falciparum by saturation mutagenesis journal May 2018
New antigens for a multicomponent blood-stage malaria vaccine journal July 2014
Challenges and strategies for developing efficacious and long-lasting malaria vaccines journal January 2019
Phase 1 Clinical Trial of Apical Membrane Antigen 1: an Asexual Blood-Stage Vaccine for Plasmodium falciparum Malaria journal June 2005
A spiral scaffold underlies cytoadherent knobs in Plasmodium falciparum–infected erythrocytes journal January 2016
Human erythrocyte band 3 is a host receptor for Plasmodium falciparum glutamic acid–rich protein journal January 2019
PredGPI: a GPI-anchor predictor journal January 2008
Exposure of the Plasmodium falciparum clonally variant STEVOR proteins on the merozoite surface journal March 2011
Evaluation of immunoglobulin purification methods and their impact on quality and yield of antigen-specific antibodies journal July 2008
Polysome profiling reveals translational control of gene expression in the human malaria parasite Plasmodium falciparum journal January 2013
The Transcriptome of the Intraerythrocytic Developmental Cycle of Plasmodium falciparum journal August 2003
Tools and Strategies for Malaria Control and Elimination: What Do We Need to Achieve a Grand Convergence in Malaria? journal March 2016
A Malaria Vaccine That Elicits in Humans Antibodies Able to Kill Plasmodium falciparum journal November 2005
Identification of New PNEPs Indicates a Substantial Non-PEXEL Exportome and Underpins Common Features in Plasmodium falciparum Protein Export journal August 2013
Plasmodium falciparum Erythrocyte Invasion: Combining Function with Immune Evasion journal March 2014
Progress and prospects for blood-stage malaria vaccines journal January 2016
Synchronization of Plasmodium falciparum Erythrocytic Stages in Culture journal June 1979
Decrease in Numbers of Naive and Resting B Cells in HIV-Infected Kenyan Adults Leads to a Proportional Increase in Total and Plasmodium falciparum– Specific Atypical Memory B Cells journal May 2017
Genome-wide regulatory dynamics of translation in the Plasmodium falciparum asexual blood stages journal December 2014
An essential dual-function complex mediates erythrocyte invasion and channel-mediated nutrient uptake in malaria parasites journal February 2017
NK cells inhibit Plasmodium falciparum growth in red blood cells via antibody-dependent cellular cytotoxicity journal June 2018