Evidence map›Paper›PMID 21713006›Full record

ArticlePloS one2011

Identification of a highly antigenic linear B cell epitope within Plasmodium vivax apical membrane antigen 1 (AMA-1).

Lilian Lacerda Bueno, Francisco Pereira Lobo, Cristiane Guimarães Morais, Luíza Carvalho Mourão, Ricardo Andrez Machado de Ávila, Irene Silva Soares, Cor Jesus Fontes, Marcus Vinícius Lacerda, Carlos Chavez Olórtegui, Daniella Castanheira Bartholomeu and 2 more

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed
3.5field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

33 citing papers in PubMed, 52 citations in OpenAlex.

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  9. Computational Vaccine Design for Poxviridae Family Viruses.Methods in molecular biology (Clifton, N.J.) · 2023
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  12. Frontiers in immunology · 2022
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  17. Computational tools for modern vaccine development.Human vaccines & immunotherapeutics · 2020
    Review
  18. Article
  19. Antibody Responses AgainstFrontiers in immunology · 2019
    Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

12 authors at 6 institutions in 1 country.

Lilian Lacerda BuenoDepartamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Francisco Pereira Lobo
Cristiane Guimarães Morais
Luíza Carvalho Mourão
Ricardo Andrez Machado de Ávila
Irene Silva Soares
Cor Jesus Fontes
Marcus Vinícius Lacerda
Carlos Chavez Olórtegui
Daniella Castanheira Bartholomeu
Ricardo Toshio Fujiwara
Erika Martins Braga
Universidade Federal de Minas Gerais · BRFundação de Medicina Tropical · BRInstituto Nacional de Ciência e Tecnologia de Ciência Animal · BRInstituto Nacional de Ciência e Tecnologia de Doenças Tropicais · BRUniversidade de São Paulo · BRUniversidade Federal de Mato Grosso · BR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Apical membrane antigen 1 (AMA-1) is considered to be a major candidate antigen for a malaria vaccine. Previous immunoepidemiological studies of naturally acquired immunity to Plasmodium vivax AMA-1 (PvAMA-1) have shown a higher prevalence of specific antibodies to domain II (DII) of AMA-1. In the present study, we confirmed that specific antibody responses from naturally infected individuals were highly reactive to both full-length AMA-1 and DII. Also, we demonstrated a strong association between AMA-1 and DII IgG and IgG subclass responses. We analyzed the primary sequence of PvAMA-1 for B cell linear epitopes co-occurring with intrinsically unstructured/disordered regions (IURs). The B cell epitope comprising the amino acid sequence 290-307 of PvAMA-1 (SASDQPTQYEEEMTDYQK), with the highest prediction scores, was identified in domain II and further selected for chemical synthesis and immunological testing. The antigenicity of the synthetic peptide was identified by serological analysis using sera from P. vivax-infected individuals who were knowingly reactive to the PvAMA-1 ectodomain only, domain II only, or reactive to both antigens. Although the synthetic peptide was recognized by all serum samples specific to domain II, serum with reactivity only to the full-length protein presented 58.3% positivity. Moreover, IgG reactivity against PvAMA-1 and domain II after depletion of specific synthetic peptide antibodies was reduced by 18% and 33% (P = 0.0001 for both), respectively. These results suggest that the linear epitope SASDQPTQYEEEMTDYQK is highly antigenic during natural human infections and is an important antigenic region of the domain II of PvAMA-1, suggesting its possible future use in pre-clinical studies.

Indexed as

AdolescentAdultAgedAmino Acid SequenceAnimalsAntibodies, ProtozoanAntigens, ProtozoanEpitopes, B-LymphocyteHumansMalaria, VivaxMembrane ProteinsMiddle AgedMolecular Sequence DataPeptidesPlasmodium vivaxProtozoan ProteinsAntibodies, ProtozoanAntigens, Protozoanapical membrane antigen I, PlasmodiumEpitopes, B-LymphocyteMembrane ProteinsPeptidesProtozoan Proteins

Identifiers

PMID21713006
PMCPMC3119695
OpenAlexW1966973062

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.