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<p>Protein nanoparticles in infectious disease vaccines enable protection through the periodic arrangement of antigens on their surface. These nanoparticles arise from organisms unrelated to the target disease, limiting their role as presentation platforms. Nanoparticles may also be compromised by pre-existing immunity to the nanoparticle carrier and may induce autoimmunity if conserved epitopes exist. Here we developed a potent multivalent malaria vaccine using an engineered <i>Plasmodium falciparum</i> pyridoxal 5′-phosphate (PLP) synthase as a nanoparticle that presents a designed <i>P. falciparum</i> circumsporozoite protein (CSP) and the <i>Plasmodium vivax</i> cell-transversal protein for ookinetes and sporozoites (CelTOS). These engineered vaccines elicited high titres of anti-CSP and anti-CelTOS antibodies, and three doses provided complete sterile protection against malaria in a mouse model. Cryogenic electron microscopy resolved a 2.95-Å resolution structure of the PLP nanoparticle including amino acid changes engineered to stabilize the nanoparticle. PLP synthase has no identifiable human ortholog limiting its propensity for autoimmunity or pre-existing immunity, and the engineered nanoparticles possess desirable manufacturing characteristics. These studies established an effective nanoparticle platform for malaria and infectious disease vaccines.</p>

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A Plasmodium-derived nanoparticle vaccine elicits sterile protection against malaria in mice

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Dashuang Shi,
  • Rui Ma,
  • Richi Gupta,
  • Thayne H. Dickey,
  • Palak N. Patel,
  • Nichole D. Salinas,
  • Wai Kwan Tang,
  • Alaysies Queen,
  • Myesha Singleton,
  • Nida Delbe,
  • Solomon Conteh,
  • Lynn E. Lambert,
  • Patrick E. Duffy,
  • Niraj H. Tolia

摘要

Protein nanoparticles in infectious disease vaccines enable protection through the periodic arrangement of antigens on their surface. These nanoparticles arise from organisms unrelated to the target disease, limiting their role as presentation platforms. Nanoparticles may also be compromised by pre-existing immunity to the nanoparticle carrier and may induce autoimmunity if conserved epitopes exist. Here we developed a potent multivalent malaria vaccine using an engineered Plasmodium falciparum pyridoxal 5′-phosphate (PLP) synthase as a nanoparticle that presents a designed P. falciparum circumsporozoite protein (CSP) and the Plasmodium vivax cell-transversal protein for ookinetes and sporozoites (CelTOS). These engineered vaccines elicited high titres of anti-CSP and anti-CelTOS antibodies, and three doses provided complete sterile protection against malaria in a mouse model. Cryogenic electron microscopy resolved a 2.95-Å resolution structure of the PLP nanoparticle including amino acid changes engineered to stabilize the nanoparticle. PLP synthase has no identifiable human ortholog limiting its propensity for autoimmunity or pre-existing immunity, and the engineered nanoparticles possess desirable manufacturing characteristics. These studies established an effective nanoparticle platform for malaria and infectious disease vaccines.