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Molecular and functional properties of human Plasmodium falciparum CSP C-terminus antibodies

Journal Article · · EMBO Molecular Medicine
 [1];  [2];  [3];  [1];  [3];  [4];  [5];  [6];  [7];  [4];  [8];  [2];  [4]
  1. German Cancer Research Center, Heidelberg (Germany); Heidelberg Univ. (Germany)
  2. Max Planck Institute for Infection Biology, Berlin (Germany)
  3. The Hospital for Sick Children Research Institute, Toronto, ON (Canada)
  4. German Cancer Research Center, Heidelberg (Germany)
  5. Sanaria Inc., Rockville, MD (United States)
  6. Institute of Tropical Medicine, Tübingen (Germany); Centre de Recherches de Lambaréné (CERMEL) (Gabon)
  7. Institute of Tropical Medicine, Tübingen (Germany); Radboud Univ., Nijmegen (Netherlands)
  8. The Hospital for Sick Children Research Institute, Toronto, ON (Canada); Univ. of Toronto, ON (Canada)
Human monoclonal antibodies (mAbs) against the central repeat and junction domain of Plasmodium falciparum circumsporozoite protein (PfCSP) have been studied extensively to guide malaria vaccine design compared to antibodies against the PfCSP C terminus. Here, we describe the molecular characteristics and protective potential of 73 germline and mutated human mAbs against the highly immunogenic PfCSP C-terminal domain. Two mAbs recognized linear epitopes in the C-terminal linker with sequence similarity to repeat and junction motifs, whereas all others targeted conformational epitopes in the α-thrombospondin repeat (α-TSR) domain. Specificity for the polymorphic Th2R/Th3R but not the conserved RII+/CS.T3 region in the α-TSR was associated with IGHV3-21/IGVL3-21 or IGLV3-1 gene usage. Although the C terminus specific mAbs showed signs of more efficient affinity maturation and class-switching compared to anti-repeat mAbs, live sporozoite binding and inhibitory activity was limited to a single C-linker reactive mAb with cross-reactivity to the central repeat and junction. The data provide novel insights in the human anti-C-linker and anti-α-TSR antibody response that support exclusion of the PfCSP C terminus from malaria vaccine designs.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Bill and Melinda Gates Foundation; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2423519
Journal Information:
EMBO Molecular Medicine, Journal Name: EMBO Molecular Medicine Journal Issue: 6 Vol. 15; ISSN 1757-4676
Publisher:
EMBO PressCopyright Statement
Country of Publication:
United States
Language:
English

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