6B5N

Structure of PfCSP peptide 25 with human protective antibody CIS43

Summary for 6B5N

• Entry DOI: 10.2210/pdb6b5n/pdb
• Related: 6B5L 6B5M
• Descriptor: CIS43 Fab Heavy chain, CIS43 Fab Light chain, pfCSP peptide 25: ASN-VAL-ASP-PRO-ASN-ALA-ASN-PRO-ASN-VAL-ASP, ... (4 entities in total)
• Functional Keywords: malaria, pfcsp, vaccine, antibodies, immune system
• Biological source: Homo sapiens; More
• Total number of polymer chains: 3
• Total formula weight: 49909.50

Authors

Pancera, M.,Weidle, C. (deposition date: 2017-09-29, release date: 2018-03-21, Last modification date: 2024-10-23)

Primary citation

Kisalu, N.K.,Idris, A.H.,Weidle, C.,Flores-Garcia, Y.,Flynn, B.J.,Sack, B.K.,Murphy, S.,Schon, A.,Freire, E.,Francica, J.R.,Miller, A.B.,Gregory, J.,March, S.,Liao, H.X.,Haynes, B.F.,Wiehe, K.,Trama, A.M.,Saunders, K.O.,Gladden, M.A.,Monroe, A.,Bonsignori, M.,Kanekiyo, M.,Wheatley, A.K.,McDermott, A.B.,Farney, S.K.,Chuang, G.Y.,Zhang, B.,Kc, N.,Chakravarty, S.,Kwong, P.D.,Sinnis, P.,Bhatia, S.N.,Kappe, S.H.I.,Sim, B.K.L.,Hoffman, S.L.,Zavala, F.,Pancera, M.,Seder, R.A.
A human monoclonal antibody prevents malaria infection by targeting a new site of vulnerability on the parasite.
Nat. Med., 24:408-416, 2018

PubMed Abstract: Development of a highly effective vaccine or antibodies for the prevention and ultimately elimination of malaria is urgently needed. Here we report the isolation of a number of human monoclonal antibodies directed against the Plasmodium falciparum (Pf) circumsporozoite protein (PfCSP) from several subjects immunized with an attenuated Pf whole-sporozoite (SPZ) vaccine (Sanaria PfSPZ Vaccine). Passive transfer of one of these antibodies, monoclonal antibody CIS43, conferred high-level, sterile protection in two different mouse models of malaria infection. The affinity and stoichiometry of CIS43 binding to PfCSP indicate that there are two sequential multivalent binding events encompassing the repeat domain. The first binding event is to a unique 'junctional' epitope positioned between the N terminus and the central repeat domain of PfCSP. Moreover, CIS43 prevented proteolytic cleavage of PfCSP on PfSPZ. Analysis of crystal structures of the CIS43 antigen-binding fragment in complex with the junctional epitope determined the molecular interactions of binding, revealed the epitope's conformational flexibility and defined Asn-Pro-Asn (NPN) as the structural repeat motif. The demonstration that CIS43 is highly effective for passive prevention of malaria has potential application for use in travelers, military personnel and elimination campaigns and identifies a new and conserved site of vulnerability on PfCSP for next-generation rational vaccine design.

PubMed: 29554083
DOI: 10.1038/nm.4512

Experimental method

X-RAY DIFFRACTION (1.98 Å)