8ek1
From Proteopedia
Cryo-EM structure of a potent anti-malarial antibody L9 in complex with Plasmodium falciparum circumsporozoite protein (PfCSP)(dominant class)
Structural highlights
FunctionCSP_PLAF7 Essential sporozoite protein (PubMed:29554084, PubMed:32150583). In the mosquito vector, required for sporozoite development in the oocyst, migration through the vector hemolymph and entry into the vector salivary glands (By similarity). In the vertebrate host, required for sporozoite migration through the host dermis and infection of host hepatocytes (PubMed:29554084, PubMed:32150583). Binds to highly sulfated heparan sulfate proteoglycans (HSPGs) on the surface of host hepatocytes (By similarity).[UniProtKB:P23093][1] [2] In the vertebrate host, binds to highly sulfated heparan sulfate proteoglycans (HSPGs) on the surface of host hepatocytes and is required for sporozoite invasion of the host hepatocytes.[UniProtKB:P23093] Publication Abstract from PubMedMonoclonal antibody L9 recognizes the Plasmodium falciparum circumsporozoite protein (PfCSP) and is highly protective following controlled human malaria challenge. To gain insight into its function, we determined cryoelectron microscopy (cryo-EM) structures of L9 in complex with full-length PfCSP and assessed how this recognition influenced protection by wild-type and mutant L9s. Cryo-EM reconstructions at 3.6- and 3.7-A resolution revealed L9 to recognize PfCSP as an atypical trimer. Each of the three L9s in the trimer directly recognized an Asn-Pro-Asn-Val (NPNV) tetrapeptide on PfCSP and interacted homotypically to facilitate L9-trimer assembly. We analyzed peptides containing different repeat tetrapeptides for binding to wild-type and mutant L9s to delineate epitope and homotypic components of L9 recognition; we found both components necessary for potent malaria protection. Last, we found the 27-residue stretch recognized by L9 to be highly conserved in P. falciparum isolates, suggesting the newly revealed complete L9 epitope to be an attractive vaccine target. Cryo-EM structures of anti-malarial antibody L9 with circumsporozoite protein reveal trimeric L9 association and complete 27-residue epitope.,Tripathi P, Bender MF, Lei H, Da Silva Pereira L, Shen CH, Bonilla B, Dillon M, Ou L, Pancera M, Wang LT, Zhang B, Batista FD, Idris AH, Seder RA, Kwong PD Structure. 2023 Apr 6;31(4):480-491.e4. doi: 10.1016/j.str.2023.02.009. Epub 2023 , Mar 16. PMID:36931276[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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