6UC5 image
Entry Detail
PDB ID:
6UC5
Keywords:
Title:
Fab397 in complex with NPNA peptide
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2019-09-13
Release Date:
2020-01-08
Method Details:
Experimental Method:
Resolution:
1.75 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Fab397 heavy chain
Chain IDs:A (auth: H)
Chain Length:220
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Fab397 light chain
Chain IDs:B (auth: L)
Chain Length:218
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:NPNA peptide
Chain IDs:C (auth: P)
Chain Length:11
Number of Molecules:1
Biological Source:Plasmodium falciparum 3D7
Primary Citation
Diverse Antibody Responses to Conserved Structural Motifs in Plasmodium falciparum Circumsporozoite Protein.
J.Mol.Biol. 432 1048 1063 (2020)
PMID: 31883801 DOI: 10.1016/j.jmb.2019.12.029

Abstact

Malaria vaccine candidate RTS,S/AS01 is based on the central and C-terminal regions of the circumsporozoite protein (CSP) of P. falciparum. mAb397 was isolated from a volunteer in an RTS,S/AS01 clinical trial, and it protects mice from infection by malaria sporozoites. However, mAb397 originates from the less commonly used VH3-15 germline gene compared to the VH3-30/33 antibodies generally elicited by RTS,S to the central NANP repeat region of CSP. The crystal structure of mAb397 with an NPNA4 peptide shows that the central NPNA forms a type I β-turn and is the main recognition motif. In most anti-NANP antibodies studied to date, a germline-encoded Trp is used to engage the Pro in NPNA β-turns, but here the Trp interacts with the first Asn. This "conserved" Trp, however, can arise from different germline genes and be located in the heavy or the light chain. Variation in the terminal ψ angles of the NPNA β-turns results in different dispositions of the subsequent NPNA and, hence, different stoichiometries and modes of antibody binding to rsCSP. Diverse protective antibodies against NANP repeats are therefore not limited to a single germline gene response or mode of binding.

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Primary Citation of related structures