6PCU image
Deposition Date 2019-06-18
Release Date 2019-09-04
Last Version Date 2024-10-30
Entry Detail
PDB ID:
6PCU
Title:
VP8* of a G2P[4] human rotavirus in complex with scFv antibody 9
Biological Source:
Source Organism:
Rotavirus A (Taxon ID: 28875)
Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
I 41 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Outer capsid protein VP4
Gene (Uniprot):VP4
Chain IDs:A, C (auth: D), E (auth: G)
Chain Length:162
Number of Molecules:3
Biological Source:Rotavirus A
Polymer Type:polypeptide(L)
Molecule:Variable domain of antibody scFv9
Chain IDs:B, D (auth: E), F (auth: H)
Chain Length:252
Number of Molecules:3
Biological Source:Homo sapiens
Primary Citation
Human VP8* mAbs neutralize rotavirus selectively in human intestinal epithelial cells.
J.Clin.Invest. 130 3839 3851 (2019)
PMID: 31403468 DOI: 10.1172/JCI128382

Abstact

We previously generated 32 rotavirus-specific (RV-specific) recombinant monoclonal antibodies (mAbs) derived from B cells isolated from human intestinal resections. Twenty-four of these mAbs were specific for the VP8* fragment of RV VP4, and most (20 of 24) were non-neutralizing when tested in the conventional MA104 cell-based assay. We reexamined the ability of these mAbs to neutralize RVs in human intestinal epithelial cells including ileal enteroids and HT-29 cells. Most (18 of 20) of the "non-neutralizing" VP8* mAbs efficiently neutralized human RV in HT-29 cells or enteroids. Serum RV neutralization titers in adults and infants were significantly higher in HT-29 than MA104 cells and adsorption of these sera with recombinant VP8* lowered the neutralization titers in HT-29 but not MA104 cells. VP8* mAbs also protected suckling mice from diarrhea in an in vivo challenge model. X-ray crystallographic analysis of one VP8* mAb (mAb9) in complex with human RV VP8* revealed that the mAb interaction site was distinct from the human histo-blood group antigen binding site. Since MA104 cells are the most commonly used cell line to detect anti-RV neutralization activity, these findings suggest that prior vaccine and other studies of human RV neutralization responses may have underestimated the contribution of VP8* antibodies to the overall neutralization titer.

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