5V7R image
Entry Detail
PDB ID:
5V7R
Keywords:
Title:
Cyrstal structure of anti-Tau antibody CBTAU-7.1 Fab
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-03-20
Release Date:
2017-04-12
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.22
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 41
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CBTAU-7.1 Fab heavy chain
Chain IDs:B (auth: H)
Chain Length:227
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:CBTAU-7.1 Fab light chain
Chain IDs:A (auth: L)
Chain Length:215
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation

Abstact

Several reports have described the presence of antibodies against Alzheimer's disease-associated hyperphosphorylated forms of tau in serum of healthy individuals. To characterize the specificities that can be found, we interrogated peripheral IgG+ memory B cells from asymptomatic blood donors for reactivity to a panel of phosphorylated tau peptides using a single-cell screening assay. Antibody sequences were recovered, cloned, and expressed as full-length IgGs. In total, 52 somatically mutated tau-binding antibodies were identified, corresponding to 35 unique clonal families. Forty-one of these antibodies recognize epitopes in the proline-rich and C-terminal domains, and binding of 26 of these antibodies is strictly phosphorylation dependent. Thirteen antibodies showed inhibitory activity in a P301S lysate seeded in vitro tau aggregation assay. Two such antibodies, CBTAU-7.1 and CBTAU-22.1, which bind to the proline-rich and C-terminal regions of tau, respectively, were characterized in more detail. CBTAU-7.1 recognizes an epitope that is similar to that of murine anti-PHF antibody AT8, but has different phospho requirements. Both CBTAU-7.1 and CBTAU-22.1 detect pathological tau deposits in post-mortem brain tissue. CBTAU-7.1 reveals a similar IHC distribution pattern as AT8, immunostaining (pre)tangles, threads, and neuritic plaques. CBTAU-22.1 shows selective detection of neurofibrillary changes by IHC. Taken together, these results suggest the presence of an ongoing antigen-driven immune response against tau in healthy individuals. The wide range of specificities to tau suggests that the human immune repertoire may contain antibodies that can serve as biomarkers or be exploited for therapy.

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Primary Citation of related structures