TATC Antibody
Description
Definition and Context
Anti-Tat antibodies are immunoglobulins produced in response to the HIV-1 transactivator of transcription (Tat) protein, which is critical for viral replication and immune dysregulation. These antibodies aim to neutralize Tat’s extracellular toxicity and intracellular roles in viral pathogenesis .
TatC, by contrast, is a transmembrane protein in bacterial twin-arginine translocation (Tat) systems, essential for exporting folded proteins across membranes . No studies in the provided literature describe antibodies targeting TatC.
2.1. Broadly Neutralizing Monoclonal Antibodies (mAbs)
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mAb 7G12 (derived from Tat Oyi immunization) recognizes a conformational epitope shared across HIV-1 subtypes (clades B, C, and others). Key properties include:
| Property | Value/Outcome | Source |
|---|---|---|
| Affinity (K<sub>D</sub>) | 3.2–12 nM (variants CM240, UG11RP, etc.) | |
| Cross-reactivity | Binds all tested Tat variants | |
| Neutralization | Blocks Tat uptake and biological activity |
This mAb’s ability to target a conserved structural epitope—rather than linear sequences—reduces susceptibility to viral escape mutations .
2.2. Anti-Tat Antibody Isotypes and Clinical Correlations
A cohort study of 96 HIV-infected individuals revealed:
IgM’s protective role suggests early immune control, while IgA may indicate dysregulated responses .
Mechanisms of Action
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Neutralization: Anti-Tat IgG and IgM block Tat’s interaction with cell-surface receptors (e.g., heparan sulfate proteoglycans) and internalization, preventing nuclear translocation and transcriptional activation .
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Immune Modulation: By binding extracellular Tat, these antibodies reduce apoptosis in CD4+ T cells and suppress pro-inflammatory cytokine cascades .
Therapeutic Potential
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Passive Immunization: mAb 7G12 shows promise in restoring immunity by neutralizing extracellular Tat, a strategy tested in preclinical models .
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Vaccine Development: Natural anti-Tat responses correlate with non-progression, highlighting Tat as a vaccine target .
Unresolved Questions
Product Specs
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Target Background
- MEF31 indirectly influences editing at site tatC-586, but does not directly target it. PMID: 29216369
- Mitochondrial-encoded TatC in the model plant Arabidopsis thaliana is a functional gene that is translated into a protein. A TatB--like subunit localized to the inner membrane, encoded by the nucleus, has also been identified. This subunit is essential for plant growth and development. PMID: 27609835
- Tissues from Arabidopsis thaliana demonstrate an approximately equimolar ratio of TatB and TatC components, while TatA is present only in minor amounts. [TatC] PMID: 18930082
- Chloroplast TatC targets thylakoid membranes through a stromal intermediate. The integration of cpTatC into the membrane is unaffected by competition with precursors of the cpSec and cpTat pathways. PMID: 19207210
