rpn-3 Antibody
Description
Rpn-3 in Proteasome Function and Cellular Regulation
Rpn-3 is essential for proteasome assembly and substrate recognition. Studies in Saccharomyces cerevisiae reveal that rpn3 mutants exhibit defective proteasome activity, leading to accumulation of polyubiquitinated proteins, cell cycle arrest at metaphase, and sensitivity to proteotoxic stressors . Key findings include:
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Proteasome Stability: Rpn-3 ensures structural integrity of the 19S regulatory particle. Mutations (rpn3-4, rpn3-7) disrupt 19S-20S complex formation, impairing degradation of cell cycle regulators like Clb2 and Pds1 .
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Ubiquitin-Dependent Proteolysis: Rpn-3 facilitates recognition of polyubiquitinated substrates. rpn3 mutants accumulate ubiquitinated proteins, highlighting its role in substrate shuttling .
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Mitochondrial and Metabolic Roles: Rpn-3 deficiency correlates with mitochondrial dysfunction and altered glucose metabolism .
Applications of Rpn-3 Antibodies in Research
Commercial Rpn-3 antibodies enable species-specific detection and functional studies. Examples include:
Mechanistic Insights from Rpn-3 Antibody Studies
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Cell Cycle Regulation: Anti-Rpn-3 antibodies identified metaphase arrest in rpn3 mutants due to stabilized cyclins (Clb2) and checkpoint inhibitors (Pds1) .
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Immune Modulation: Rpn-3 interacts with ALG-2 in a Ca²⁺-dependent manner, linking proteasome activity to T cell apoptosis and immune response .
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Disease Models: Rpn-3 dysfunction correlates with neurodegenerative and autoimmune pathologies, validated using epitope-specific antibodies .
Validation and Technical Considerations
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Specificity: Antibodies against Schizosaccharomyces pombe Rpn-3 show no cross-reactivity with human PSMD3 .
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Caution in Interpretation: Epitope accessibility varies between species; murine monoclonal antibodies may miss conformational epitopes in human cells .
