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Correct partner makes the difference: Septin G-interface plays a critical role in amyloid formation
Patricia S Kumagai1, Carla S Martins1, Elisa M Sales2
1Instituto de Física de São Carlos, Universidade de São Paulo, Av. João Dagnone, 1100, São Carlos, SP CEP 13563-120, Brazil.
International Journal of Biological Macromolecules
|April 20, 2019
Summary
Septin protein interactions, specifically the G-interface, enhance thermal stability and prevent amyloid formation. This highlights the critical role of septin partnerships in maintaining cellular structural integrity and preventing disease-associated aggregation.
Area of Science:
- Biochemistry
- Cell Biology
- Structural Biology
Background:
- Septins are conserved eukaryotic GTP-binding proteins crucial for cell division and membrane dynamics.
- Septin malfunction is implicated in neurodegenerative diseases and cancer.
- Septins form filamentous heterocomplexes via G-interfaces and NC-interfaces.
Purpose of the Study:
- To investigate the impact of the SEPT6G-SEPT2G heterodimer G-interface on protein thermostability.
- To assess the influence of this interaction on amyloid formation propensity.
Main Methods:
- Studied the SEPT6G-SEPT2G heterodimer's G-interface.
- Assessed thermostability and amyloid formation using high-temperature analysis and Thioflavin-T binding assays.
Main Results:
- The SEPT6G-SEPT2G heterodimer exhibits amyloid-like properties at high temperatures, indicated by Thioflavin-T binding.
- This complex shows increased thermal and structural stability compared to individual septins.
- Individual septins, lacking partners, are less stable and prone to aggregation at physiological temperatures.
Conclusions:
- The G-interface plays a critical role in stabilizing septin complexes.
- Septin partnerships are essential for preventing amyloid aggregation and maintaining structural integrity.
- Understanding septin interactions offers insights into neurodegeneration and oncogenesis pathways.
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