A feature analysis of lower solubility proteins in three eukaryotic systems
Razvan F Albu1, Gerard T Chan1, Mang Zhu1
1Department of Biochemistry and Molecular Biology and Centre for High-Throughput Biology, University of British Columbia, Vancouver, BC, V6T 1Z4 Canada.
Researchers identified common traits of low solubility proteins across yeast, human, and mouse cells. These proteins are typically longer, less abundant, and possess more disordered regions, linking them to functional aggregates.
Area of Science:
- Biochemistry
- Cell Biology
- Proteomics
Background:
- Misfolded proteins can form harmful aggregates, necessitating cellular quality control mechanisms.
- Failure in protein clearance can lead to the accumulation of low solubility proteins.
- Protein promiscuity is crucial for function but can drive aggregation.
Purpose of the Study:
- To identify and characterize the features of low solubility proteins.
- To understand the universal determinants of protein solubility across different species.
Main Methods:
- Analysis of proteins precipitating after centrifugation in yeast, human SH-SY5Y, and mouse brain cells.
- Normalization for protein abundance to reliably identify low solubility proteins.
- Comparison of structural and abundance features between soluble and insoluble protein fractions.
Main Results:
- Low solubility proteins are generally longer and less abundant.
- These proteins contain fewer hydrophobic amino acids and more low complexity/disordered regions.
- Identified common traits across three distinct eukaryotic model systems.
Conclusions:
- A novel approach was developed to identify low solubility proteins in unstressed cells.
- Cross-species analysis revealed shared and unique characteristics of low solubility proteins.
- Structural features of low solubility proteins are linked to increased promiscuity and aggregation potential.
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