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How do eubacterial organisms manage aggregation-prone proteome?

Rishi Das Roy1, Manju Bhardwaj2, Vasudha Bhatnagar3

  • 1GNR Knowledge Centre for Genome Informatics, Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Delhi, 110007, India ; Department of Biotechnology, University of Pune, Pune, 411007, India.

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This summary is machine-generated.

Eubacterial genomes with lower guanine-cytosine (GC) content may have evolved to better manage protein aggregation and reduce reliance on chaperone proteins like GroEL, contrary to previous hypotheses.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Eubacterial genomes exhibit a wide range of guanine-cytosine (GC) content, from 20% to 70%.
  • Previous research suggested GC-poor organisms are more reliant on protein folding machinery due to accumulated mutations.
  • Protein folding simulations indicated GC-poor organisms' proteins aggregate more readily.

Purpose of the Study:

  • To investigate the relationship between eubacterial GC content and protein aggregation propensity.
  • To assess the correlation between GC content and chaperone (GroEL) dependence across eubacterial proteomes.
  • To test the hypothesis that GC-poor organisms are more dependent on protein folding machinery.

Main Methods:

  • Genome-wide analysis of eubacterial proteomes.
  • Classification of proteomes based on aggregation propensity and chaperone-dependence.
  • Application of multiple machine learning models for classification.

Main Results:

  • Contrary to expectations, protein aggregation propensity increased with higher GC content.
  • A significant positive correlation was observed between GC content and GroEL-dependence.
  • GC-poor proteomes demonstrated reduced dependence on GroEL compared to GC-rich proteomes.

Conclusions:

  • The findings challenge the established notion of GC-poor organisms' increased reliance on protein folding machinery.
  • A decrease in eubacterial GC content may be a selected trait for organisms experiencing proteostasis challenges.
  • Eubacteria may adapt to proteostasis issues by evolving lower GC content, not higher dependence on chaperones.