Transcriptome, proteome, and protein synthesis within the intracellular cytomatrix

Area of Science:

• Cell Biology
• Biochemistry
• Structural Biology

Background:

• The cytoplasm's structural organization is poorly understood despite its role in vital cellular processes.
• Emerging models suggest the cytoplasm comprises distinct viscous fluid and elastic solid phases.

Purpose of the Study:

• To delineate the structural and functional organization of the cytoplasm.
• To characterize the distinct compartments of the cytoplasm: cytosol and cytomatrix.

Main Methods:

• Separation of viscous fluid (cytosol) and elastic solid (cytomatrix) compartments.
• High-throughput analysis of cytomatrix composition and associated biosynthetic pathways.
• Investigation of protein translation reprogramming within the cytomatrix.

Main Results:

• The cytomatrix contains structural proteins, ribosomes, and metabolic enzymes, with enriched biosynthetic pathways.
• Evidence of immobilized biocatalysis and local pathway segregation within the cytomatrix, potentially forming organelles.
• Protein translation was reprogrammed within the cytomatrix under drug-induced protein synthesis restriction.

Conclusions:

• The cytoplasm is organized into an interconnected network of cytosol and cytomatrix.
• Cytoplasmic compartmentalization enables operational flexibility in healthy cells and survival mechanisms in malignant cells.
• Immobilized enzymes and segregated pathways within the cytomatrix overcome spatial limitations for cellular processes.