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Updated: Feb 10, 2026

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
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A peptide catalyst can replace an essential enzyme in a eukaryotic cell.

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    Short peptides can replace essential enzymes in cells, demonstrating their potential as early catalysts before complex protein evolution. This finding supports peptide-based catalysis as a precursor to modern protein enzymes.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Evolutionary Biology

    Background:

    • Protein enzymes are crucial for biological catalysis, but their evolutionary origins are unclear.
    • The emergence of catalysis before large, folded proteins is a significant unresolved question in biology.

    Purpose of the Study:

    • To investigate if short, genetically encoded peptides can functionally replace essential enzymes in vivo.
    • To explore the catalytic capabilities of minimal peptides in a cellular context.

    Main Methods:

    • Designed minimal peptides with a Cys-Xaa-Cys motif and ER retention signal.
    • Identified peptide variants that rescue the lethal deletion of protein disulfide isomerase (PDI) in Saccharomyces cerevisiae.
    • Performed biochemical analyses to assess peptide activity and dependence on chemical environment and secondary structure.

    Main Results:

    • Identified functional peptides that rescued PDI deletion in yeast cells, enabling cell viability.
    • Observed slower cell growth and activation of stress-response pathways, indicating lower catalytic efficiency compared to PDI.
    • Demonstrated that peptide catalytic activity relies on local environment and secondary structure, not a globular fold.

    Conclusions:

    • Short peptides can replace essential cellular reactions in vivo, functioning as catalysts at the system level.
    • These findings support the hypothesis that peptide-based catalysis predates the evolution of modern protein enzymes.
    • This study provides evidence for the plausibility of a peptide-centric origin for biological catalysis.