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Related Experiment Videos

Enzyme recruitment in evolution of new function

R A Jensen

    Annual Review of Microbiology
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Early cells maximized biochemical flexibility with broad-specificity enzymes, leading to fortuitous metabolite formation. Gene duplication enabled enzyme specialization and pathway evolution, a process still evident in modern proteins.

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    Area of Science:

    • Biochemistry
    • Evolutionary Biology
    • Molecular Evolution

    Background:

    • Ancient cells likely had limited gene content and primitive enzymes.
    • These enzymes exhibited broad substrate specificity and rudimentary regulation.
    • This led to the formation of erroneous products alongside essential metabolites.

    Purpose of the Study:

    • To explore how early cells achieved biochemical flexibility with minimal genetic material.
    • To understand the role of enzyme substrate ambiguity in early metabolism.
    • To examine the evolutionary trajectory of enzyme specialization and pathway development.

    Main Methods:

    • Conceptual analysis of early cellular biochemistry.
    • Hypothetical modeling of enzyme evolution and metabolic pathway recruitment.

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  • Comparative analysis of substrate ambiguity in contemporary proteins.

    • Main Results:

    • Broad substrate ambiguity in primitive enzymes facilitated the fortuitous synthesis of diverse metabolites.
    • This ambiguity provided biochemical flexibility, compensating for limited gene content.
    • Gene duplication allowed for enzyme specialization, enhanced by regulatory mechanisms.
    • Pathway evolution does not necessitate a strictly retrograde progression.

    Conclusions:

    • Substrate ambiguity was a key factor in early cellular adaptation and metabolic innovation.
    • Enzyme specialization through gene duplication and regulation drove evolutionary complexity.
    • The evolutionary exploitation of substrate ambiguity persists in modern biological systems.