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Related Experiment Videos

Catabolite modulator factor: physiological properties and in vivo effects.

A Dessein, F Tillier, A Ullmann

    Molecular & General Genetics : MGG
    |June 1, 1978
    PubMed
    Summary

    Catabolite modulator factor (CMF) specifically inhibits catabolite repression. This suggests an additional layer of negative control in gene regulation, impacting operon expression.

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    Molecular microbiology·2017

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Gene Regulation

    Background:

    • Catabolite repression is a key mechanism controlling gene expression in bacteria.
    • The precise regulatory networks governing catabolite repression are still under investigation.

    Purpose of the Study:

    • To investigate the function and regulatory role of Catabolite modulator factor (CMF).
    • To elucidate the impact of CMF on catabolite-sensitive and catabolite-independent systems.
    • To explore the relationship between CMF metabolism and the cellular state of catabolite repression.

    Main Methods:

    • Assessing the inhibitory effects of CMF on operon expression.
    • Evaluating CMF metabolism under varying conditions of catabolite repression.
    • Investigating the influence of cyclic AMP (cAMP) on CMF metabolism.
    • Analyzing the response of specific crp mutants to CMF.

    Main Results:

    • CMF specifically inhibits catabolite-repressed operons, leaving catabolite-independent systems unaffected.
    • CMF metabolism rate is inversely proportional to the extent of catabolite repression.
    • Cyclic AMP does not influence CMF metabolism rate.
    • Certain crp mutants exhibit partial resistance to CMF's repressive effects.

    Conclusions:

    • CMF acts as a specific inhibitor of catabolite repression.
    • The findings support the existence of an additional negative control mechanism in catabolite repression regulation.
    • CMF's activity and metabolism are intricately linked to the cell's catabolite regulatory status.

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