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A malonyl-CoA-binding protein from liver.

R E Dugan, B R Osterlund, R F Drong

    Biochemical and Biophysical Research Communications
    |August 31, 1987
    PubMed
    Summary

    A novel malonyl-CoA-binding protein was isolated from rat liver. This protein competes with fatty acid synthetase, impacting fatty acid synthesis rates and potentially regulating malonyl-CoA-dependent enzymes.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Metabolic Regulation

    Background:

    • Malonyl-CoA is a critical intermediate in fatty acid synthesis.
    • Acetyl-CoA carboxylase (ACC) is the rate-limiting enzyme in fatty acid synthesis.
    • Understanding regulatory mechanisms of ACC and malonyl-CoA is crucial for metabolic research.

    Purpose of the Study:

    • To purify and characterize a novel protein from rat liver that binds malonyl-CoA.
    • To investigate the functional role of this protein in fatty acid synthesis.
    • To assess its impact on enzymatic assays for acetyl-CoA carboxylase.

    Main Methods:

    • Protein purification from rat liver homogenates.
    • Malonyl-CoA binding assays.
    • Enzyme activity assays for acetyl-CoA carboxylase using different methodologies.
    • Determination of protein molecular weight and subunit composition.

    Main Results:

    • A soluble protein that binds malonyl-CoA without cofactors was purified.
    • The protein competes with fatty acid synthetase for malonyl-CoA, inhibiting fatty acid synthesis at low malonyl-CoA concentrations.
    • The protein leads to underestimation of acetyl-CoA carboxylase activity in coupled assays but not in other assay formats.
    • The protein has an Mr of 180,000, with subunits of 90,000, and exhibits lower affinity for ATP, ADP, and acetyl-CoA.

    Conclusions:

    • A novel malonyl-CoA-binding protein from rat liver has been identified and characterized.
    • This protein can modulate fatty acid synthesis rates by competing for malonyl-CoA.
    • The presence of this protein can interfere with specific enzymatic assays for acetyl-CoA carboxylase, necessitating careful assay design.
    • The protein may play a regulatory role in malonyl-CoA metabolism.

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