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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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[Multifunctional protein complex NAC (nascent polypeptide associated complex].

G L Kogan, V A Gvozdev

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    This summary is machine-generated.

    The Nascent polypeptide-Associated Complex (NAC) is a crucial protein complex found in all eukaryotes. It protects nascent polypeptides, aids in protein folding, and regulates gene expression, highlighting its diverse biological roles.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Genetics

    Background:

    • The Nascent polypeptide-Associated Complex (NAC) is an evolutionarily conserved, heterodimeric protein complex composed of alpha and beta subunits.
    • NAC is ubiquitously found in eukaryotes, reversibly bound to ribosomes, and plays a role in early protein synthesis and folding.
    • Its involvement in critical cellular processes suggests a broader range of functions beyond its canonical role.

    Purpose of the Study:

    • To comprehensively discuss the multifaceted functions of the NAC complex and its subunits.
    • To explore NAC's roles in protein folding, secretion, ribosome biogenesis, and apoptosis.
    • To highlight NAC as a prime example of a moonlighting protein with diverse biological activities.

    Main Methods:

    • Review and synthesis of existing literature on NAC structure, function, and genetic studies.
    • Analysis of gene mutations and deletions affecting NAC subunits in multicellular eukaryotes.
    • Examination of the evolutionary dynamics of NAC beta-subunits and their functional implications.

    Main Results:

    • NAC protects nascent polypeptides from proteolysis, assists in folding, and modulates protein secretion and transmembrane protein formation.
    • Mutations in NAC subunit genes are lethal during early development, underscoring its essentiality.
    • The NAC beta-subunit interacts with caspase-3, implicating NAC in apoptosis regulation, while the alpha-subunit homodimer functions as an RNA/DNA-binding transcriptional cofactor.

    Conclusions:

    • NAC acts as a chaperone complex, responding to cellular stress and regulating apoptosis.
    • Rapid evolution of beta-subunits leads to tissue-specific variants with altered caspase cleavage sites.
    • NAC exemplifies a moonlighting protein, performing diverse functions essential for cellular and organismal integrity.