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Related Experiment Videos

Recognition of signal sequences.

A V Finkelstein, P Bendzko, T A Rapoport

    FEBS Letters
    |September 19, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Hydrophobic sequences in proteins act as signals for membrane translocation. These sequences adopt a uniform conformation within receptor pockets, regardless of their primary structure, facilitating transport across membranes.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Cell Biology

    Background:

    • Protein translocation across membranes is crucial for cellular function.
    • Signal peptides mediate the targeting of proteins to specific cellular compartments.
    • The endoplasmic reticulum and bacterial inner membranes are key sites for protein transport.

    Purpose of the Study:

    • To investigate the role of hydrophobic sequences in protein translocation.
    • To understand the mechanism by which signal peptides interact with translocation receptors.
    • To determine if primary structure diversity affects signal peptide conformation.

    Main Methods:

    • Hypothetical model proposing signal peptide function.
    • Analysis of hydrophobic sequence properties.

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  • Consideration of intramolecular contacts and receptor interactions.

    • Main Results:

    • Continuous, sufficiently long, hydrophobic sequences function as translocation signals.
    • Signal peptides are proposed to immerse into hydrophobic receptor clefts.
    • Entirely nonpolar peptides are absorbed, adopting a conserved conformation.

    Conclusions:

    • Hydrophobicity and length are key features of functional signal peptides.
    • Receptor pocket structure dictates signal peptide conformation, ensuring efficient translocation.
    • This mechanism applies to transport across both endoplasmic reticulum and bacterial inner membranes.