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Related Experiment Videos

Structural determinants for signal sequence function in the mammalian endoplasmic reticulum.

T Zheng1, C V Nicchitta

  • 1Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.

The Journal of Biological Chemistry
|December 14, 1999
PubMed
Summary

Altering the LamB signal peptide sequence enhanced protein translocation across the endoplasmic reticulum membrane. This suggests the signal recognition particle (SRP) acts as a chaperone, maintaining signal sequences in a translocation-competent conformation.

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Area of Science:

  • Molecular Biology
  • Protein Trafficking
  • Cellular Biology

Background:

  • Signal sequences are crucial for directing proteins to the endoplasmic reticulum membrane.
  • Understanding signal sequence structure is key to elucidating protein targeting mechanisms.

Purpose of the Study:

  • To investigate the structural requirements for effective signal sequence function in protein translocation.
  • To explore the role of signal sequence conformation in interaction with the signal recognition particle (SRP) and membrane proteins.

Main Methods:

  • Construction of chimeric proteins using the Escherichia coli LamB signal peptide and prolactin.
  • In vitro analysis of protein targeting and translocation using rough microsomes.
  • Site-directed mutagenesis to create a gain-of-function LamB mutant (LamB*).

Related Experiment Videos

  • Cross-linking studies to assess protein-protein interactions.

    • Main Results:

    • The LamB signal peptide mediated SRP-dependent targeting but showed low translocation efficiency.
    • A modified LamB* signal sequence with increased leucine residues achieved full translocation activity.
    • LamB* exhibited enhanced interactions with SRP and integral membrane proteins.
    • Denatured precursors showed salt-resistant binding, unlike de novo synthesized precursors.

    Conclusions:

    • A leucine-rich signal sequence is essential for optimal interaction with SRP.
    • SRP may function as a chaperone by maintaining signal sequences in a translocation-ready conformation.
    • Signal sequence conformation during synthesis influences translocation efficiency.