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Caged cysteine and thiophosphoryl peptides

P Pan1, H Bayley

  • 1Worcester Foundation for Biomedical Research, Shrewsbury, MA 01545, USA.

FEBS Letters
|March 17, 1997
PubMed
Summary
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Researchers developed a new method to cage cysteine-containing peptides using 2-nitrobenzyl bromides. This technique allows for controlled release of peptides with near UV light, useful for studying cell signaling pathways.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Photoreleasable molecules are crucial tools for investigating biological processes, particularly cell signaling.
  • Cysteine-containing and thiophosphorylated peptides play significant roles in cellular communication.

Purpose of the Study:

  • To develop a versatile method for 'caging' unprotected cysteine-containing or thiophosphorylated peptides.
  • To enable controlled release of peptides using photolysis for biological studies.
  • To demonstrate selective caging in the presence of multiple reactive sites.

Main Methods:

  • Application of 2-nitrobenzyl bromides to cage peptides in aqueous solution.
  • Photolysis of caged peptides using near UV light.
  • Assessment of uncaging yields and product quantum efficiencies.

Related Experiment Videos

  • Demonstration of selective caging of thiophosphoryl serine over cysteine.

    • Main Results:

    • Achieved successful caging of unprotected cysteine-containing and thiophosphorylated peptides.
    • Photolysis with near UV light yielded uncaged peptides at 55-70% efficiency.
    • Product quantum efficiencies ranged from 0.064-0.62 without damaging other biomolecules.
    • Demonstrated selective caging of thiophosphoryl serine in the presence of cysteine.

    Conclusions:

    • Developed a generally applicable method for photochemically controlling peptide function.
    • The technique is compatible with biological macromolecules and offers selective caging.
    • This approach facilitates functional caging of signal transduction proteins without prior modification.