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Related Experiment Videos

Artificial transmembrane segments. Requirements for stop transfer and polypeptide orientation

H Chen1, D A Kendall

  • 1Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269, USA.

The Journal of Biological Chemistry
|June 9, 1995
PubMed
Summary

Researchers converted a water-soluble protein into a transmembrane protein by inserting hydrophobic segments. These segments dictate membrane insertion, translocation, and protein orientation, revealing key requirements for transmembrane protein function.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Protein Engineering

Background:

  • Transmembrane protein segments typically feature hydrophobic amino acids.
  • These segments act as signal-anchor, start-stop, or stop-transfer sequences, directing protein insertion and translocation across membranes.

Purpose of the Study:

  • To investigate the requirements for converting a water-soluble protein into a transmembrane protein.
  • To determine the specific role of hydrophobic segments in protein translocation and orientation.

Main Methods:

  • Utilized cassette mutagenesis to introduce synthetic hydrophobic segments (polymers of alanine and leucine) into Escherichia coli alkaline phosphatase.
  • Examined the function of these segments in initiating or stopping protein translocation and establishing membrane orientation.

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Main Results:

  • Determined the threshold hydrophobicity for a stop-transfer sequence, equivalent to 16 alanines and 5 leucines for a 21-residue segment.
  • Demonstrated that shorter, more hydrophobic segments (e.g., 11 leucines) can also function as stop-transfer sequences.
  • Showed that internal hydrophobic segments can act as signal-anchor sequences, initiating translocation and reversing protein orientation (N(in)-C(out)) when the native signal peptide is absent or dysfunctional.

Conclusions:

  • Hydrophobicity and length of internal segments are critical determinants of transmembrane protein topogenesis.
  • Engineered hydrophobic segments can effectively control protein insertion, translocation, and orientation, offering insights into membrane protein biogenesis.