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Decoding signals for membrane protein assembly using alkaline phosphatase fusions.

K McGovern1, M Ehrmann, J Beckwith

  • 1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115.

The EMBO Journal
|October 1, 1991
PubMed
Summary

Cytoplasmic domains of the bacterial protein MalF act as primary topogenic signals, dictating protein topology and membrane segment orientation. Their strength correlates with positive amino acid density.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Understanding protein topology in the bacterial cytoplasmic membrane is crucial for cellular function.
  • The MalF protein is a key component of the bacterial maltose transporter system.

Purpose of the Study:

  • To investigate the role of different domains within the MalF protein in determining its membrane topology.
  • To identify specific topogenic signals responsible for orienting membrane-spanning segments.

Main Methods:

  • Utilized genetic methods to analyze MalF topology.
  • Employed MalF-alkaline phosphatase fusion proteins to assess domain effects on topology.
  • Investigated the impact of deleting various MalF domains.

Main Results:

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  • Cytoplasmic domains of MalF serve as the primary topogenic signals.
  • These domains contain information dictating their cytoplasmic localization and the orientation of adjacent membrane-spanning segments.
  • Periplasmic domains and membrane-spanning segments lack equivalent topogenic information.

Conclusions:

  • Cytoplasmic domains are essential for establishing and maintaining MalF protein topology.
  • The density of positively charged amino acids within cytoplasmic domains correlates with their strength as topogenic signals.
  • This study elucidates the molecular mechanisms governing bacterial membrane protein topology.