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Membrane proteins which exhibit multiple topological orientations

D Levy1

  • 1University of Southern California, School of Medicine, Department of Biochemistry and Molecular Biology, Los Angeles 90033, USA.

Essays in Biochemistry
|January 1, 1996
PubMed
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Membrane protein orientation is determined by topogenic sequences and N-terminal folding. Some proteins exhibit multiple orientations, leading to varied cellular targeting and functions.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Membrane protein folding patterns are classified by orientation and topogenic sequences guiding ER membrane insertion.
  • Protein orientation is influenced by charge distribution and N-terminal folding characteristics.
  • Sequence motifs and oligomerization dictate protein targeting and cellular localization.

Purpose of the Study:

  • To explore the regulatory mechanisms of membrane protein orientation and insertion into the ER membrane.
  • To understand how sequence motifs and protein domains influence protein targeting.
  • To investigate the implications of multiple topological orientations for protein function.

Main Methods:

  • Analysis of topogenic sequences and their role in membrane protein insertion.

Related Experiment Videos

  • Examination of charge distribution and N-terminal domain folding in regulating protein orientation.
  • Investigation of sequence motifs in C- and N-terminal domains and their impact on protein targeting and oligomerization.

    • Main Results:

    • Membrane protein folding patterns are categorized by their orientation and topogenic sequences.
    • Charge distribution and N-terminal folding influence protein orientation within the ER membrane.
    • Proteins like Pgp, ductin, CP450s, and mEH can adopt multiple topological orientations.
    • Multiple orientations lead to targeting to various cellular compartments and diverse biological functions.

    Conclusions:

    • Membrane protein topology is governed by specific sequence elements and folding properties.
    • The ability of certain proteins to adopt multiple orientations expands their functional repertoire.
    • Understanding these mechanisms is crucial for comprehending protein localization and cellular processes.