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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Transmembrane proteins-Different anchoring systems.

Irena Roterman1, Katarzyna Stapor2, Leszek Konieczny3

  • 1Department of Bioinformatics and Telemedicine, Jagiellonian University-Medical College, Krakow, Poland.

Proteins
|December 8, 2023
PubMed
Summary
This summary is machine-generated.

Transmembrane proteins, crucial for cell transport, utilize specific anchoring systems for stability within membranes. This study reveals how different anchoring mechanisms influence protein flexibility and biological function.

Keywords:
McsC—small conductance mechanosensitive channelhydrophobic environmenthydrophobicityion channelmechano‐sensitive channelmembranetransmembrane proteins

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Protein Dynamics

Background:

  • Transmembrane proteins function in amphipathic cellular environments.
  • Hydrophobic residue exposure is essential for stabilizing these proteins.
  • Transmembrane proteins often form channels facilitating molecular transport.

Purpose of the Study:

  • To analyze the stability and local flexibility of transmembrane proteins.
  • To investigate the role of anchoring systems in protein stabilization.
  • To compare helical and β-barrel transmembrane protein structures.

Main Methods:

  • Utilized the fuzzy oil-drop model (FOD) and its modified version (FOD-M).
  • Analyzed different forms of protein anchorage.
  • Compared stabilization mechanisms of helical and β-barrel structures.

Main Results:

  • Identified distinct forms of transmembrane protein anchorage.
  • Demonstrated that various anchoring systems stabilize protein molecules.
  • Observed possible local fluctuations in stabilized protein structures.

Conclusions:

  • Anchoring systems are critical for transmembrane protein stability in cell membranes.
  • The type of anchorage influences protein local flexibility.
  • Understanding these mechanisms is key to comprehending protein biological activity.