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Lipids as Anchors

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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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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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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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.
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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AnchorDock: Blind and Flexible Anchor-Driven Peptide Docking.

Avraham Ben-Shimon1, Masha Y Niv1

  • 1Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment and The Fritz Haber Center for Molecular Dynamics, The Hebrew University, Rehovot 76100, Israel.

Structure (London, England : 1993)
|April 28, 2015
PubMed
Summary

AnchorDock is a new computational method that models protein-peptide interactions by predicting peptide binding sites. This approach successfully identifies correct binding poses for peptides, advancing molecular recognition studies.

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Area of Science:

  • Computational biology
  • Structural biology
  • Biophysics

Background:

  • Protein-peptide interactions are crucial in biological processes.
  • Computational modeling of these interactions is challenging due to peptide flexibility.
  • Existing methods often rely on known complex structures.

Purpose of the Study:

  • To introduce AnchorDock, a novel computational approach for peptide docking.
  • To overcome the challenge of peptide conformational flexibility in modeling.
  • To target docking searches to relevant conformational spaces.

Main Methods:

  • Precomputing free peptide structures.
  • Identifying protein surface anchoring spots computationally.
  • Employing anchor-driven simulated annealing molecular dynamics.

Main Results:

  • AnchorDock achieved high accuracy in blind docking tests (backbone RMSD ≤ 2.2Å).
  • Successfully predicted poses for 10 out of 13 unbound cases.
  • Demonstrated effectiveness in challenging docking scenarios.

Conclusions:

  • AnchorDock significantly improves computational modeling of protein-peptide interactions.
  • The method effectively navigates peptide conformational space.
  • Results support a molecular recognition model driven by pre-existing structural elements.