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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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Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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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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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
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Inter-residue interactions in alpha-helical transmembrane proteins.

Eduardo Mayol1, Mercedes Campillo1, Arnau Cordomí1

  • 1Laboratori de Medicina Computacional, Unitat de Bioestadística, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain.

Bioinformatics (Oxford, England)
|December 20, 2018
PubMed
Summary

This study analyzed inter-residue interactions in 3462 transmembrane helices from 430 alpha-helical membrane proteins. Findings reveal a prevalence of aliphatic and phenylalanine interactions, crucial for understanding membrane protein structure.

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Membrane Protein Research

Background:

  • Increasing availability of membrane protein structures and improved transmembrane segment detection methods.
  • Need for comprehensive analysis of inter-residue interactions within transmembrane segments.

Purpose of the Study:

  • To characterize inter-residue interactions in alpha-helical membrane proteins.
  • To identify patterns and preferences of amino acid interactions within transmembrane segments.
  • To compare these patterns with beta-barrel and globular proteins.

Main Methods:

  • Analysis of a large dataset comprising 3462 transmembrane helices from 430 alpha-helical membrane proteins.
  • Characterization of residue-residue interactions within these transmembrane segments.
  • Comparative analysis with datasets of beta-barrel membrane proteins and alpha-helical globular proteins.

Main Results:

  • Predominance of interactions involving aliphatic residues and phenylalanine (Phe) within transmembrane segments.
  • Limited occurrence of polar-polar, polar-charged, and charged-charged interactions.
  • Specific interactions observed between Thr/Ser sidechains and backbone carbonyls of aliphatic/Phe residues.

Conclusions:

  • The identified interaction patterns are characteristic of alpha-helical membrane proteins.
  • These findings provide insights into amino acid preferences for membrane core or lipid bilayer exposure.
  • Understanding these specific interaction patterns is key to deciphering alpha-helical membrane protein structure.