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Membrane protein (MP) amino acid frequencies systematically change with the number of helices. These patterns reveal distinct assembly principles across eukaryotes and bacteria, offering insights into evolutionary history and protein diversity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Evolutionary Biology

Background:

  • Membrane proteins (MPs) exhibit structural diversity driven by helix-helix interactions.
  • Amino acid composition is a key factor influencing MP structure and function.

Purpose of the Study:

  • To investigate systematic changes in transmembrane amino acid frequencies (f) as a function of the number of helices (n) in MPs.
  • To identify how these trends relate to MP assembly principles and evolutionary history across different taxa.

Main Methods:

  • Analysis of transmembrane amino acid frequencies (f) in relation to the number of helices (n).
  • Comparison of amino acid usage trends between eukaryotic and bacterial membrane proteins.
  • Identification of breaks in frequency trends to delineate distinct MP assembly principles.

Main Results:

  • Eukaryotic MPs show distinct amino acid frequency trends for 2–7, 8–12, and ≥13 helices, indicating different assembly principles.
  • Bacterial MPs exhibit an earlier frequency break after 6 helices, correlating with earlier size distribution peaks and packing interactions.
  • Anti-correlations between packing and polar residues across taxa provide an evolutionary ordering and allow estimations for early life forms.

Conclusions:

  • MP amino acid composition is governed by helix number, evolutionary history, proteome diversity, and amino acid cost.
  • Distinct assembly principles for MPs are revealed by amino acid frequency shifts related to helix count.
  • The study provides a framework for understanding MP evolution and diversity based on amino acid composition.