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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases

Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases

Published on: November 21, 2010

Structural differences between thermophilic and mesophilic membrane proteins.

Alejandro D Meruelo¹, Seong Kyu Han, Sanguk Kim

¹Medical Scientist Training Program, UCLA-DOE Institute for Genomics and Proteomics, Molecular Biology Institute, UCLA, Los Angeles, California 90095-1570, USA.

Protein Science : a Publication of the Protein Society

|September 25, 2012

Summary

Thermophilic membrane proteins show increased hydrophobicity and reduced polar amino acids for stability at high temperatures. These adaptations help maintain protein structure and function in extreme environments.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Evolutionary adaptations of thermophilic proteins are well-studied, but less is known about membrane proteins.
Understanding these adaptations is crucial for comprehending life's limits and protein function at extreme temperatures.

Purpose of the Study:

To investigate and compare structural and sequence features of mesophilic and thermophilic membrane proteins.
To identify key adaptations in thermophilic membrane proteins that confer stability at high temperatures.

Main Methods:

Comparative analysis of mesophilic and thermophilic membrane protein structures.
Examination of properties such as side-chain burial, packing, hydrogen bonding, kinks, loop lengths, hydrophobicity, and amino acid composition.

Main Results:

Most properties were similar between mesophilic and thermophilic membrane proteins.
Thermophilic proteins exhibited slightly increased side-chain burial and potentially fewer transmembrane kinks.
A significant increase in hydrophobicity of thermophilic transmembrane helices was observed.
Thermophilic proteins showed an increase in small residues (Gly, Ala, Ser, Val) and a decrease in polar residues (Asp, Asn, Glu, Gln, Arg).

Conclusions:

Thermophilic membrane proteins have evolved specific adaptations for high-temperature stability.
Increased hydrophobicity and reduced polar/thermally sensitive amino acids are key evolutionary pressures.
These adaptations likely reduce entropy costs and enhance membrane partitioning at elevated temperatures.