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Chapter 6 : Temperature-Dependent Molecular Adaptation Features in Proteins

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Abstract:

This chapter compares and reviews the molecular adaptations shown by thermophilic and psychrophilic proteins. At both high and low temperatures, the proteins need to be active to maintain the cellular machinery in functional state. The proteins appear to achieve this by modulating their conformational stability/flexibility. The overall fold appears to remain conserved among the homologous thermophilic, mesophilic, and psychrophilic proteins, and only rather minor adjustments are required for adaptation of the protein to high and low temperatures. Thermophilic proteins have specific amino acid composition requirements. In general, thermophilic proteins favor charged residues (Glu, Arg, and Lys) capable of providing increased formation of the ion pairs and their networks. Surface loops in the thermophilic proteins may be undesirable due to the increased mobility at high temperatures. Psychrophilic proteins have high specific activities, yet their thermal stabilities are relatively low. Psychrophilic proteins are often more flexible, particularly, in the regions near the active sites. That proteins could adapt to the diverse living temperatures of their source organisms by modulating the electrostatic effects came to light from studies on citrate synthase.

Citation: Kumar S, Arya S, Nussinov R. 2007. Temperature-Dependent Molecular Adaptation Features in Proteins, p 75-85. In Gerday C, Glansdorff N (ed), Physiology and Biochemistry of Extremophiles. ASM Press, Washington, DC. doi: 10.1128/9781555815813.ch6

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Aeropyrum pernix
0.4827499
Pyrobaculum aerophilum
0.4827499
Protein Folding
0.4827499
Thermotoga maritima
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Core Protein
0.4735171
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