Radius of gyration as an indicator of protein structure compactness |
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Authors: | M Yu Lobanov N S Bogatyreva O V Galzitskaya |
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Institution: | (1) Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow region, 142290, Russia |
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Abstract: | Identification and study of the main principles underlying the kinetics and thermodynamics of protein folding generate a new insight into the factors that control this process. Statistical analysis of the radius of gyration for 3769 protein domains of four major classes (α, β, α/β, and α + β) showed that each class has a characteristic radius of gyration that determines the protein structure compactness. For instance, α proteins have the highest radius of gyration throughout the protein size range considered, suggesting a less tight packing as compared with β-and (α + β)-proteins. The lowest radius of gyration and, accordingly, the tightest packing are characteristic of α/β-proteins. The protein radius of gyration normalized by the radius of gyration of a ball with the same volume is independent of the protein size, in contrast to compactness and the number of contacts per residue. |
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Keywords: | structural class of proteins contact density compactness all-or-none simple folding mechanism complex folding mechanism with accumulation of intermediate state |
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