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• W2080646340 endingPage "3755" @default.
• W2080646340 startingPage "3751" @default.
• W2080646340 abstract "Single and multiple Xaa----Ala substitutions were constructed in the alpha-helix comprising residues 39-50 in bacteriophage T4 lysozyme. The variant with alanines at 10 consecutive positions (A40-49) folds normally and has activity essentially the same as wild type, although it is less stable. The crystal structure of this polyalanine mutant displays no significant change in the main-chain atoms of the helix when compared with the wild-type structure. The individual substitutions of the solvent-exposed residues Asn-40, Ser-44, and Glu-45 with alanine tend to increase the thermostability of the protein, whereas replacements of the buried or partially buried residues Lys-43 and Leu-46 are destabilizing. The melting temperature of the lysozyme in which Lys-43 and Leu-46 are retained and positions 40, 44, 45, 47, and 48 are substituted with alanine (i.e., A40-42/44-45/47-49) is increased by 3.1 degrees C relative to wild type at pH 3.0, but reduced by 1.6 degrees C at pH 6.7. In the case of the charged amino acids Glu-45 and Lys-48, the changes in melting temperature indicate that the putative salt bridge between these two residues contributes essentially nothing to the stability of the protein. The results clearly demonstrate that there is considerable redundancy in the sequence information in the polypeptide chain; not every amino acid is essential for folding. Also, further evidence is provided that the replacement of fully solvent-exposed residues within alpha-helices with alanines may be a general way to increase protein stability. The general approach may permit a simplification of the protein folding problem by retaining only amino acids proven to be essential for folding and replacing the remainder with alanine." @default.
• W2080646340 created "2016-06-24" @default.
• W2080646340 creator A5019903829 @default.
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• W2080646340 date "1992-05-01" @default.
• W2080646340 modified "2023-09-27" @default.
• W2080646340 title "Folding and function of a T4 lysozyme containing 10 consecutive alanines illustrate the redundancy of information in an amino acid sequence." @default.
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• W2080646340 doi "https://doi.org/10.1073/pnas.89.9.3751" @default.
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