Environment affects amino acid preference for secondary structure.

  • Zhong L
  • Johnson W
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Abstract

Three equivocal amino acid sequences were synthesized that are predicted to be alpha-helical from amino acid preference but are found to be primarily beta-strand from x-ray diffraction of their respective proteins. In some solvent systems we recover the alpha-helical structure predicted by amino acid preference, whereas in other systems we mimic the interior of the protein and produce a beta-strand. These results are experimental proof that the environment is important in determining the secondary structure formed by an amino acid sequence; therefore schemes that predict secondary structure from amino acid sequence alone can never be totally successful.

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Authors

  • L. Zhong

  • W. C. Johnson

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