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- W2004175178 abstract "It has been shown that the propensity of a protein to form amyloid-like fibrils can be predicted with high accuracy from the knowledge of its amino acid sequence. It has also been suggested, however, that some regions of the sequences are more important than others in determining the aggregation process. Here, we have addressed this issue by constructing a set of “sequence scrambled” variants of the first 29 residues of horse heart apomyoglobin (apoMb1-29), in which the sequence was modified while maintaining the same amino acid composition. The clustering of the most amyloidogenic residues in one region of the sequence was found to cause a marked increase of the elongation rate (kagg) and a remarkable shortening of the lag phase (tlag) of the fibril growth, as determined by far-UV circular dichroism and thioflavin T fluorescence. We also show that taking explicitly into consideration the presence of aggregation-promoting regions in the predictive methods results in a quantitative agreement between the theoretical and observed kagg and tlag values of the apoMb1-29 variants. These results, together with a comparison between homologous segments from the family of globins, indicate the existence of a negative selection against the clustering of highly amyloidogenic residues in one or few regions of polypeptide sequences." @default.
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- W2004175178 date "2007-12-01" @default.
- W2004175178 modified "2023-10-14" @default.
- W2004175178 title "The Distribution of Residues in a Polypeptide Sequence Is a Determinant of Aggregation Optimized by Evolution" @default.
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- W2004175178 doi "https://doi.org/10.1529/biophysj.107.111336" @default.
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