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  • Title: Why Is the C-terminus of Abeta(1-42) more unfolded than that of Abeta(1-40)? Clues from hydrophobic interaction.
    Author: Shen L, Ji HF, Zhang HY.
    Journal: J Phys Chem B; 2008 Mar 13; 112(10):3164-7. PubMed ID: 18278904.
    Abstract:
    Abeta(1-40) and Abeta(1-42) are the main forms of amyloid beta (Abeta) peptides in the brain of Alzheimer's patients; however, the latter possesses much stronger aggregation and deposition propensity than the former, which is partially attributed to the more unfolded C-terminus of Abeta(1-42) than that of Abeta(1-40). To explore the physical basis underlying the different dynamic behaviors of both Abeta peptides, parallel molecular dynamics (MD) simulations on Abeta(1-40) and Abeta(1-42) were performed to investigate their thermal unfolding processes. It is revealed that the addition of residues 41 and 42 in Abeta(1-42) disrupts the C-terminal hydrophobic core, which triggers the unraveling of the C-terminal helix of Abeta(1-42). This conclusion is supported by the MD simulation on the I41A mutant of Abeta(1-42), in which the C-terminal helix possesses relatively higher conformational stability than that of wild type Abeta(1-42) owing to the change in hydrophobic interaction patterns.
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