Structures of Helical β-Tapes and Twisted Ribbons: The Role of Side-Chain Interactions on Twist and Bend Behavior
Nano Letters2003Vol. 3(11), pp. 1475–1479
Citations Over TimeTop 10% of 2003 papers
Abstract
Molecular Dynamics (MD) simulations have been used to obtain a molecular insight into the origins of the twist, bend, and helix pitch of the tape-like and ribbon (double tape)-like β-sheet aggregates formed by the self-assembling peptides P11-I (CH3CO-QQRQQQQQEQQ-NH2) and P11-II (CH3CO-QQRFQWQFEQQ-NH2). P11-II differs from P11-I in that glutamines at positions 4, 6, and 8 have been substituted for F, W, and F, and this gives rise to left-handed helicoidal tapes having a significantly shorter helix pitch. The presence of these hydrophobic residues also enhances the cross-tape attractive forces in P11-II ribbons, which foreshortens the helix pitch.
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