Fig. 5.

Possible β-serpentines for other proteins. (a) N-domain of Sup35. In the C-terminal portion, the Pro residues in the nine-residue pseudorepeats are assigned to turns. In the N-terminal portion, some hydrophobic residues are assigned to external positions, and they may be more efficiently sequestered by some other serpentine (different turn sites). (b) Poly(PGQ₉). (c) Poly(Q) expansions. Because there are no charged nor Pro residues to punctuate turns, the length of the strands is not well defined: there may be several possibilities.