1) α-helix; 2) β-strand; 3) β-hairpin; and 4) loop.
Use all 20 amino acid types exactly two times in total to design peptides
that strongly predict to become respectively:
(So you have on average 10 amino acids per element).
That is a big of puzzling, but everybody who learned AMELK, VITWYF, and PSDNG
should be ablr to do this in a few minutes. (An remember the other 4 residu
types can be used everywhere; and remember that some residues (like Leu and Ile,
for example) can be used well in multiple secondary structure types.
This has been an exam question many times, bye the way.