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This is one of the beta-hairpins.
4.1. Are the strands parallel or anti-parallel? 4.2. Find 2 amino acids that make 2 H-bonds between them 4.3. Find 2 amino acids that make no H-bonds. 4.4. There is one irregular region. Can you find it? Describe it. What might you call it? 4.5. Ser 10 seems to make only 1 H-bond, but look for its side chain. Could the O make an H-bond to backbone N in another amino acid? Which one? What structural feature of Ser makes this possible? To measure the distance between 2 atoms: Double click on the first atom, then move the pointer to the second atom, and double click again. The distance in Å is shown on the screen. Next: Faces of a beta-sheet
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