Structure and Properties of Peptides
Hydrogen bonds in a-helices are

not present at Phe residues
more numerous than Vander Waals interactions
roughly parallel to the helix axis
analogous to the steps in a spiral staircase

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Structure and Properties of Peptides
In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

two nitrogens of heme and to three His residues in Hb
four nitrogens of heme, the proximal His, and a water molecule
four nitrogens of heme and to a water molecule
two nitrogens of heme and to three water molecules

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