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Figure 5.
Figure 5. Examples of hydration structure in the (a) Gly!Ala structure (b) PPG 1 or PPG 2 and (c) PPG 0 struc-
tures. In (a) and (b) two water molecules are bound to the carbonyl group of the Y position proline residue (WA and
WN) and one water molecule is bound to the glycine carbonyl group (WN). In (a) two additional water molecules are
bound to O
d
of the hydroxyproline residue. Inter- and intrachain water bridges are then formed by interconnecting
water molecules. In general, the water structure of PPG shows repetitive pentagonal-like inter and intrachain bridges
between carbonyl groups. In (c) two water molecules, W1 and W2, are bound to the carbonyl group of the Y position
proline residue. W1 is also bound to the glycine carbonyl group, forming a one water molecule intrachain bridge. W1
and W2 are connected by W3, forming a three water molecule interchain bridge similar to that seen in (a) and (b).
The Figure was generated with MOLSCRIPT (Kraulis, 1991).
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