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Crystal structures of Δ+PHS T62K/V66E at pH = 9 (5KYI) and at pH = 7 (5KYL). The water molecules around the sidechain of E66 are shown as the red balls and the calcium ion near the sidechain of D21 is shown as a green sphere. In 5KYI, water molecule A305 is only 2.41 Å from E66 atom OE2, and in 5KYL, water molecule A332 is only 2.67 Å from E66 atom OE1.
