Figure 6From: Highly conserved salt bridge stabilizes a proteinase K subfamily enzyme, Aqualysin I, from Thermus aquaticus YT-1Crystal structures of AQN (a, 4DZT) and VPR (b, 1SH7). The positions of the salt bridges, (a) Arg12-Asp183 of AQN and (b) Arg10-Asp183 of VPR, are represented as stick models. Calcium ions (Ca1 and Ca3) are represented as pale green spheres.Back to article page