Comparison between the structures of NpAS and DgAS.

aThe distance and the angle cutoffs used for the calculation of H-bonds are 3.0 Å and 150°, respectively. The first number of the content in the bracket is the count of backbone-backbone H-bonds, the second one gives the count for the sidechain-sidechain/backbone H-bonds.bThe distance cutoff used for the calculation of salt bridges is 3.5 Å.

在氢键计算的截断距离和角度方面，分别采用3.0埃和150°。括号内的第一个数字表示骨架-骨架氢键的数量，第二个数字则提供了侧链-侧链/骨架氢键的数量。对于盐桥的计算，采用的截断距离为3.5埃。