Comparison between the structures of NpAS and DgAS.

a

The 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.

b

The distance cutoff used for the calculation of salt bridges is 3.5 Å.