Figure 3.

Superimposed local structures around the three S···O interactions additionally found in sPLA₂-DG. Pictures were drawn using the structural data of PDB (Table 2) with d_S···O≤0.10 Å. The sulfur, oxygen, nitrogen, and carbon atoms are shown in yellow, red, blue, and black, respectively. The residue numbers of Russell’s viper (r. viper) PLA₂ are indicated. For the other snake PLA₂, the residue numbers may be different (see the footnotes of Table 2). (A) The S(C27)···O(R36) interaction. (B) The S(C44)···O(C105) interaction shown with the bifurcated S(C44)···O(A40) interaction. (C) The S(C50)···O(F46) interaction.