Figure 2.

Similarity between the internal water network of Maxi and the {100} planes of sII gas hydrate. (A) Structure of {100} planes of type II gas hydrate with waters (red spheres) and hydrogen bonds (black dashed lines). Waters defining one repeating unit on the plane are colored in cyan and included in the green rectangle. The distance between the equivalent waters is shown. There are four types of grooves on the planes; one example for grooves 1, 2, 3, and 4 is shown such that the water rings forming them are labeled with the same number. (B) Intrachain water sheet of Maxi (side view). Notations are the same as in (A). Ice-binding residues of Maxi forming close contacts with each other are shown as sticks. The region highlighted by the purple square is similar to the plane of the gas hydrate. (C) Superimposition of a portion of HLR on the {100} planes of sII gas hydrate. Waters in the intrachain sheet (red spheres) and their hydrogen bonds (green dashed lines) are distinguished from hydrate waters (cyan spheres) and their hydrogen bonds (black dashed lines). The HLR is delineated by the purple lines. To see this figure in color, go online.