Figure 6
Intermolecular interactions between Hb and the phthalide compounds. (a) z-butylidenephthalide (b) z-ligustilide (c) senkyunolide A (d) senkyunolide I identified from the flexible docking modeling. The new hydrogen bonds formed between Hb and the phthalide molecule are expressed as red dashed lines, while the hydrogen bonds that already exist are shown as green dashed lines. The bond distance is specified in Å. Color code: the backbone of all phthalides (green), α1 subunit and the backbone of its residues (magenta), α2 subunit and the backbone of its residues (light magenta), β1 subunit (light yellow), β2 subunit (orange), oxygen (red), nitrogen (blue) and hydrogen (white). Note that all four phthalide derivative compounds appear to interact with Hb between α1 (magenta) and α2 (light magenta) subunits.
