FIG. 8.

Effects of Li⁺, Na⁺, and K⁺ on the activity of T. maritima I-1-Pase with 2.0 mM I-1-P in 50 mM Tris-HCl (pH 8.0) in the presence of 20 mM MgCl₂ at 95°C for 1 min. Activities were normalized to the value obtained in the assay without the monovalent cation salt added.