Figure 4.
(a) Stereoview of a simulated annealing gradient omit map contoured at 2.8σ, in which L-lysine bound in the active site of human arginase I (monomer A) was omitted from the structure factor calculation. Manganese coordination and hydrogen bond interactions are indicated by red and green dashed lines, respectively; atoms are color coded as in Figure 2. (b) Superposition of the human arginase I-L-lysine complex (color coded as in (a)) and the B. caldovelox arginase-L-lysine complex (blue) [36].