Figure 1.

A view of the active site of spinach Rubisco complexed to carboxyarabinitol-P₂ based on the coordinates of the 1.6-Å structure (Andersson, 1996) showing the position of Leu-335. The lower resolution structure of the analogous complex of tobacco Rubisco (Schreuder et al., 1993) appears to be identical in this region. The hollow arrow indicates the carbon atom deleted by the Val substitution. Bound carboxyarabinitol-P₂ and Mg²⁺ are rendered as balls and sticks and amino acid residues as sticks. C, Gray; O, white; N, P, and Mg²⁺, black.