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Visualization of the structure of cp ATCase and the location of the new termini (N-terminus blue, C-terminus red). The starting methionine was deleted and the subsequent residue exchanged to various amino acids. A, overview of the structure; B–G, position of the termini inside a core structure; B, N-terminus with (wild-type) threonine residue; C–G, N-terminal threonine was changed to large, bulky residues that block the “tunnel” and possibly change the protein structure.
