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Mutagenic substitution of the invariant D42 and D169 residues in phosphoribulokinase (PRK) with amino acids that contain neutral side chains (e.g., alanine or asparagine) results in large decreases in catalytic efficiency (10 5 - and 10 4 -fold for replacement of D42 and D169, respectively). To further evaluate the importance of anionic side chains at residues 42 and 169, substitutions...
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