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hanging drop vapor diffusion method, 1.0 and 2.2 A. Crystal structures of the enzyme both in the unliganded state and bound to 4-chlorobenzoate. The space group is P3(1)21 or P3(2)21 with a = b = 129.3 A, c = 71.5 A
purified recombinant CBL bound to 4-chlorobenzoyl-AMP, hanging drop vapor diffusion at 4°C using 16-24% pentaerythritol propoxylate 426, and 0.1 M K+-HEPES, pH 6.5 or 6.75, and optimized via hanging drop vapor diffusion using 14-18% PEG 1000, 50-100 mM magnesium nitrate and 100 mM MOPS, pH 7.0, the cryoprotectant contains 24% pentaerythritol propoxylate 426, 24% ethylene glycol, and 0.1 M K+-HEPES, 1 mM ATP, and 1 mM 4-chlorobenzoate, X-ray diffraction structure determination and analysis at 2.0-2.25 A resolution, molecular replacement
mutant D402P, to 2.6 A resolution, and comparison with wild-type. The C-terminal domain rotates by about 140 degrees between the two states that catalyze the adenylation and thioester-forming half-reactions. The domain rotation is accompanied by a change in the main chain torsional angles of residue D402
crystallization data. Mutant adopts the proposed adenylate-forming conformation with very little change to the overall structure.The ability of the mutant to catalyze the adenylate-forming half-reaction is reduced by about 3fold, catalysis of the second half-reaction is reduced by 4 orders of magnitude