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Results 1 - 6 of 6
EC Number
Crystallization
Reference
apo-form of enzyme without bound pyridoxal 5’-phosphate but with two bound sulfate ions, hanging drop vapor diffusion method; strong crystal contacts occur on the flat surface of the protein and that the size of crystal contact surface seems to correlate with the diffraction quality of the crystal. The tryptophanase structure, solved in its apo form, does not have covalent PLP bound in the active site, but two sulfate ions. The sulfate ions occupy the phosphoryl-binding site of PLP and the binding site of the alpha-carboxyl of the natural substrate tryptophan. One of the sulfate ions makes extensive interactions with both the transferase and PLP-binding domains of the protein and appears to be responsible for holding the enzyme in its closed conformation
apo-form of the enzyme, hanging drop vapor diffusion method
crystallized in the apo form by the hanging-drop vapour-diffusion method using polyethylene glycol 400 as a precipitant and magnesium chloride as an additive. The crystals belong to the orthorhombic space group F222, with unit-cell parameters a = 118.4 A, b = 120.1 A, c = 171.2 A. Contains a monomer in the asymmetric unit with a solvent content of 55%. Tryptophanase mutants W330F and Y74F are crystallized under the same conditions and the crystals diffracted to a resolution limit of 1.9 A
in complex with oxindolyl-L-alanine and with L-tryptophan and L-serine
mutant enzymes Y74F and C298S, hanging drop vapor diffusion method, using 30% (w/v) PEG 400, 100 mM HEPES pH 7.5, 200 mM MgCl2, 5 mM 2-mercaptoethanol
Results 1 - 6 of 6