TenI is involved in the thiamin thiazole biosynthesis. In Bacillus subtilis, the thiazole tautomer (R,Z)-2-(2-carboxy-4-methylthiazol-5(2H)-ylidene)ethyl phosphate is formed by an oxidative condensation of glycine, 1-deoxy-D-xylulose-5-phosphate, and cysteine
TenI shows no thiamin phosphate synthase activity, but functionsas a thiazole tautomerase, substrates phosphate and histidine 122 act as the acid/base residues involved in catalysis, reaction mechanism, overview. TenI does not affect glycine oxidase, thiamin phosphate synthase, or ThiS-COSH formation
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enzyme TenI complexed with its reaction product cThz-P bound in the active site, hanging drop vapor diffusion method, liand-free TenI is grown from 1.65 to 1.75 M ammonium sulfate, 100 mM bicine, pH 8.7, 9.6, 2% PEG 400 w/v, and 8 mM L-cysteine, crystals are first dialyzed into 2.38 M sodium malonate, pH 7.0, to remove the sulfate ions by gradually increasing the sodium malonate concentration and decreasing the ammonium sulfate concentration, and soaked overnight in 2.38 M sodium malonate, 21.5 mM bicine, pH 9.0, 0.01% PEG400 w/v, 0.5 mM L-cysteine, 4% glycerol, and 11.5 mM cThz-P, X-ray diffraction structure determination and analysis