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The three forms of glyceraldehyde-3-phosphate dehydrogenase from Palinurus versicolor muscle, namelyapo native enzyme, apo calboxymethylated enzyme and the enzyme carrying two fluorescent NAD deriva-tives per tetramer have been crystallized. The space groups and unit cell dimensions of these crystals areisomorphous to each other and to those of three corresponding holo-enzymes saturated with NAD~+ reportedin a previous paper suggesting that binding of coenzyme to the apo enzymes does not lead to significantconformational changes involving domain movement as demonstrated in the case of glyceraldehyde-3-phos-phate dehydrogenase from Bacillus stearothermophilus. 相似文献
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本文培养了三种Palinurus versicolor龙虾肌肉D-甘油醛-3-磷酸脱氢酶的晶体:脱辅基酶、脱辅基羧甲基酶和每四体含两个荧光NAD衍生物的酶晶体。用X射线衍射法测定了它们的空间群与晶胞参数。结果表明这些晶体以及对应的为NAD~+所饱和的holo酶晶体彼此同晶,良好的同晶性提示着,此种种属来源的甘油醛-3-磷酸脱氢酶与辅酶的结合不大可能导致如同Bacillus stearothermophillus酶那样涉及结构域相对运动的较大幅度的构象变化。 相似文献
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