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Enzymes serving as respiratory complex II belong to the succinate:quinone oxidoreductases superfamily that comprises succinate:quinone reductases (SQRs) and quinol:fumarate reductases. The SQR from the extreme thermophile Thermus thermophilus has been isolated, identified and purified to homogeneity. It consists of four polypeptides with apparent molecular masses of 64, 27, 14 and 15kDa, corresponding...
The oxygenase HpaB is a component of the 4‐hydroxyphenylacetate 3‐monooxygenase enzyme that is responsible for the hydroxylation of 4‐hydroxyphenylacetate. It utilizes molecular oxygen and a reduced flavin, which is provided by HpaC, the second component of the enzyme. While isolating integral membrane respiratory complexes from Thermus thermophilus, microcrystals of HpaB were formed. Further purification...
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