| 21. | This activity is often found in a bifunctional enzyme with xanthine oxidase ( ) activity too.
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| 22. | Yerba mate contains three xanthines : caffeine, theobromine and theophylline, the main one being caffeine.
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| 23. | Xanthine dehydrogenase can be converted to xanthine oxidase by reversible sulfhydryl oxidation or by irreversible proteolytic modification.
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| 24. | Xanthine dehydrogenase can be converted to xanthine oxidase by reversible sulfhydryl oxidation or by irreversible proteolytic modification.
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| 25. | Xanthine dehydrogenase belongs to the group of molybdenum-containing hydroxylases involved in the oxidative metabolism of purines.
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| 26. | Tea also contains small amounts of theobromine and theophylline, which are stimulants, and xanthines similar to caffeine.
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| 27. | "' Caffeine "'is a xanthine alkaloid compound that acts as a stimulant in humans.
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| 28. | Enzymes that contain the molybdopterin cofactor include xanthine oxidase, DMSO reductase, sulfite oxidase, and nitrate reductase.
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| 29. | However, the inhibitory effect of xanthines on phosphodiesterases are only seen at dosages higher than what people normally consume.
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| 30. | The " xpt " gene encodes a specific xanthine phosphoribosyltransferase protein, which is involved in purine metabolism.
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