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Phosphomannose isomerase (PMI), a key enzyme in mannose (Man) metabolism, is expressed at very low levels in many plant species. For example, measured PMI activity in Nicotiana tabacum (NT1) suspension cells is relatively low, resulting in slow metabolism of Man. Not surprisingly then, NT1 cultures were observed to grow six times faster on glucose (Glc) than on Man as sole carbon source. We report...
NAD-dependent mannitol dehydrogenase (MTD) from celery (Apium graveolens L. var. dulce (Mill.) Pers.) provides the initial step by which mannitol is committed to central metabolism and plays a critical role in regulating mannitol concentration in the plant. The pH optimum for mannitol oxidation occurs at pH 9.5 whereas the optimum for mannose reduction occurs at pH 6.5. Michaelis-Menten kinetics were...
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