Abstract
A mutant strain CR-17 ofRhodobacter sphaeroides was characterized by the low activity of 5-aminolevulinic acid dehydratase (ALAD) compared to the wild-type strain. Without addition of levulinic acid (inhibitor of ALAD), the mutant secreted 5-aminolevulinic acid under anaerobic/light (64.5 μM) or under microaerobic/dark (32 μM) conditions; 82.5 μM of ALA was secreted under aerobic/dark condition with addition of 15 mM levulinic acid.
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