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biotechnology
conversion of aminodeoxychorismate synthase into anthranilate synthase employing a bioinformatics method for predicting mutations required to functionally interconvert homologous enzymes. Complementation of an anthranilate synthase-deficient strain of Escherichia coli grown on minimal medium leads to several aminodeoxychorismate synthase mutants that allow growth in 6 days compared to 2 days for wild-type anthranilate synthase. The purified mutant enzymes catalyze the conversion of chorismate to anthranilate at rates that are about 50% of the rate of wild-type aminodeoxychorismate synthase-catalyzed conversion of chorismate to aminodeoxychorismate. The residues mutated do not contact the substrate
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