Nicotiana tabacum cDNA encoding a bifunctional protein having catalytic domains for dehydroquinase and shikimate dehydrogenase was cloned and sequenced. Complementation of Escherichia coli aroD and aroE auxotrophs was successful. Amino acid sequencing located the N-terminus of the mature protein. The two catalytic domains exhibited greater amino acid identity with prokaryote homologues than with yeast and fungal homologues.

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