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pubmed-article:9008393pubmed:abstractTextA full-length cDNA encoding phenylalanine ammonia-lyase (PAL) from Zea mays L. was isolated and the coding region was expressed in Escherichia coli as a C-terminal fusion to glutathione S-transferase. After purification by glutathione-Sepharose chromatography, the glutathione S-transferase moiety was cleaved off and the resulting PAL enzyme analyzed. In contrast to PAL from dicots, this maize PAL isozyme catalyzed the deamination of both L-phenylalanine (PAL activity) and L-tyrosine (tyrosine ammonia-lyase activity). These results provide unequivocal proof that PAL and tyrosine ammonia-lyase activities reside in the same polypeptide. In spite of large differences in the Michaelis constant and turnover number of the two activities, their catalytic efficiencies are very similar. Also, both activities have the same pH and temperature optima. These results imply that maize can produce p-coumaric acid from both phenylalanine and tyrosine.lld:pubmed
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pubmed-article:9008393pubmed:articleTitleMaize phenylalanine ammonia-lyase has tyrosine ammonia-lyase activity.lld:pubmed
pubmed-article:9008393pubmed:affiliationInstitute of Plant Sciences, Swiss Federal Institute of Technology, Zurich, Switzerland.lld:pubmed
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