title: Regulation of phenylalanine ammonia-lyase activity in cell-suspension cultures of Petroselinum hortense. Apparent rates of enzyme synthesis and degradation.
abstract: The time courses for induced changes in the phenylalanine ammonia-lyase activity at five different stages during the growth cycle of cell-suspension cultures from parsley (Petroselinum hortense Hoffm.) were investigated. Large increases in the enzyme activity, induced either by irradiation or by dilution of a cell culture into fresh medium, were followed by an expotential decline to the initial low level. The maximum inducible level of specific enzyme activity varied within a range of about six-fold, depending on the mode of induction and the growth stage of the cell culture.
mesh_terms: D000642:Ammonia-Lyases / Q000378:metabolism*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D003609:Dactinomycin / Q000494:pharmacology; D004790:Enzyme Induction; D008027:Light; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism*; D010944:Plants / Q000187:drug effects / Q000201:enzymology*
chemical_list: D003609:Dactinomycin; D000642:Ammonia-Lyases; D010650:Phenylalanine Ammonia-Lyase