Abstract
A cDNA encoding one of the phenylalanine ammonia-lyase genes from Populus trichocarpa x deltoides was inserted into a baculovirus expression vector and the PAL protein was successfully expressed in insect cell cultures. High levels of active holoenzyme were obtained that could be purified in a single chromatographic step. Site-directed mutagenesis and expression of the mutant enzyme confirmed that conversion of the putative active site serine 202 residue to alanine is sufficient to destroy the catalytic activity of PAL.
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