title: Cloning and expression of phenylalanine ammonia lyase cDNA in Escherichia coli.
abstract: The phenylalanine ammonia lyase (PAL) cDNA was amplified from Petroselinum crispum RNA by using the RT-PCR technique. The amplified 2.2 kb DNA fragment was sequenced and inserted into expression vector pET23b. The resulting plasmid pET23bPAL was then transformed into E. coli JM109DE3. The expressed PAL protein in JM109DE3 (pET23bPAL) accounted for more than 15% of total proteins in the engineering E. coli cells. The activity and specificity of the expressed PAL was identified and tested by using HPLC technique. The results indicated that the PAL activity was good enough for application to enzymatic therapy of phenylketonurea (PKU).
authors.affiliation: Beijing Red Cross Chaoyang Hospital, China.
authors.forename: L
authors.initials: L
authors.lastname: Jingzhong
authors.forename: X
authors.initials: X
authors.lastname: Hua
authors.forename: H
authors.initials: H
authors.lastname: Wei
authors.forename: Z
authors.initials: Z
authors.lastname: Zhangling
authors.forename: Z
authors.initials: Z
authors.lastname: Jin
authors.forename: L
authors.initials: L
authors.lastname: Qingyuan
mesh_terms: D019661:Apiaceae / Q000201:enzymology* / Q000235:genetics; D003001:Cloning, Molecular; D018076:DNA, Complementary; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000235:genetics*; D015870:Gene Expression; D010650:Phenylalanine Ammonia-Lyase / Q000096:biosynthesis / Q000235:genetics*; D010957:Plasmids; D018749:RNA, Plant; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D018076:DNA, Complementary; D018749:RNA, Plant; D011993:Recombinant Fusion Proteins; D010650:Phenylalanine Ammonia-Lyase