title: Influence of amino acids, organic solvents and surfactants for phenylalanine ammonia lyase activity in recombinant Escherichia coli.
abstract: OBJECTIVE
  To improve phenylalanine ammonia lyase (E.C.4.3.1.5-PAL) activity in recombinant Escherichia coli. Some methods for enrichment of PAL activity in recombinant E. coli JM109 were described. In an effort to create a rich enzyme source these methods would lead to improvements in the production of L-phenylalanine.
  
  
  RESULTS
  The possibilities of enriching PAL activity in recombinant E. coli was investigated by using individual and combinations of amino acids, organic solvents and surfactants. PAL activity was induced by adding combination of L-phenylalanine and L-tyrosine, activities as high as 64.3 U g(-1)of cells were obtained and enzyme activity was enriched by over 3.5-fold in comparison with the control. Permeabilization with cetyl trimethyl ammonium bromide or the acetone significantly enriched cellular PAL activity, which improved over 8.2- and 9.0-fold compared with the control, as high as 148.5 and 164.5 U g(-1)of cells respectively.
  
  
  CONCLUSIONS
  These efforts may provide some effective methods for enhancing L-phenylalanine ammonia lyase activity.
  
  
  CONCLUSIONS
  These approaches for manipulating recombinant E. coli in an effort to create a rich enzyme source would serve as a biotechnologically important protocol for production of L-phenylalanine.
authors.affiliation: Tianjin Key Laboratory of Industry Microbiology, Tianjin University of Science and Technology, Tianjin, China.
authors.forename: J D
authors.initials: JD
authors.lastname: Cui
authors.forename: S R
authors.initials: SR
authors.lastname: Jia
authors.forename: A Y
authors.initials: AY
authors.lastname: Sun
mesh_terms: D000596:Amino Acids / Q000494:pharmacology; D001709:Biotechnology / Q000379:methods*; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D009930:Organic Chemicals / Q000494:pharmacology; D010649:Phenylalanine / Q000096:biosynthesis*; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D012997:Solvents / Q000494:pharmacology; D013501:Surface-Active Agents / Q000494:pharmacology; D014443:Tyrosine / Q000096:biosynthesis*
chemical_list: D000596:Amino Acids; D009930:Organic Chemicals; D011994:Recombinant Proteins; D012997:Solvents; D013501:Surface-Active Agents; D014443:Tyrosine; D010649:Phenylalanine; D010650:Phenylalanine Ammonia-Lyase