Abstract
The metabolism of D- and L-p-fluorophenylalanine (PFP) in DL-PFP resistant and sensitive tobacco cell cultures (Nicotiana tabacum), cell lines TX4 and TX1, respectively, has been compared. The amino acid analogue was taken up at a lower rate by the resistant cell line TX4. Incorporation of PFP into protein was also considerably reduced in TX4 cells, compared to TX1 cells. This, however, resulted mainly from a diminished availability of PFP due to a more rapid conversion of PFP by TX4 cells. TX1 cells and TX4 cells converted PFP qualitatively in the same way. The only detectable metabolite of D-PFP was N-malonyl-D-PFP, while all metabolites of L-PFP were identified as sequent products of the initial deamination of L-PFP by the enzyme phenylalanine ammonia-lyase (PAL). As TX4 cells were endowed with higher PAL-activity than TX1 cells, the resistant cells were able to metabolize L-PFP more rapidly to give, e.g., p-fluorocinnamoyl glucose ester and p-fluorocinnamoyl putrescine. In the presence of the specific PAL-inhibitor α-aminooxy-β-phenylpropionic acid TX4 cells were slightly more sensitive to PFP. This suggests that the better “detoxification” contributes to the acquired resistance. The use of PFP as specific indicator for cell lines with increased PAL-activity, and hence increased levels of phenolic compounds, is discussed.
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Abbreviations
- AOPP:
-
α-aminooxy-β-phenylpropionic acid
- MCW:
-
methanol:chloroform:water
- PAL:
-
phenylalanine ammonia-lyase
- PFP:
-
p-fluorophenylalanine
- Phe:
-
phenylalanine
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Berlin, J., Witte, L., Hammer, J. et al. Metabolism of p-fluorophenylalanine in p-fluorophenylalanine sensitive and resistant tobacco cell cultures. Planta 155, 244–250 (1982). https://doi.org/10.1007/BF00392723
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DOI: https://doi.org/10.1007/BF00392723