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Characterization of rice tryptophan decarboxylases and their direct involvement in serotonin biosynthesis in transgenic rice

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Abstract

l-Tryptophan decarboxylase (TDC) and l-tyrosine decarboxylase (TYDC) belong to a family of aromatic l-amino acid decarboxylases and catalyze the conversion of tryptophan and tyrosine into tryptamine and tyramine, respectively. The rice genome has been shown to contain seven TDC or TYDC-like genes. Three of these genes for which cDNA clones were available were characterized to assign their functions using heterologous expression in Escherichia coli and rice (Oryza sativa cv. Dongjin). The purified products of two of the genes were expressed in E. coli and exhibited TDC activity, whereas the remaining gene could not be expressed in E. coli. The recombinant TDC protein with the greatest TDC activity showed a K m of 0.69 mM for tryptophan, and its activity was not inhibited by phenylalanine or tyrosine, indicating a high level of substrate specificity toward tryptophan. The ectopic expression of the three cDNA clones in rice led to the abundant production of the products of the encoded enzymes, tyramine and tryptamine. The overproduction of TYDC resulted in stunted growth and a lack of seed production due to tyramine accumulation, which increased as the plant aged. In contrast, transgenic plants that produced TDC showed a normal phenotype and contained 25-fold and 11-fold higher serotonin in the leaves and seeds, respectively, than the wild-type plants. The overproduction of either tyramine or serotonin was not strongly related to the enhanced synthesis of tyramine or serotonin derivatives, such as feruloyltyramine and feruloylserotonin, which are secondary metabolites that act as phytoalexins in plants.

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Abbreviations

TDC:

l-Tryptophan decarboxylase

TYDC:

l-Tyrosine decarboxylase

HPLC:

High performance liquid chromatography

AADCs:

Aromatic l-amino acid decarboxylases

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Acknowledgments

We gratefully acknowledge Dr. Atsushi Ishihara for providing authentic feruloylserotonin and 4-coumaroylserotonin. This work was supported by the SRC program of MOST/KOSEF through the Agricultural Plant Stress Research Center (R11-2001-092-03001-0).

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Authors and Affiliations

  1. Department of Molecular Biotechnology, Agricultural Plant Stress Research Center, Biotechnology Research Institute, Chonnam National University, Gwangju, 500-757, South Korea

    Sei Kang, Kiyoon Kang, Kyungjin Lee & Kyoungwhan Back

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  1. Sei Kang
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  2. Kiyoon Kang
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  3. Kyungjin Lee
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  4. Kyoungwhan Back
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Correspondence to Kyoungwhan Back.

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Kang, S., Kang, K., Lee, K. et al. Characterization of rice tryptophan decarboxylases and their direct involvement in serotonin biosynthesis in transgenic rice. Planta 227, 263–272 (2007). https://doi.org/10.1007/s00425-007-0614-z

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