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Title: Identification of a plastidial phenylalanine exporter that influences flux distribution through the phenylalanine biosynthetic network

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms9142· OSTI ID:1455141
 [1];  [2];  [3];  [1];  [3];  [1];  [4];  [1];  [1];  [5];  [5];  [2];  [6];  [3]
  1. Purdue Univ., West Lafayette, IN (United States). Dept. of Biochemistry
  2. Purdue Univ., West Lafayette, IN (United States). Dept. of Horticulture and Landscape Architecture
  3. Purdue Univ., West Lafayette, IN (United States). Dept. of Biochemistry. Dept. of Horticulture and Landscape Architecture
  4. Purdue Univ., West Lafayette, IN (United States). School of Chemical Engineering
  5. Purdue Univ., West Lafayette, IN (United States). Bioinformatics Core
  6. Purdue Univ., West Lafayette, IN (United States). Dept. of Biochemistry. School of Chemical Engineering

In addition to proteins, L-phenylalanine is a versatile precursor for thousands of plant metabolites. Production of phenylalanine-derived compounds is a complex multi-compartmental process using phenylalanine synthesized predominantly in plastids as precursor. The transporter(s) exporting phenylalanine from plastids, however, remains unknown. Here, a gene encoding a Petunia hybrida plastidial cationic amino-acid transporter (PhpCAT) functioning in plastidial phenylalanine export is identified based on homology to an Escherichia coli phenylalanine transporter and co-expression with phenylalanine metabolic genes. Radiolabel transport assays show that PhpCAT exports all three aromatic amino acids. PhpCAT downregulation and overexpression result in decreased and increased levels, respectively, of phenylalanine-derived volatiles, as well as phenylalanine, tyrosine and their biosynthetic intermediates. Metabolic flux analysis reveals that flux through the plastidial phenylalanine biosynthetic pathway is reduced in PhpCAT RNAi lines, suggesting that the rate of phenylalanine export from plastids contributes to regulating flux through the aromatic amino-acid network.

Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Gordon and Betty Moore Foundation (United States)
Grant/Contract Number:
SC0008628; GBMF2550.02
OSTI ID:
1455141
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Cited By (11)

Staining and Observing Pollen Tubes in the Style by Means of Fluorescence journal January 1959
Drought stress in Pinus taeda L. induces coordinated transcript accumulation of genes involved in the homogentisate pathway journal January 2017
Vitamin E Biosynthesis and Its Regulation in Plants journal December 2017
Whole Plant Temperature Manipulation Affects Flavonoid Metabolism and the Transcriptome of Grapevine Berries journal June 2017
Natural fumigation as a mechanism for volatile transport between flower organs journal May 2019
Source Strength Modulates Fruit Set by Starch Turnover and Export of Both Sucrose and Amino Acids in Pepper journal July 2019
Mutation of the chloroplast‐localized phosphate transporter OsPHT2;1 reduces flavonoid accumulation and UV tolerance in rice journal December 2019
Completion of the cytosolic post-chorismate phenylalanine biosynthetic pathway in plants journal January 2019
Was the Chlamydial Adaptative Strategy to Tryptophan Starvation an Early Determinant of Plastid Endosymbiosis? journal June 2016
Deregulation of phenylalanine biosynthesis evolved with the emergence of vascular plants journal September 2021
Source and sink mechanisms of nitrogen transport and use journal November 2017

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