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PMID:18394996

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Citation

Tao, Y, Ferrer, JL, Ljung, K, Pojer, F, Hong, F, Long, JA, Li, L, Moreno, JE, Bowman, ME, Ivans, LJ, Cheng, Y, Lim, J, Zhao, Y, Ballaré, CL, Sandberg, G, Noel, JP and Chory, J (2008) Rapid synthesis of auxin via a new tryptophan-dependent pathway is required for shade avoidance in plants. Cell 133:164-76

Abstract

Plants grown at high densities perceive a decrease in the red to far-red (R:FR) ratio of incoming light, resulting from absorption of red light by canopy leaves and reflection of far-red light from neighboring plants. These changes in light quality trigger a series of responses known collectively as the shade avoidance syndrome. During shade avoidance, stems elongate at the expense of leaf and storage organ expansion, branching is inhibited, and flowering is accelerated. We identified several loci in Arabidopsis, mutations in which lead to plants defective in multiple shade avoidance responses. Here we describe TAA1, an aminotransferase, and show that TAA1 catalyzes the formation of indole-3-pyruvic acid (IPA) from L-tryptophan (L-Trp), the first step in a previously proposed, but uncharacterized, auxin biosynthetic pathway. This pathway is rapidly deployed to synthesize auxin at the high levels required to initiate the multiple changes in body plan associated with shade avoidance.

Links

PubMed PMC2442466 Online version:10.1016/j.cell.2008.01.049

Keywords

Amino Acid Sequence; Arabidopsis/genetics; Arabidopsis/physiology; Biosynthetic Pathways; Darkness; Gene Expression Regulation, Plant; Indoleacetic Acids/metabolism; Molecular Sequence Data; Plant Leaves/metabolism; Sequence Alignment; Tryptophan/biosynthesis; Tryptophan/metabolism; Tryptophan Transaminase/chemistry; Tryptophan Transaminase/genetics; Tryptophan Transaminase/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:TAA1

enables

GO:0030170: pyridoxal phosphate binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0004021: L-alanine:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

located_in

GO:0005737: cytoplasm

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0004838: L-tyrosine:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0047312: L-phenylalanine:pyruvate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0050048: L-leucine:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0050362: L-tryptophan:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0080097: L-tryptophan:pyruvate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0080098: L-tyrosine:pyruvate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0080099: L-methionine:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0080100: L-glutamine:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

enables

GO:0080130: L-phenylalanine:2-oxoglutarate aminotransferase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:TAA1

acts_upstream_of_or_within

GO:0048366: leaf development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:TAA1

acts_upstream_of_or_within

GO:0009641: shade avoidance

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:TAA1

acts_upstream_of_or_within

GO:0009684: indoleacetic acid biosynthetic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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