Analysis of the Arabidopsis rsr4-1/pdx1-3 mutant reveals the critical function of the PDX1 protein family in metabolism, development, and vitamin B6 biosynthesis.

Full Abstract

Vitamin B6 represents a highly important group of compounds ubiquitous in all living organisms. It has been demonstrated to alleviate oxidative stress and in its phosphorylated form participates as a cofactor in >100 biochemical reactions. By means of a genetic approach, we have identified a novel mutant, rsr4-1 (for reduced sugar response), with aberrant root and leaf growth that requires supplementation of vitamin B6 for normal development. Cloning of the mutated gene revealed that rsr4-1 carries a point mutation in a member of the PDX1/SOR1/SNZ (for Pyridoxine biosynthesis protein 1/Singlet oxygen resistant 1/Snooze) family that leads to reduced vitamin B6 content. Consequently, metabolism is broadly altered, mainly affecting amino acid, raffinose, and shikimate contents and trichloroacetic acid cycle constituents. Yeast two-hybrid and pull-down analyses showed that Arabidopsis thaliana PDX1 proteins can form oligomers. Interestingly, the mutant form of PDX1 has severely reduced capability to oligomerize, potentially suggesting that oligomerization is important for function. In summary, our results demonstrate the critical function of the PDX1 protein family for metabolism, whole-plant development, and vitamin B6 biosynthesis in higher plants.

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Author information

Author/s: Wagner, Susan (S); Bernhardt, Anne (A); Leuendorf, Jan Erik (JE); Drewke, Christel (C); Lytovchenko, Anna (A); Mujahed, Nader (N); Gurgui, Cristian (C); Frommer, Wolf B (WB); Leistner, Eckhard (E); Fernie, Alisdair R (AR); Hellmann, Hanjo (H);

Affiliation: Angewandte Genetik, Freie Universität Berlin, 14195 Berlin, Germany.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.

Journal: The Plant cell (Plant Cell), published in United States. (Language: eng)

Reference: 2006-Jul; vol 18 (issue 7) : pp 1722-35

Dates: Created 2006/06/30; Completed 2007/05/18; Revised 2008/11/20;

PMID: 16766694, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Amino Acid Sequence
Arabidopsis - anatomy & histology; genetics; growth & development; metabolism
Arabidopsis Proteins - chemistry; genetics; metabolism
Chromosomes, Plant
Energy Metabolism
Flowers - anatomy & histology; growth & development
Gene Expression Profiling
Genetic Complementation Test
Molecular Sequence Data
Nitrogenous Group Transferases - chemistry; genetics; metabolism

Nitrogenous Group Transferases - chemistry; genetics; metabolism
Phenotype
Plant Leaves - anatomy & histology; growth & development
Plants, Genetically Modified
Point Mutation
Protein Structure, Quaternary
Pyridoxine - metabolism
Two-Hybrid System Techniques
Vitamin B 6 - biosynthesis
Vitamin B Complex - biosynthesis

Associated Chemicals: Arabidopsis Proteins (0) ; Vitamin B Complex (12001-76-2) ; Pyridoxine (65-23-6) ; Vitamin B 6 (8059-24-3) ; Nitrogenous Group Transferases (EC 2.6.-) ; PDX1 protein, Arabidopsis (EC 2.6.-)

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