SE141:/S1/M2/D1
From Metabolonote
Sample Set Information
ID | TSE1242 |
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Title | Impact of clock-associated Arabidopsis pseudo-response regulators in metabolic coordination. |
Description | In higher plants, the circadian clock controls a wide range of cellular processes such as photosynthesis and stress responses. Understanding metabolic changes in arrhythmic plants and determining output-related function of clock genes would help in elucidating circadian-clock mechanisms underlying plant growth and development. In this work, we investigated physiological relevance of PSEUDO-RESPONSE REGULATORS (PRR 9, 7, and 5) in Arabidopsis thaliana by transcriptomic and metabolomic analyses. Metabolite profiling using gas chromatography-time-of-flight mass spectrometry demonstrated well-differentiated metabolite phenotypes of seven mutants, including two arrhythmic plants with similar morphology, a PRR 9, 7, and 5 triple mutant and a CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1)-overexpressor line. Despite different light and time conditions, the triple mutant exhibited a dramatic increase in intermediates in the tricarboxylic acid cycle. This suggests that proteins PRR 9, 7, and 5 are involved in maintaining mitochondrial homeostasis. Integrated analysis of transcriptomics and metabolomics revealed that PRR 9, 7, and 5 negatively regulate the biosynthetic pathways of chlorophyll, carotenoid and abscisic acid, and alpha-tocopherol, highlighting them as additional outputs of pseudo-response regulators. These findings indicated that mitochondrial functions are coupled with the circadian system in plants. |
Authors | Fukushima A, Kusano M, Nakamichi N, Kobayashi M, Hayashi N, Sakakibara H, Mizuno T, Saito K. |
Reference | Proc Natl Acad Sci U S A. 2009 Apr 28;106(17):7251-6. doi: 10.1073/pnas.0900952106. Epub 2009 Apr 9. Erratum in: Proc Natl Acad Sci U S A. 2009 May 26;106(21):8791. |
Comment |
Sample Information
ID | S1 |
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Title | Plant Materials and Growth Conditions |
Organism - Scientific Name | Arabidopsis thaliana |
Organism - ID | NCBI taxonomy 3702 |
Compound - ID | |
Compound - Source | |
Preparation | A. thaliana accession Columbia (Col-0) was used as a WT plant source. Triple-knockout Arabidopsis mutant prr9-10/prr7-11/prr5-11 has been described in ref. 9. Seedling were grown on Murashige and Skoog (392-00591;Wako) with 0.3% gellan gumand 2% sucrose at pH 5.7 under continuous light (LL) or 12-h light/12-h dark (LD) cycles at 22 °C for 18 days. Whole plants were sampled during days 18–19 to reduce possible developmental effects. |
Sample Preparation Details ID | |
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Analytical Method Information
ID | M2 |
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Title | Design 2 |
Method Details ID | MS1 |
Sample Amount | 167 μg fresh weight of the derivatized extract |
Comment |
Analytical Method Details Information
ID | MS1 |
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Title | GC-TOF MS |
Instrument | GC:Agilent 6890N MS:LECO Pegasus 4D MS system |
Instrument Type | |
Ionization | EI |
Ion Mode | Positive |
Description | Each sample was extracted, derivatized, and analyzed by using gas chromatography–time-of-flight (GC-TOF/MS) as described in ref. 48. See also SI Methods(http://www.pnas.org/cgi/data/0900952106/DCSupplemental/Supplemental_PDF#nameddest=STXT). All the derivatization steps were performed in the vacuum glove box VSC-100 (Sanplatec, Japan) filled with 99.9995% (G3 grade) of dry nitrogen. The analysis of metabolites by GC-TOF/MS was performed as described previously. |
Comment_of_details |
Data Analysis Information
ID | D1 |
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Title | Data Processing |
Data Analysis Details ID | DS1 |
Recommended decimal places of m/z | |
Comment |
Data Analysis Details Information
ID | DS1 |
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Title | Data processing |
Description | Nonprocessed raw data were treated by using a custom script described by Jonsson et al. to perform baseline correction, alignment, and peak deconvolution. Metabolites were identified by comparing their mass spectrum and retention time index (RI) with those generated for authentic compounds analyzed on our instrumentation as well as those in the MS and RI libraries in the Golm Metabolome Database. |
Comment_of_details |