Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis
Abstract Disposing efficiently and safely chlorophyll derivatives during senescence requires a coordinated pathway that is well conserved throughout green plants. The PAO/phyllobilin pathway catalyzes the degradation of the chlorophyll during senescence and allows detoxification of the pigment and i...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-08-01
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| Series: | Plant Direct |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/pld3.441 |
| _version_ | 1797999773293215744 |
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| author | Mareike Hauenstein Stefan Hörtensteiner Sylvain Aubry |
| author_facet | Mareike Hauenstein Stefan Hörtensteiner Sylvain Aubry |
| author_sort | Mareike Hauenstein |
| collection | DOAJ |
| description | Abstract Disposing efficiently and safely chlorophyll derivatives during senescence requires a coordinated pathway that is well conserved throughout green plants. The PAO/phyllobilin pathway catalyzes the degradation of the chlorophyll during senescence and allows detoxification of the pigment and its subsequent export from the chloroplast. Although most of the chloroplastic reactions involved in chlorophyll degradation are well understood, the diversity of enzymes responsible for downstream modifications of non‐phototoxic phyllobilins remains to be explored. More than 40 phyllobilins have been described to date, but only three enzymes catalyzing side‐chain reactions have been identified in Arabidopsis thaliana, namely, TIC55, CYP89A9, and MES16. Here, by generating a triple mutant, we evaluate the extent to which these enzymes are influencing the rate and amplitude of chlorophyll degradation at the metabolite as well as its regulation at the transcriptome level. Our data show that major side‐chain modifications of phyllobilins do not influence significantly chlorophyll degradation or leaf senescence, letting the physiological relevance of their striking diversity an open question. |
| first_indexed | 2024-04-11T11:10:05Z |
| format | Article |
| id | doaj.art-d27ffba0b8db41d2b9a068d06656308d |
| institution | Directory Open Access Journal |
| issn | 2475-4455 |
| language | English |
| last_indexed | 2024-04-11T11:10:05Z |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Plant Direct |
| spelling | doaj.art-d27ffba0b8db41d2b9a068d06656308d2022-12-22T04:27:57ZengWileyPlant Direct2475-44552022-08-0168n/an/a10.1002/pld3.441Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in ArabidopsisMareike Hauenstein0Stefan Hörtensteiner1Sylvain Aubry2Department of Plant and Microbial Biology University of Zürich Zürich SwitzerlandDepartment of Plant and Microbial Biology University of Zürich Zürich SwitzerlandDepartment of Plant and Microbial Biology University of Zürich Zürich SwitzerlandAbstract Disposing efficiently and safely chlorophyll derivatives during senescence requires a coordinated pathway that is well conserved throughout green plants. The PAO/phyllobilin pathway catalyzes the degradation of the chlorophyll during senescence and allows detoxification of the pigment and its subsequent export from the chloroplast. Although most of the chloroplastic reactions involved in chlorophyll degradation are well understood, the diversity of enzymes responsible for downstream modifications of non‐phototoxic phyllobilins remains to be explored. More than 40 phyllobilins have been described to date, but only three enzymes catalyzing side‐chain reactions have been identified in Arabidopsis thaliana, namely, TIC55, CYP89A9, and MES16. Here, by generating a triple mutant, we evaluate the extent to which these enzymes are influencing the rate and amplitude of chlorophyll degradation at the metabolite as well as its regulation at the transcriptome level. Our data show that major side‐chain modifications of phyllobilins do not influence significantly chlorophyll degradation or leaf senescence, letting the physiological relevance of their striking diversity an open question.https://doi.org/10.1002/pld3.441Arabidopsis thalianachlorophyllCYP89A9MES16phyllobilinssenescence |
| spellingShingle | Mareike Hauenstein Stefan Hörtensteiner Sylvain Aubry Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis Plant Direct Arabidopsis thaliana chlorophyll CYP89A9 MES16 phyllobilins senescence |
| title | Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis |
| title_full | Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis |
| title_fullStr | Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis |
| title_full_unstemmed | Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis |
| title_short | Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in Arabidopsis |
| title_sort | side chain modifications of phyllobilins may not be essential for chlorophyll degradation in arabidopsis |
| topic | Arabidopsis thaliana chlorophyll CYP89A9 MES16 phyllobilins senescence |
| url | https://doi.org/10.1002/pld3.441 |
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