Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 352-366 |
| Seitenumfang | 15 |
| Fachzeitschrift | Physiologia plantarum |
| Jahrgang | 157 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - 23 Apr. 2016 |
Abstract
Amino acid catabolism is essential for adjusting pool sizes of free amino acids and takes part in energy production as well as nutrient remobilization. The carbon skeletons are generally converted to precursors or intermediates of the tricarboxylic acid cycle. In the case of cysteine, the reduced sulfur derived from the thiol group also has to be oxidized in order to prevent accumulation to toxic concentrations. Here we present a mitochondrial sulfur catabolic pathway catalyzing the complete oxidation of l-cysteine to pyruvate and thiosulfate. After transamination to 3-mercaptopyruvate, the sulfhydryl group from l-cysteine is transferred to glutathione by sulfurtransferase 1 and oxidized to sulfite by the sulfur dioxygenase ETHE1. Sulfite is then converted to thiosulfate by addition of a second persulfide group by sulfurtransferase 1. This pathway is most relevant during early embryo development and for vegetative growth under light-limiting conditions. Characterization of a double mutant produced from Arabidopsis thaliana T-DNA insertion lines for ETHE1 and sulfurtransferase 1 revealed that an intermediate of the ETHE1 dependent pathway, most likely a persulfide, interferes with amino acid catabolism and induces early senescence.
ASJC Scopus Sachgebiete
- Biochemie, Genetik und Molekularbiologie (insg.)
- Physiologie
- Biochemie, Genetik und Molekularbiologie (insg.)
- Genetik
- Agrar- und Biowissenschaften (insg.)
- Pflanzenkunde
- Biochemie, Genetik und Molekularbiologie (insg.)
- Zellbiologie
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in: Physiologia plantarum, Jahrgang 157, Nr. 3, 23.04.2016, S. 352-366.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Dealing with the sulfur part of cysteine
T2 - four enzymaticsteps degrade L-cysteine to pyruvate and thiosulfate in Arabidopsis mitochondria
AU - Höfler, Saskia
AU - Lorenz, Christin
AU - Busch, Tjorven
AU - Brinkkötter, Mascha
AU - Tohge, Takayuki
AU - Fernie, Alisdair R.
AU - Braun, Hans Peter
AU - Hildebrandt, Tatjana M.
PY - 2016/4/23
Y1 - 2016/4/23
N2 - Amino acid catabolism is essential for adjusting pool sizes of free amino acids and takes part in energy production as well as nutrient remobilization. The carbon skeletons are generally converted to precursors or intermediates of the tricarboxylic acid cycle. In the case of cysteine, the reduced sulfur derived from the thiol group also has to be oxidized in order to prevent accumulation to toxic concentrations. Here we present a mitochondrial sulfur catabolic pathway catalyzing the complete oxidation of l-cysteine to pyruvate and thiosulfate. After transamination to 3-mercaptopyruvate, the sulfhydryl group from l-cysteine is transferred to glutathione by sulfurtransferase 1 and oxidized to sulfite by the sulfur dioxygenase ETHE1. Sulfite is then converted to thiosulfate by addition of a second persulfide group by sulfurtransferase 1. This pathway is most relevant during early embryo development and for vegetative growth under light-limiting conditions. Characterization of a double mutant produced from Arabidopsis thaliana T-DNA insertion lines for ETHE1 and sulfurtransferase 1 revealed that an intermediate of the ETHE1 dependent pathway, most likely a persulfide, interferes with amino acid catabolism and induces early senescence.
AB - Amino acid catabolism is essential for adjusting pool sizes of free amino acids and takes part in energy production as well as nutrient remobilization. The carbon skeletons are generally converted to precursors or intermediates of the tricarboxylic acid cycle. In the case of cysteine, the reduced sulfur derived from the thiol group also has to be oxidized in order to prevent accumulation to toxic concentrations. Here we present a mitochondrial sulfur catabolic pathway catalyzing the complete oxidation of l-cysteine to pyruvate and thiosulfate. After transamination to 3-mercaptopyruvate, the sulfhydryl group from l-cysteine is transferred to glutathione by sulfurtransferase 1 and oxidized to sulfite by the sulfur dioxygenase ETHE1. Sulfite is then converted to thiosulfate by addition of a second persulfide group by sulfurtransferase 1. This pathway is most relevant during early embryo development and for vegetative growth under light-limiting conditions. Characterization of a double mutant produced from Arabidopsis thaliana T-DNA insertion lines for ETHE1 and sulfurtransferase 1 revealed that an intermediate of the ETHE1 dependent pathway, most likely a persulfide, interferes with amino acid catabolism and induces early senescence.
UR - http://www.scopus.com/inward/record.url?scp=85027956834&partnerID=8YFLogxK
U2 - 10.1111/ppl.12454
DO - 10.1111/ppl.12454
M3 - Article
C2 - 27105581
AN - SCOPUS:85027956834
VL - 157
SP - 352
EP - 366
JO - Physiologia plantarum
JF - Physiologia plantarum
SN - 0031-9317
IS - 3
ER -