Two alanine aminotranferases link mitochondrial glycolate oxidation to the major photorespiratory pathway in Arabidopsis and rice

The major photorespiratory pathway in higher plants is distributed over chloroplasts, mitochondria, and peroxisomes. In this pathway, glycolate oxidation takes place in peroxisomes. It was previously suggested that a mitochondrial glycolate dehydrogenase (GlcDH) that was conserved from green algae l...

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Veröffentlicht in:Journal of experimental botany. - 1985. - 63(2012), 7 vom: 01. Apr., Seite 2705-16
1. Verfasser: Niessen, Markus (VerfasserIn)
Weitere Verfasser: Krause, Katrin, Horst, Ina, Staebler, Norma, Klaus, Stephanie, Gaertner, Stefanie, Kebeish, Rashad, Araujo, Wagner L, Fernie, Alisdair R, Peterhansel, Christoph
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2012
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Glycolates Plant Proteins glycolic acid 0WT12SX38S Carbon Dioxide 142M471B3J Oxidoreductases EC 1.- mehr... Alanine Transaminase EC 2.6.1.2 Glycine TE7660XO1C
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100 1 |a Niessen, Markus  |e verfasserin  |4 aut 
245 1 0 |a Two alanine aminotranferases link mitochondrial glycolate oxidation to the major photorespiratory pathway in Arabidopsis and rice 
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520 |a The major photorespiratory pathway in higher plants is distributed over chloroplasts, mitochondria, and peroxisomes. In this pathway, glycolate oxidation takes place in peroxisomes. It was previously suggested that a mitochondrial glycolate dehydrogenase (GlcDH) that was conserved from green algae lacking leaf-type peroxisomes contributes to photorespiration in Arabidopsis thaliana. Here, the identification of two Arabidopsis mitochondrial alanine:glyoxylate aminotransferases (ALAATs) that link glycolate oxidation to glycine formation are described. By this reaction, the mitochondrial side pathway produces glycine from glyoxylate that can be used in the glycine decarboxylase (GCD) reaction of the major pathway. RNA interference (RNAi) suppression of mitochondrial ALAAT did not result in major changes in metabolite pools under standard conditions or enhanced photorespiratroy flux, respectively. However, RNAi lines showed reduced photorespiratory CO(2) release and a lower CO(2) compensation point. Mitochondria isolated from RNAi lines are incapable of converting glycolate to CO(2), whereas simultaneous overexpression of GlcDH and ALAATs in transiently transformed tobacco leaves enhances glycolate conversion. Furthermore, analyses of rice mitochondria suggest that the side pathway for glycolate oxidation and glycine formation is conserved in monocotyledoneous plants. It is concluded that the photorespiratory pathway from green algae has been functionally conserved in higher plants 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 7 |a Glycolates  |2 NLM 
650 7 |a Plant Proteins  |2 NLM 
650 7 |a glycolic acid  |2 NLM 
650 7 |a 0WT12SX38S  |2 NLM 
650 7 |a Carbon Dioxide  |2 NLM 
650 7 |a 142M471B3J  |2 NLM 
650 7 |a Oxidoreductases  |2 NLM 
650 7 |a EC 1.-  |2 NLM 
650 7 |a Alanine Transaminase  |2 NLM 
650 7 |a EC 2.6.1.2  |2 NLM 
650 7 |a Glycine  |2 NLM 
650 7 |a TE7660XO1C  |2 NLM 
700 1 |a Krause, Katrin  |e verfasserin  |4 aut 
700 1 |a Horst, Ina  |e verfasserin  |4 aut 
700 1 |a Staebler, Norma  |e verfasserin  |4 aut 
700 1 |a Klaus, Stephanie  |e verfasserin  |4 aut 
700 1 |a Gaertner, Stefanie  |e verfasserin  |4 aut 
700 1 |a Kebeish, Rashad  |e verfasserin  |4 aut 
700 1 |a Araujo, Wagner L  |e verfasserin  |4 aut 
700 1 |a Fernie, Alisdair R  |e verfasserin  |4 aut 
700 1 |a Peterhansel, Christoph  |e verfasserin  |4 aut 
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773 1 8 |g volume:63  |g year:2012  |g number:7  |g day:01  |g month:04  |g pages:2705-16 
856 4 0 |u http://dx.doi.org/10.1093/jxb/err453  |3 Volltext 
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