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| Entry URI | http://metadb.riken.jp/db/SciNetS_ria224i/cria224u4ria224u16507087i |
| Entry name | Lamkemeyer Petra et al. 2006 Mar. Plant J. 45(6):968-81. |
| Title | Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis. |
| Authors | Collin Valérie|Dietz Karl-Josef|Finkemeier Iris|Holtkamp Volker|Issakidis-Bourguet Emmanuelle|Kandlbinder Andrea|Lamkemeyer Petra|Laxa Miriam|Li Wenxue|Miginiac-Maslow Myroslawa|Schöttler Mark A|Tognetti Vanesa B|Weis Engelbert |
| Abstract | Peroxiredoxin Q (Prx Q) is one out of 10 peroxiredoxins encoded in the genome of Arabidopsis thaliana, and one out of four that are targeted to plastids. Peroxiredoxin Q functions as a monomeric protein and represents about 0.3% of chloroplast proteins. It attaches to the thylakoid membrane and is detected in preparations enriched in photosystem II complexes. Peroxiredoxin Q decomposes peroxides using thioredoxin as an electron donor with a substrate preference of H(2)O(2) > cumene hydroperoxide >> butyl hydroperoxide >> linoleoyl hydroperoxide and insignificant affinity towards complex phospholipid hydroperoxide. Plants with decreased levels of Prx Q did not have an apparently different phenotype from wildtype at the plant level. However, similar to antisense 2-cysteine (2-Cys) Prx plants [Baier, M. et al. (2000)Plant Physiol., 124, 823-832], Prx Q-deficient plants had a decreased sensitivity to oxidants in a leaf slice test as indicated by chlorophyll a fluorescence measurements. Increased fluorescence ratios of photosystem II to I at 77 K and modified transcript levels of plastid- and nuclear-encoded proteins show that regulatory mechanisms are at work to compensate for the lack of Prx Q. Apparently Prx Q attaches to photosystem II and has a specific function distinct from 2-Cys peroxiredoxin in protecting photosynthesis. Its absence causes metabolic changes that are sensed and trigger appropriate compensatory responses. |
| Pubmed ID | 16507087 |
| Journal | The Plant journal |
| Volume | 45 |
| Issue | 6 |
| Pages | 968-81 |
| Publication date | 2006 Mar |
| Num of phenotype gene | 0 |