Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis

Lamkemeyer P, Laxa M, Collin V, Li W, Finkemeier I, Schottler MA, Holtkamp V, Tognetti VB, Issakidis-Bourguet E, Kandlbinder A, Weis E, et al. (2006)
PLANT JOURNAL 45(6): 968-981.

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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 H2O2 > 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.
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Lamkemeyer P, Laxa M, Collin V, et al. Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis. PLANT JOURNAL. 2006;45(6):968-981.
Lamkemeyer, P., Laxa, M., Collin, V., Li, W., Finkemeier, I., Schottler, M. A., Holtkamp, V., et al. (2006). Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis. PLANT JOURNAL, 45(6), 968-981.
Lamkemeyer, P., Laxa, M., Collin, V., Li, W., Finkemeier, I., Schottler, M. A., Holtkamp, V., Tognetti, V. B., Issakidis-Bourguet, E., Kandlbinder, A., et al. (2006). Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis. PLANT JOURNAL 45, 968-981.
Lamkemeyer, P., et al., 2006. Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis. PLANT JOURNAL, 45(6), p 968-981.
P. Lamkemeyer, et al., “Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis”, PLANT JOURNAL, vol. 45, 2006, pp. 968-981.
Lamkemeyer, P., Laxa, M., Collin, V., Li, W., Finkemeier, I., Schottler, M.A., Holtkamp, V., Tognetti, V.B., Issakidis-Bourguet, E., Kandlbinder, A., Weis, E., Miginiac-Maslow, M., Dietz, K.-J.: Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis. PLANT JOURNAL. 45, 968-981 (2006).
Lamkemeyer, P, Laxa, M, Collin, V, Li, W, Finkemeier, I, Schottler, MA, Holtkamp, V, Tognetti, VB, Issakidis-Bourguet, E, Kandlbinder, Andrea, Weis, E, Miginiac-Maslow, M, and Dietz, Karl-Josef. “Peroxiredoxin Q of Arabidopsis thaliana is attached to the thylakoids and functions in context of photosynthesis”. PLANT JOURNAL 45.6 (2006): 968-981.
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PMID: 16507087
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