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IN BRIEF

Interorganellar Communication: Protein Synthesis in Organelles Influences Nuclear Photosynthetic Gene Expression

Arabidopsis prors1-1 and -2 mutants show a decrease in the effective quantum yield of photosystem II. Pesaresi et al. (pages 970–991) show that these mutations are localized to the 5'-untranslated region of the nuclear gene ProRS1, which encodes a prolyl-tRNA synthethase (ProRS1) that acts in both plastids and mitochondria. ProRS1 activity is essential for plant development, as null alleles result in the arrest of embryo development. The prors1-1 and -2 mutants are leaky alleles that retain limited functionality but show reduced ProRS1 expression, with concomitant effects on protein synthesis in both organelles. In these mutants, transcription of nuclear genes for proteins involved in the light reactions of photosynthesis is markedly downregulated, whereas genes for other chloroplast proteins are predominantly upregulated, independently of light and photooxidative stress. Further analysis of other mutants perturbed in mitochondrial and plastid ribosomal proteins suggests that signals derived from both types of organelle cooperate in the regulation of nuclear photosynthetic gene expression.

View larger version (126K): [in this window] [in a new window]   Aborted ovule-like structures are visible in early embryos of the prors1 mutant (right) compared with wild-type (left) siliques.

Related articles in Plant Cell:

Nuclear Photosynthetic Gene Expression Is Synergistically Modulated by Rates of Protein Synthesis in Chloroplasts and Mitochondria

Paolo Pesaresi, Simona Masiero, Holger Eubel, Hans-Peter Braun, Shashi Bhushan, Elzbieta Glaser, Francesco Salamini, and Dario Leister
Plant Cell 2006 18: 970-991. [Abstract] [Full Text]  

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