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• W1976804920 endingPage "2058" @default.
• W1976804920 startingPage "2053" @default.
• W1976804920 abstract "A plastid-derived signal plays an important role in the coordinated expression of both nuclear- and chloroplast-localized genes that encode photosynthesis-related proteins. Arabidopsis GUN (genomes uncoupled) loci have been identified as components of plastid-to-nucleus signal transduction. Unlike wild-type plants, gun mutants have nuclear Lhcb1 expression in the absence of chloroplast development. We observed a synergistic phenotype in some gun double-mutant combinations, suggesting there are at least two independent pathways in plastid-to-nucleus signal transduction. There is a reduction of chlorophyll accumulation in gun4 and gun5 mutant plants, and a gun4gun5 double mutant shows an albino phenotype. We cloned the GUN5 gene, which encodes the ChlH subunit of Mg-chelatase. We also show that gun2 and gun3 are alleles of the known photomorphogenic mutants, hy1 and hy2, which are required for phytochromobilin synthesis from heme. These findings suggest that certain perturbations of the tetrapyrrole biosynthetic pathway generate a signal from chloroplasts that causes transcriptional repression of nuclear genes encoding plastid-localized proteins. The comparison of mutant phenotypes of gun5 and another Mg-chelatase subunit (ChlI) mutant suggests a specific function for ChlH protein in the plastid-signaling pathway." @default.
• W1976804920 created "2016-06-24" @default.
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• W1976804920 date "2001-02-13" @default.
• W1976804920 modified "2023-10-06" @default.
• W1976804920 title "<i>Arabidopsis genomes uncoupled 5</i> ( <i>GUN5</i> ) mutant reveals the involvement of Mg-chelatase H subunit in plastid-to-nucleus signal transduction" @default.
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• W1976804920 doi "https://doi.org/10.1073/pnas.98.4.2053" @default.
• W1976804920 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/29380" @default.
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