The major protein import receptor of plastids is essential for chloroplast biogenesis
Article Abstract:
Protein import is a limiting process in chloroplast biogenesis. This research indicates that Arabidopsis thaliana Toc159 (atToc159) is vital for the biogenesis of chloroplasts. In, ppi2, an Arabidopsis mutant lacking atToc159, photosynthetic proteins that are usually abundant are transcriptionally repressed. These proteins are found in much smaller volumes in the plastids, although ppi2 dos not influence the expression or the import of less abundant non-photosynthetic plastid proteins. The atToc159 defect restricts the ability of plastids to import a set of highly expressed photosynthetic proteins that are vital for chloroplast biogenesis.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Gateway to the chloroplast
Article Abstract:
New research has considered the in vivo function of the putative import receptor Toc159. It has been possible to identify a mutant Arabidopsis thaliana, known as ppi2, that does not have the Toc159 protein. The proplastics of ppi2 do not develop into chloroplasts and the plants die at the seedling stage. This indicates that Toc159 is vital for chloroplast development. This research has also identified two other import receptor proteins: Toc120 and Toc132. This may give vital information about how plastics recognize a very wide range of transit peptides.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Single gene circles in dinoflagellate chloroplast genomes
Article Abstract:
The DNA genome structure of dinoflagellate chloroplasts is unique. Phylogenetic analysis shows that dinoflagellate chloroplasts are connected with chromistan and red algal chloroplasts. Contig assembly revealed that the sequence of each gene and its adjacent non-coding region is circularly permuted on different clones. The unique organization of dinoflagellate plastid genes gives opportunities for investigating the function and co-evolution of multiple replication origins in a single genome.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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