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- W4206989002 abstract "Abstract Chloroplast biogenesis requires synthesis of proteins in the nucleocytoplasm and the chloroplast itself. Nucleus-encoded chloroplast proteins are imported via multiprotein translocons in the organelle’s envelope membranes. Controversy exists around whether a 1 MDa complex comprising TIC20, TIC100 and other proteins constitutes the inner membrane TIC translocon. The Arabidopsis cue8 virescent mutant is broadly defective in plastid development. We identify CUE8 as TIC100 . The tic100 cue8 mutant accumulates reduced levels of 1 MDa complex components and exhibits reduced import of two nucleus-encoded chloroplast proteins of different import profiles. A search for suppressors of tic100 cue8 identified a second mutation within the same gene, tic100 soh1 , which rescues the visible, 1 MDa complex-subunit abundance, and chloroplast protein import phenotypes. tic100 soh1 retains but rapidly exits virescence, and rescues the synthetic lethality of tic100 cue8 when retrograde signalling is impaired by the gun1 mutation. Alongside the strong virescence, changes in RNA editing and the presence of unimported precursor proteins show that a strong signalling response is triggered when TIC100 function is altered. Our results are consistent with a role for TIC100, and by extension the 1 MDa complex, in the chloroplast import of photosynthetic and non-photosynthetic proteins, a process which initiates retrograde signalling. One sentence summary Complementary mutations in TIC100 of the chloroplast inner envelope membrane cause reductions or corrective improvements in chloroplast protein import, and highlight a signalling role." @default.
- W4206989002 created "2022-01-26" @default.
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- W4206989002 date "2022-01-22" @default.
- W4206989002 modified "2023-09-26" @default.
- W4206989002 title "Mutations in TIC100 impair and repair chloroplast protein import and impact retrograde signalling" @default.
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- W4206989002 doi "https://doi.org/10.1101/2022.01.18.476798" @default.
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