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  1. 2 Acta Biochimica Polonica

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  1. 1 2016

  2. 1 2008

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  1. 2 Rurek M.

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Participation of non-coding RNAs in plant organelle biogenesis

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Rurek M.
|
2016
|
vol. 63
|
issue 4
653-663
EN
The biogenesis of plant mitochondria and plastids is a multistep process that depends on the expression of both, organellar and nuclear genes. A growing body of evidence suggests that the indispensable coordination of different steps in this process may be gained by participation of the non-coding RNAs. A plethora of non-coding RNAs of diverse length, both intraorganellar ones, as well as encoded by the nuclear genome (including microRNAs and short interfering RNAs), were also suggested to play a role in the stress response by regulating the expression levels of targeted genes important for organelle biogenesis. Selected points of current interest regarding the regulation of plant mitochondrial and plastid gene expression by diverse non-coding RNAs, also discussed in the aspect of abiotic stress conditions, are highlighted here.
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Proteins involved in maturation pathways of plant mitochondrial and plastid c-type cytochromes

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Rurek M.
|
2008
|
vol. 55
|
issue 3
417-433
EN
c-type cytochromes are characterized by the presence of two covalent bonds linking heme to apocytochrome and by the heme attachment motif in the apoprotein. Several molecular systems for the maturation of c-type cytochromes have evolved in different organisms. The best characterized are three of them: system I, system II and system III. Heme is synthesized in bacterial cytoplasm, in plastids, and in animal and fungal mitochondria. Therefore the maturation of bacterial and plastid c-type cytochromes involves the transport of heme and apocytochrome from the n-side to the p-side of the respective biological membranes and the formation of the covalent bond at the p-side. It should be underlined that the site of the c-type apocytochrome synthesis is also distinct from the site of its functioning. The aim of this review is to present the current state of knowledge concerning the structure and function of two systems - system I and system II - in the maturation of plant mitochondrial and plastid c-type cytochromes, respectively.
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