Abstract
Organellar and secretory RNases, associated with different cellular compartments, are essential to maintain cellular homeostasis during development and in stress responses.
Highlights
During the last 20 years there has been an intense focus on posttranscriptional regulation of gene expression, and the role played by ribonucleases (RNases) in this process
In addition to the “usual suspects” that participate in cytoplasmic and nuclear RNA metabolism, it is clear that organellar and secretory RNases have an important role in this homeostatic regulation
RNases located in plastids and mitochondria maintain a functional transcriptome, affecting mRNA accumulation and adequate synthesis of ribosomal RNA (rRNA) and other noncoding RNA species essential for their function
Summary
Organellar and Secretory Ribonucleases: Major Players in Plant RNA Homeostasis1[OPEN]. Most research has centered on cytoplasmic and nuclear RNA decay enzymes, those involved in mRNA regulation, and in proteins mediating nucleus-localized coding and noncoding RNA processing. These efforts have created a well-defined picture of RNA homeostasis in eukaryotes, including plants (Schmid and Jensen 2018; Sieburth and Vincent 2018; Towler and Newbury, 2018; Matsui et al, 2019). Plants express members of the RNase T2 protein family, associated with the secretory pathway, which are involved in the maintenance of normal cellular homeostasis, with diverse roles, from stress responses to control of self-pollen rejection.
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