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Glutathione transferases (GSTs) have been widely studied in Gram-negative bacteria and the structure and function of several representatives have been elucidated. Conversely, limited information is available about the occurrence, classification and functional features of GSTs both in Gram-positive bacteria and in Archaea.An analysis of 305 fully-sequenced Gram-positive genomes highlights the presence...
All functional RNAs are generated from precursor molecules by a plethora of processing steps. The generation of mature RNA molecules by processing is an important layer of gene expression regulation catalysed by ribonucleases. Here, we analysed 5S rRNA processing in the halophilic Archaeon Haloferax volcanii. Earlier experiments showed that the 5S rRNA is cleaved at its 5′ end by the endonuclease...
The archaeal exosome is a protein complex involved in the degradation and the posttranscriptional tailing of RNA. The proteins Rrp41, Rrp42, Rrp4, Csl4 and DnaG are major subunits of the exosome in Sulfolobus solfataricus. In vitro, Rrp41 and Rrp42 form a catalytically active hexamer, to which an RNA-binding cap of Rrp4 and/or Csl4 is attached. Rrp4 confers strong poly(A) specificity to the exosome...
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