5′-End maturation of tRNA in Aquifex aeolicus
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Michal Marszalkowski
Abstract
5′-End maturation of tRNA primary transcripts is thought to be ubiquitously catalyzed by ribonuclease P (RNase P), a ribonucleoprotein enzyme in the vast majority of organisms and organelles. In the hyperthermophilic bacterium Aquifex aeolicus, neither a gene for the RNA nor the protein component of bacterial RNase P has been identified in its sequenced genome. Here, we demonstrate the presence of an RNase P-like activity in cell lysates of A. aeolicus. Detection of activity was sensitive to the buffer conditions during cell lysis and partial purification, explaining why we failed to observe activity in the buffer system applied previously. RNase P-like activity of A. aeolicus depends on the presence of Mg2+ or Mn2+, persists at high temperatures, which inactivate RNase P enzymes from mesophilic bacteria, and is remarkably resistant to micrococcal nuclease treatment. While cellular RNA fractions from other Aquificales (A. pyrophilus, Hydrogenobacter thermophilus and Thermocrinis ruber) could be stimulated by bacterial RNase P proteins to catalyze tRNA 5′-end maturation, no such stimulation was observed with RNA from A. aeolicus. In conclusion, our results point to the possibility that RNase P-like activity in A. aeolicus is devoid of an RNA subunit or may include an RNA subunit with untypical features.
©2008 by Walter de Gruyter Berlin New York
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Artikel in diesem Heft
- Highlight: 59th Mosbach Kolloquium
- The role of long non-coding RNAs in chromatin structure and gene regulation: variations on a theme
- The histone H1 family: specific members, specific functions?
- ATP-dependent chromatosome remodeling
- Role of histone modifications in defining chromatin structure and function
- Differential loss of histone H3 isoforms mono-, di- and tri-methylated at lysine 4 during X-inactivation in female embryonic stem cells
- Disentanglement of protease substrate repertoires
- p53-dependent repression of the human MCL-1 gene encoding an anti-apoptotic member of the BCL-2 family: the role of Sp1 and of basic transcription factor binding sites in the MCL-1 promoter
- 5′-End maturation of tRNA in Aquifex aeolicus
- Smurf1 directly targets hPEM-2, a GEF for Cdc42, via a novel combination of protein interaction modules in the ubiquitin-proteasome pathway
- Purification and characterization of natural Ara h 8, the Bet v 1 homologous allergen from peanut, provides a novel isoform
- Human butyrylcholinesterase components differ in aryl acylamidase activity
- Ribosome display and selection of human anti-CD22 scFvs derived from an acute lymphocytic leukemia patient
- Sub-chronic administration of the 11β-HSD1 inhibitor, carbenoxolone, improves glucose tolerance and insulin sensitivity in mice with diet-induced obesity
- Inhibitory effect of the sugarcane cystatin CaneCPI-4 on cathepsins B and L and human breast cancer cell invasion
