Processed Small RNAs in Archaea and BHB Elements
Processed Small RNAs in Archaea and BHB Elements
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古细菌和 BHB 元素中经过加工的小 RNA
DOI:
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
P. Stadler
中科院分区:
文献类型:
--
作者:
Sarah J. Berkemer;C. H. Z. Siederdissen;F. Amman;Axel Wintsche;S. Will;I. Hofacker;Sonja J. Prohaska;P. Stadler
Bulge-helix-bulge (BHB) elements guide the enzymatic splicing machinery that in Archaea excises introns from tRNAs, rRNAs from their primary precursor, and accounts for the assembly of piece-wise encoded tRNAs. This processing pathway renders the intronic sequences as circularized RNA species. Although archaeal transcriptomes harbor a large number of circular small RNAs, it remains unknown whether most or all of them are produced through BHB-dependent splicing. We therefore conduct a genome-wide survey of BHB elements of a phylogenetically diverse set of archaeal species and complement this approach by searching for BHB-like structures in the vicinity of circularized transcripts. We find that besides tRNA introns, the majority of box C/D snoRNAs is associated with BHB elements. Not all circularized sRNAs, however, can be explained by BHB elements, suggesting that there is at least one other mechanism of RNA circularization at work in Archaea. Pattern search methods were unable, however, to identify common sequence and/or secondary structure features that could be characteristic for such a mechanism.
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