Monday, April 18, 2011

Microbes do some strange things: splitting and permuting tRNAs

Figure 1 - Predicted secondary structures of trans-spliced and permuted precursor tRNAs
(a) Mature tRNAAsp(GUC) in A. pernix and T. aggregans are formed by joining the 5half and the 3half at position 37/38 after splicing at the bulge-helix-bulge (BHB) motif. (b) The 5half and the 3half of trans-spliced tRNALys(CUU) in S. hellenicus and S. marinus join at position 30/31, same as the previously identified split tRNALys(CUU) in N. equitans [5]. (c) Circularized permuted tRNAiMet(CAU) and tRNATyr(GUA) in T. pendens have the 3half located upstream of the 5half separated by intervening sequences represented in green. The two fragments join at position 59/60, same as the T-Ψ-C loop permuted tRNAs in the red alga C. merolae [9]. Pre-tRNAAla(UGC) in C. merolae is shown for comparison. 5half of tRNA transcripts are represented in blue, the 3halves in orange. Black arrows indicate positions of splicing. Anticodons are boxed in light blue.
I was woefully unaware of some of the tRNA shenanigans going on in microbes until reading this paper: Genome Biology | Abstract | Discovery of permuted and recently split transfer RNAs in Archaea from Patricia Chan, Aaron Cozen and Todd Lowe. Life is pretty weird and wacky sometimes, even in components of cells that are considered "core" parts of the machinery of life. Go figure. It is worth a read ...

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