Generation of pre-tRNAs from polycistronic operons is the essential function of RNase P in Escherichia coli.
In: Nucleic acids research, Jg. 48 (2020-03-18), Heft 5, S. 2564-2578
academicJournal
Zugriff:
Ribonuclease P (RNase P) is essential for the 5'-end maturation of tRNAs in all kingdoms of life. In Escherichia coli, temperature sensitive mutations in either its protein (rnpA49) and or RNA (rnpB709) subunits lead to inviability at nonpermissive temperatures. Using the rnpA49 temperature sensitive allele, which encodes a partially defective RNase P at the permissive temperature, we show here for the first time that the processing of RNase P-dependent polycistronic tRNA operons to release pre-tRNAs is the essential function of the enzyme, since the majority of 5'-immature tRNAs can be aminoacylated unless their 5'-extensions ≥8 nt. Surprisingly, the failure of 5'-end maturation elicits increased polyadenylation of some pre-tRNAs by poly(A) polymerase I (PAP I), which exacerbates inviability. The absence of PAP I led to improved aminoacylation of 5'-immature tRNAs. Our data suggest a more dynamic role for PAP I in maintaining functional tRNA levels in the cell.
(© The Author(s) 2020. Published by Oxford University Press on behalf of Nucleic Acids Research.)
Titel: |
Generation of pre-tRNAs from polycistronic operons is the essential function of RNase P in Escherichia coli.
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Autor/in / Beteiligte Person: | Mohanty, BK ; Agrawal, A ; Kushner, SR |
Zeitschrift: | Nucleic acids research, Jg. 48 (2020-03-18), Heft 5, S. 2564-2578 |
Veröffentlichung: | 1992- : Oxford : Oxford University Press ; <i>Original Publication</i>: London, Information Retrieval ltd., 2020 |
Medientyp: | academicJournal |
ISSN: | 1362-4962 (electronic) |
DOI: | 10.1093/nar/gkz1188 |
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