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. 1998 Jun 1;26(11):2565–2572. doi: 10.1093/nar/26.11.2565

RNA heptamers that direct RNA cleavage by mammalian tRNA 3' processing endoribonuclease.

M Nashimoto 1, S Geary 1, M Tamura 1, R Kaspar 1
PMCID: PMC147582  PMID: 9592138

Abstract

Mammalian tRNA 3' processing endoribonuclease (3' tRNase) can recognize and cleave any target RNA that forms a precursor tRNA-like complex with another RNA. Various sets of RNA molecules were tested to identify the smallest RNA that can direct target RNA cleavage by 3' tRNase. A 3' half tRNAArgwas cleaved efficiently by 3' tRNase in the presence of small 5' half tRNAArgvariants, the D stem-loop region of which was partially deleted. Remarkably, 3' tRNase also cleaved the 3' half tRNAArgin the presence of a 7 nt 5' tRNAArg composed only of the acceptor stem region with a catalytic efficiency comparable with that of cleavage directed by an intact 5' half tRNAArg. The catalytic efficiency of cleavage directed by the heptamer decreased as the stability of the T stem-loop structures of 3' half tRNAArg variants decreased. No heptamer-directed cleavage of a 3' half tRNAArg without T stem base pairs was detected. A heptamer also directed cleavage of an HIV-1 RNA containing a stable hairpin structure. These findings suggest that in the presence of an RNA heptamer, 3' tRNase can discriminate and eliminate target RNAs that possess a stable hairpin adjacent to the heptamer binding sequence from a large complex RNA pool.

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Selected References

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