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Nucleic Acids Research, Vol 24, Issue 5 835-842, Copyright © 1996 by Oxford University Press

ARTICLES

Cleavage by RNase P of gene N mRNA reduces bacteriophage lambda burst size

Y Li and S Altman
Department of Biology, Yale University, New Haven, CT 06520, USA.

RNase P, an enzyme essential for tRNA biosynthesis, can be directed to cleave any RNA when the target RNA is in a complex with a short, complementary oligonucleotide called an external guide sequence (EGS). RNase P from Escherichia coli can cleave phage lambda N mRNA in vitro or in vivo when the mRNA is in a complex with an EGS. The EGS can either be separate from or covalently linked to M1 RNA, the catalytic RNA subunit of RNase P. The requirement for Mg2+ in the reaction in vitro is lower when the EGS is covalently linked to M1 RNA. Substrates made of DNA can also be cleaved by RNase P in vitro in complexes with RNA EGSs. When either kind of EGS construct is used in vivo, burst size of phage lambda is reduced by > or = 40%. Reduction in burst size depends on efficient expression of the EGS constructs. The product of phage lambda gene N appears to function in a stoichiometric fashion.
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