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. 1999 Sep;5(9):1235–1247. doi: 10.1017/s1355838299990672

UV cross-link mapping of the substrate-binding site of an RNase P ribozyme to a target mRNA sequence.

A F Kilani 1, F Liu 1
PMCID: PMC1369846  PMID: 10496224

Abstract

RNase P ribozyme cleaves an RNA helix that resembles the acceptor stem and T-stem structure of its natural ptRNA substrate. When covalently linked with a guide sequence, the ribozyme can function as a sequence-specific endonuclease and cleave any target RNA sequences that base pair with the guide sequence. Using a site-directed ultraviolet (UV) cross-linking approach, we have mapped the regions of the ribozyme that are in close proximity to a substrate that contains the mRNA sequence encoding thymidine kinase of human herpes simplex virus 1. Our data suggest that the cleavage site of the mRNA substrate is positioned at the same regions of the ribozyme that bind to the cleavage site of a ptRNA. The mRNA-binding domains include regions that interact with the acceptor stem and T-stem and in addition, regions that are unique and not in close contact with a ptRNA. Identification of the mRNA-binding site provides a foundation to study how RNase P ribozymes achieve their sequence specificity and facilitates the development of gene-targeting ribozymes.

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Selected References

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