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Nucleic Acids Research, Vol 24, Issue 10 1908-1912, Copyright © 1996 by Oxford University Press

ARTICLES

Fusion with an RNA binding domain to confer target RNA specificity to an RNase: design and engineering of Tat-RNase H that specifically recognizes and cleaves HIV-1 RNA in vitro

YF Melekhovets and S Joshi
Department of Microbiology, Faculty of Medicine, University of Toronto, Ontario, Canada.

A target RNA/DNA-specific nuclease could be constructed if a specific RNA/DNA binding domain allowing target RNA/DNA recognition was fused to a (deoxy)ribonucleolytic domain allowing target RNA/ DNA cleavage. The design and construction of such a chimeric enzyme could be of value for both basic research involving structure-function relationships and applied research requiring inactivation of harmful RNA/DNA molecules of cellular or pathogenic origin. The feasibility of this designer nuclease approach for inactivating specific RNA/DNA molecules was assessed using human immunodeficiency virus type-1 (HIV-1) RNA as a model. Trans-activator of transcription (Tat) protein is one of the key regulatory proteins encoded by HIV-1. It binds to the trans-activation- responsive (TAR) RNA element located within the 5' non-coding region of HIV-1 RNAs. The TAR RNA binding domain of this protein was fused to the ribonuclease (RNase) H domain of HIV-1 reverse transcriptase (RT). RNase H by itself lacks an RNA binding domain. The chimeric Tat-RNase H protein was shown to specifically recognize and cleave HIV-1 TAR RNA in vitro. Cleavage was abolished by mutations in the Tat binding region within the TAR RNA, indicating that it is specific to HIV-1 TAR RNA.
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C. Dow-Tien, T. Yuan-Jhih, and L. Alan
Creating a ribonuclease T-tat that preferentially recognizes and hydrolyzes HIV-1 TAR RNA in vitro and in vivo
Nucleic Acids Res., February 11, 2008; 36(3): 963 - 969.
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