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PMID: 7682716 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Role of RNA structure in arginine recognition of TAR RNA.

Puglisi JD, Chen L, Frankel AD, Williamson JR

Abstract

The human immunodeficiency virus Tat protein binds specifically to an RNA stem-loop structure (TAR) that contains two helical stem regions separated by a three-nucleotide bulge. A single arginine within the basic region of Tat mediates specific binding to TAR, and arginine as the free amino acid also binds specifically to TAR. We have previously proposed a model in which interaction of the arginine guanidinium group with guanosine-26 (G26) and with a pair of phosphates is stabilized by formation of a base triple between U23 in the bulge and A27.U38 in the upper helix. Here we show by NMR spectroscopy that formation of the base triple is critical for arginine binding to TAR. Mutants of TAR that cannot form the base triple or that remove the guanine contact do not bind arginine specifically. These mutants also showed reduced transactivation by Tat. A triple mutant designed to form an isomorphous base triple between C23 and G27.C38 binds arginine and adopts the same conformation as wild-type TAR. These results demonstrate the importance of RNA structure for arginine binding and further demonstrate the direct correspondence between arginine and Tat binding.

MeSH Terms
Arginine Base Sequence Binding Sites Chloramphenicol O-Acetyltransferase/genetics,metabolism Gene Products, tat/metabolism HIV/genetics,metabolism HIV Long Terminal Repeat HeLa Cells Humans Magnetic Resonance Spectroscopy/methods Models, Structural Molecular Sequence Data Mutagenesis Nucleic Acid Conformation RNA/chemistry,metabolism RNA-Binding Proteins/metabolism Transcriptional Activation Transfection tat Gene Products, Human Immunodeficiency Virus
Chemicals
Gene Products, tat RNA-Binding Proteins tat Gene Products, Human Immunodeficiency Virus trans-activation responsive RNA-binding protein RNA Arginine Chloramphenicol O-Acetyltransferase
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Puglisi J D
Department of Chemistry, Massachusetts Institute of Technology, Cambridge 02139.
Chen L
Frankel A D
Williamson J R
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37 references, click to expand
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1993-04-15
Pages
3680-4
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC46365
Subset
IM
Grants
NIAID NIH HHS · AI08591 · United States
NIAID NIH HHS · AI29135 · United States
NIGMS NIH HHS · GM46314 · United States
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