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NMR evidence for a base triple in the HIV-2 TAR C-G.C+ mutant-argininamide complex

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Overview

authors

  • Brodsky, A. S.
  • Erlacher, H. A.
  • Williamson, James

publication date

  • 1998

journal

  • Nucleic Acids Research  Journal

abstract

  • Formation of a specific complex between the HIV Tat protein and the small RNA element TAR is critical for activation of viral transcription. A model complex for this interaction composed of HIV-2 TAR and the amide derivative of arginine has been developed to study how Tat and TAR interact specifically. We have previously determined a high resolution NMR structure of the HIV-2 TAR-argininamide complex. The argininamide guanidium group hydrogen bonds to the major groove face of G26 and is stacked between U23 and A22, forming an arginine sandwich. This structure also provided evidence for formation of a U38-A27.U38 base triple, as U23 is positioned in the major groove within hydrogen bonding distance to A27. However, the expected U23 imino proton was not observed, preventing unambiguous identification of the base triple. Previous work on an isomorphic C38-G27.C23+ base triple mutant of the three base bulge HIV-1 TAR-argininamide complex demonstrated that the base triple is required for specific argininamide binding. Here we investigate the same C38-G27.C23+ base triple mutant in the context of two base bulge HIV-2 TAR. The improved NMR spectral properties of HIV-2 TAR allowed observation of the C23 amino and imino protons for the first time, providing direct evidence that a hydrogen bonding interaction is occurring. The NOEs observed correspond to those observed in the high resolution structure of the HIV-2 TAR-argininamide complex, confirming that a base triple is an important feature of the TAR-argininamide interaction.

subject areas

  • Arginine
  • Bacterial Proteins
  • Base Composition
  • Base Sequence
  • Chemoreceptor Cells
  • Cytosine
  • Escherichia coli Proteins
  • Gene Products, tat
  • Guanine
  • HIV-2
  • Hydrogen Bonding
  • Membrane Proteins
  • Models, Molecular
  • Molecular Sequence Data
  • Nuclear Magnetic Resonance, Biomolecular
  • Nucleic Acid Conformation
  • Point Mutation
  • RNA, Viral
  • Receptors, Cell Surface
  • Transcription, Genetic
  • tat Gene Products, Human Immunodeficiency Virus
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Identity

PubMed Central ID

  • PMC147484

International Standard Serial Number (ISSN)

  • 0305-1048

Digital Object Identifier (DOI)

  • 10.1093/nar/26.8.1991

PubMed ID

  • 9518494
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Additional Document Info

start page

  • 1991

end page

  • 1995

volume

  • 26

issue

  • 8

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