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Related Experiment Videos

A minimal lentivirus Tat.

D Derse1, M Carvalho, R Carroll

  • 1Laboratory of Viral Carcinogenesis, National Cancer Institute, Frederick, Maryland 21702-1201.

Journal of Virology
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

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Researchers identified minimal functional domains within lentivirus Tat proteins essential for viral transcription. This study reveals that a 25-amino acid Tat contains 15 amino acids for transcription modification and 10 for RNA binding.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Lentiviruses utilize trans-activation responsive (TAR) elements for transcriptional regulation.
  • Viral Tat proteins interact with TAR RNA stem-loops to enhance transcription processivity and viral genome replication.

Purpose of the Study:

  • To delineate the essential activation and RNA-binding domains of lentiviral Tat proteins.
  • To characterize the minimal functional components of Tat required for trans activation.

Main Methods:

  • A novel RNA-tethering system was employed using bacteriophage R17 coat protein and its operator.
  • Peptide motifs from equine infectious anemia virus (EIAV) and human immunodeficiency virus type 1 (HIV-1) Tat were fused to the coat protein.
  • The functional domains were mapped on the EIAV long terminal repeat with a modified TAR element.

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Main Results:

  • The study mapped activation domains of HIV-1 and EIAV Tat to 47 and 15 amino acids, respectively.
  • RNA-binding domains were localized to 10 amino acids for HIV-1 Tat and 26 amino acids for EIAV Tat.
  • A minimal lentivirus Tat was defined as 25 amino acids, comprising 15 for transcription modification and 10 for RNA binding.

Conclusions:

  • The findings provide a precise definition of the minimal functional units within lentiviral Tat proteins.
  • This research clarifies the distinct roles of specific amino acid residues in Tat-mediated transcriptional enhancement and RNA interaction.