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Sequence requirements for Rev multimerization in vivo

S J Madore1, L S Tiley, M H Malim

  • 1Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710.

Virology
|July 1, 1994
PubMed
Summary
This summary is machine-generated.

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Multimerization of human immunodeficiency virus type 1 (HIV-1) Rev protein is essential for its function. This study reveals that specific RNA binding is not required for Rev multimerization in vivo, challenging previous in vitro findings.

Area of Science:

  • Molecular Biology
  • Virology
  • Structural Biology

Background:

  • Multimerization of the human immunodeficiency virus type 1 (HIV-1) Rev protein is crucial for its biological activity.
  • The exact protein sequence requirements for Rev multimerization in vivo and its relationship with RNA binding remain debated.

Purpose of the Study:

  • To develop a sensitive in vivo assay to study HIV-1 Rev multimerization on its cognate RRE RNA.
  • To investigate the role of specific Rev domains and flanking sequences in multimerization in vivo versus in vitro.

Main Methods:

  • Development of a novel in vivo assay to detect HIV-1 Rev multimerization at the RRE RNA binding site.
  • Analysis of Rev mutants with alterations in the arginine-rich domain, flanking sequences, and leucine-rich activation domain.

Related Experiment Videos

Main Results:

  • The arginine-rich domain, essential for RNA binding, is dispensable for Rev multimerization in vivo.
  • Mutations in flanking sequences partially inhibit in vivo multimerization, contrasting with in vitro data.
  • Mutations in the leucine-rich activation domain significantly inhibit in vivo multimerization, despite no observed effect in vitro.

Conclusions:

  • In vivo Rev multimerization on RRE RNA is facilitated by the RNA substrate itself.
  • A cellular cofactor likely bridges multiple Rev activation domains, contributing to the formation of the multimeric Rev:RRE complex in vivo.