system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, RESULTS. Meshes: Active Transport, Cell Nucleus, Animals, COS Cells, Cell Line, Cell Nucleus, Cercopithecus aethiops, Cytoplasm, Dimerization, Gene Products, rev, Humans, Mutation, Plasmids, RNA, Messenger, RNA, Viral, Transfection.
user
Is hIV-1 Rev oligomerization obligatory in the presence of an extra basic domain? Context: The HIV-1 Rev regulatory protein binds as an oligomeric complex to viral RNA mediating nuclear export of incompletely spliced and non-spliced viral mRNAs encoding the viral structural proteins. However, the biological significance of the obligatory complex formation of Rev upon the viral RNA is unclear. The activity of various fusion proteins based on the negative oligomerization-defect Rev mutant M4 was tested using Rev dependent reporter constructs. An artificial M4 mutant dimer and an M4 mutant containing an extra basic domain from the HTLV-I Rex protein exhibited nearly full activity when compared to wild type Rev.
assistant
Rev dimerization appears to be required to expose free basic domains whilst the Rev oligomeric complex remains bound to viral RNA via other basic domains. Final Decision: no