Effector domains of human immunodeficiency virus type 1 Rev and human T-cell leukemia virus type I Rex are functionally interchangeable and share an essential peptide motif.
The human immunodeficiency virus type 1 Rev and human T-cell leukemia virus type I Rex transactivators are posttranscriptional regulatory proteins that promote retroviral gene expression by interacting with specific viral mRNAs. Rev and Rex have markedly dissimilar amino acid sequences and RNA target specificities but are thought to act through the same cellular pathway. In this report, we demonstrate that short peptide domains which are required for effector activity in Rev and Rex are functionally interchangeable. Activity of these effector domains depends upon a previously unrecognized tetrapeptide motif that is present in both Rev and Rex and also in analogous proteins from other complex retroviruses. The conserved effector motif may mediate essential interactions of Rev, Rex, and other transactivators of this type with a common cellular cofactor.
Department of Pathology, University of California, San Francisco 94143-0506.
T J
TJ
Hope
B L
BL
Bond
D
D
McDonald
N P
NP
Klein
T G
TG
Parslow
D000595:Amino Acid Sequence; D001483:Base Sequence; D002460:Cell Line; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D015694:Gene Products, rev / Q000032:analysis / Q000235:genetics*; D016370:Gene Products, rex / Q000032:analysis / Q000235:genetics*; D016355:Genes, pX; D015757:Genes, rev; D015497:HIV-1 / Q000235:genetics*; D015368:Human T-lymphotropic virus 1 / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009838:Oligodeoxyribonucleotides; D010957:Plasmids; D016133:Polymerase Chain Reaction; D011993:Recombinant Fusion Proteins / Q000032:analysis; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D014162:Transfection; D054321:rev Gene Products, Human Immunodeficiency Virus
D015694:Gene Products, rev; D016370:Gene Products, rex; D009838:Oligodeoxyribonucleotides; D011993:Recombinant Fusion Proteins; D054321:rev Gene Products, Human Immunodeficiency Virus; D015500:Chloramphenicol O-Acetyltransferase