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Mol. Cell. Biol., 05 1996, 2325-2331, Vol 16, No. 5
Copyright © 1996, American Society for Microbiology

Interactions among SR proteins, an exonic splicing enhancer, and a lentivirus Rev protein regulate alternative splicing

RR Gontarek and D Derse
Laboratory of Leukocyte Biology, National Cancer Institute-Frederick Cancer Research and Development Center, Maryland 21702, USA.

We examine here the roles of cellular splicing factors and virus regulatory proteins in coordinately regulating alternative splicing of the tat/rev mRNA of equine infectious anemia virus (EIAV). This bicistronic mRNA contains four exons; exons 1 and 2 encode Tat, and exons 3 and 4 encode Rev. In the absence of Rev expression, the four- exon mRNA is synthesized exclusively, but when Rev is expressed, exon 3 is skipped to produce an mRNA that contains only exons 1, 2, and 4. We identify a purine-rich exonic splicing enhancer (ESE) in exon 3 that promotes exon inclusion. Similar to other cellular ESEs that have been identified by other laboratories, the EIAV ESE interacted specifically with SR proteins, a group of serine/arginine-rich splicing factors that function in constitutive and alternative mRNA splicing. Substitution of purines with pyrimidines in the ESE resulted in a switch from exon inclusion to exon skipping in vivo and abolished binding of SR proteins in vitro. Exon skipping was also induced by expression of EIAV Rev. We show that Rev binds to exon 3 RNA in vitro, and while the precise determinants have not been mapped, Rev function in vivo and RNA binding in vitro indicate that the RNA element necessary for Rev responsiveness overlaps or is adjacent to the ESE. We suggest that EIAV Rev promotes exon skipping by interfering with SR protein interactions with RNA or with other splicing factors.


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