Abstract:
:Retrovirus genomic mRNA exhibits a several hundred nucleotides-long untranslated region (5' UTR) which encloses many control elements required for retrovirus replication. In addition, this 5' UTR contains translation regulatory elements, such as internal ribosome entry sites (IRESes) that have been described in oncoretroviruses, as well as in lentiviruses. UV cross-linking experiments suggested that the pyrimidine tract binding protein (PTB), a cellular protein known to regulate the activity of several picornaviral IRESes, binds to human T-cell leukemia virus (HTLV)-I RNA but not to lentiviral human immunodeficiency virus (HIV)-1, HIV-2 or simian immunodeficiency virus RNAs. To calculate the affinity of such RNA-protein interactions, we developed a new method based on the BIAcore technology. The absence of affinity of PTB for lentiviral RNAs was confirmed, whereas its affinity for HTLV-I RNAs was 1000-fold lower than for picornaviral RNAs. The BIAcore technology also revealed a significant affinity of the La autoantigen, previously described for its involvement in translational control of viral mRNAs, for HIV-1 and HTLV-I RNAs. Addition of recombinant PTB to in vitro translation experiments weakly enhanced translation initiation in the presence of HTLV-I IRES, suggesting that such an IRES requires additional trans-acting factors.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Waysbort A,Bonnal S,Audigier S,Estève JP,Prats ACdoi
10.1016/s0014-5793(01)02137-8keywords:
subject
Has Abstractpub_date
2001-02-09 00:00:00pages
54-8issue
1-2eissn
0014-5793issn
1873-3468pii
S0014-5793(01)02137-8journal_volume
490pub_type
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