Abstract
The multifunctional DNA-binding protein (DBP) encoded by human adenovirus binds RNA. The association of purified DBP with RNA in vitro was demonstrated by using either a gel filtration or a filter binding assay. This association is sensitive to ionic strength and exhibits no apparent sequence specificity. DBP also interacts with RNA in vivo; it can be crosslinked to polyadenylylated RNA by UV-irradiation of intact cells during the late phase of adenovirus infections. The 46-kDa carboxyl-terminal domain of DBP binds RNA in vitro and was found to be associated with polyadenylylated RNA in vivo. This is the same domain that interacts with DNA. However, the differences in sensitivity of DBP to trypsin when bound to RNA versus DNA suggest that RNA and DNA either bind at different sites within this domain or induce different conformational changes within the protein.
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