Proper formation of messenger RNA-protein complexes (mRNPs) is critical for accurate gene expression and requires temporal regulation of mRNA structures. RNA helicases are major players that control mRNP/mRNA structures throughout the life of mRNAs. Our group has shown that the DEAD-box RNA helicase Dbp2 in S. cerevisiae is a bona fide RNA helicase in vitro that is required for proper transcription termination and assembly of RNA-binding proteins onto poly(A)+ RNA in vivo. Here, we utilized multiple genome-wide approaches to identify the mRNAs and processing steps targeted by the enzymatic activity of Dbp2. We found that Dbp2 promotes efficient termination of mRNA transcription through remodeling of RNA structures at the 3’ end of mRNAs. This finding elucidates how an RNA helicase regulates gene expression by modulating RNA structures at a genome-wide scale. In addition, Dbp2 facilitates efficient splicing, for which the helicase activity of Dbp2 is required. This reveals a previously uncharacterized role of RNA helicases besides known splicing factors. Overall, our work shows that Dbp2 plays a critical role in pre-mRNA processing and how RNA structure remodeling impacts gene expression. Overall design: RNA Pol II ChIP-seq libraries for the wild type and dbp2?cells expressing 3XFLAG tagged Rpb3. For each strain, there are input and IP samples. There are 3 biological replicates for the wild type and 3 for dbp2?.