DEAD-box helicase domain of eukaryotic initiation factor 4A-III
Eukaryotic initiation factor 4A-III (EIF4AIII, also known as DDX48) is part of the exon junction complex (EJC) that plays a major role in posttranscriptional regulation of mRNA. EJC consists of four proteins (eIF4AIII, Barentsz [Btz], Mago, and Y14), mRNA, and ATP. DDX48 is a member of the DEAD-box helicases, a diverse family of proteins involved in ATP-dependent RNA unwinding, needed in a variety of cellular processes including splicing, ribosome biogenesis and RNA degradation. The name derives from the sequence of the Walker B motif (motif II). This domain contains the ATP-binding region.
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