DEAD-box helicase domain of ATP-dependent RNA helicases DDX3 and DDX4
This subfamily includes Drosophila melanogaster Vasa, which is essential for development. DEAD box protein 3 (DDX3) has been reported to display a high level of RNA-independent ATPase activity stimulated by both RNA and DNA. DEAD box protein 4 (DDX4, also known as VASA homolog) is an ATP-dependent RNA helicase required during spermatogenesis and is essential for the germline integrity. DDX3 and DDX4 are members 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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