DDX19 is an RNA helicase involved in both mRNA (mRNA) export from the nucleus into the cytoplasm and in mRNA translation. DDX19 functions in the nucleus in resolving RNA:DNA hybrids (R-loops). Activation of a DNA damage response pathway dependent upon the ATR kinase, a major regulator of replication fork progression, stimulates translocation of DDX19 from the cytoplasm into the nucleus. Only nuclear Ddx19 is competent to resolve R-loops. DDX19 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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