May play a role in organellar ribosome biogenesis and suppress 16S rRNA maturation. ATP + H2O = ADP + H(+) + phosphate Expressed in flowers and pollen grains. Induced by auxin (NAA), abscisic acid (ABA) and jasmonate (JA). The Q motif is unique to and characteristic of the DEAD box family of RNA helicases and controls ATP binding and hydrolysis. Belongs to the DEAD box helicase family. DDX31/DBP7 subfamily. Truncated C-terminus.