Involved in pre-mRNA splicing. ATP + H2O = ADP + H(+) + phosphate A number of isoforms are produced. Widely expressed. Embryo defective (PubMed:15266054). Reduced stature, early flowering and altered leaf morphology (PubMed:17008405). Belongs to the DEAD box helicase family. DEAH subfamily. PRP2 sub-subfamily.