Component of NURF (nucleosome remodeling factor), a complex which catalyzes ATP-dependent nucleosome sliding and facilitates transcription of chromatin (PubMed:9784495). NURF is required for homeotic gene expression, proper larval blood cell development, normal male X chromosome morphology, ecdysteroid signaling and metamorphosis (PubMed:9784495, PubMed:8521501). Inorganic pyrophosphatase (PPase), hydrolyzes inorganic pyrophosphate to inorganic phosphate, essential for driving critical biosynthetic reactions including transcription, replication, and DNA repair (PubMed:9784495). diphosphate + H2O = H(+) + 2 phosphate Component of the NURF complex composed of Caf1-55, E(bx), Nurf-38 and Iswi. The ATPase activity of NURF is stimulated by the presence of nucleosomes rather than by free DNA. Belongs to the PPase family.