Helicase which acts in nucleosome-remodeling by catalyzing ATP-dependent nucleosome mobilization (PubMed:18250149). Likely to be involved in the regulation of transcription (PubMed:18250149). ATP + H2O = ADP + H(+) + phosphate ATPase activity is stimulated by binding to DNA or nucleosomes, but is strongly activated by nucleosomes. Monomer. During embryogenesis, detected in nuclei before and after their migration to the membrane of the preblastoderm embryo (PubMed:18250149). Remains associated with condensed chromosomes in mitotic nuclei. Not detected in nuclei postgastrulation (PubMed:18250149). In polytene chromosomes of third instar larvae, weakly expressed at the chromocenter and fourth chromosome localizing mainly to the interbands (PubMed:18250149). Strongly expressed in early embryos 0 to 3 hours after egg deposition (at protein level) (PubMed:18250149). Expression then decreases and is undetectable in larvae and pupae (at protein level) (PubMed:18250149). Strongly expressed in adult females but expression is absent in adult males (at protein level) (PubMed:18250149). Belongs to the SNF2/RAD54 helicase family. Cloning artifacts. Truncated C-terminus.