Chromatin remodeling complexes have been implicated in the disruption or re
formation of nucleosomal arrays resulting in modulation of transcription, D
NA replication, and DNA repair. Here we report the isolation of WCRF, a new
chromatin-remodeling complex from HeLa cells. WCRF is composed of two subu
nits, WCRF135, the human homolog of Drosophila ISWI, and WCRF180, a protein
related to the Williams syndrome transcription factor. WCRF180 is a member
of a family of proteins sharing a putative heterochromatin localization do
main, a PHD finger, and a bromodomain, prevalent in factors involved in reg
ulation of chromatin structure.