Histone-binding component of NURF (nucleosome remodeling factor), a complex which catalyzes ATP-dependent nucleosome sliding and facilitates transcription of chromatin. Specifically recognizes H3 tails trimethylated on 'Lys-4' (H3K4me3), which mark transcription start sites of virtually all active genes. Required for homeotic gene expression, proper larval blood cell development, normal male X chromosome morphology, ecdysteroid signaling and metamorphosis. Component of the NURF complex composed of Caf1-55, E(bx), Nurf-38 and Iswi. Interacts with Trl. Interacts with histone H3-K4Me3. The second PHD-type zinc finger mediates binding to histone H3K4Me3. Highly susceptible to proteolysis. Belongs to the BPTF family. Contaminating sequence. Potential poly-A sequence. Contaminating sequence. Potential poly-A sequence.