Fig. 6. Characterization of recombinant histone octamers. SDS/PAGE (15% gel) and Coomassie blue staining of histone octamers assembled from bacterially expressed wild-type (WT) Drosophila histones or histones lacking N-terminal tails, as indicated. G, globular domain. Fig. 7. Nucleosome sliding is not affected by acetylation of histones by p300. (A) hsp70 nucleosomes (359 bp) assembled from nonacetylated recombinant histones (nAC) and nucleosomes containing histones hyperacetylated by p300 (AC) were analyzed by native two-dimensional (2D) gel electrophoresis. (B) Extent of histone acetylation. Histones acetylated by p300 were analyzed by denaturing 2D gel electrophoresis (first-dimension SDS; second-dimension Acetic acid--urea--cetyltrimethylammonium bromide) and Coomassie blue staining. The electrophoretic positions of nonacetylated and multiply acetylated core histones are indicated (1). Reference: 1. Rogakou, E. P., Redon, C., Boon, C., Johnson, K. & Bonner, W. M. (2000) BioTechniques 28, 38-40, 42, 46. Fig. 8. Requirement of histone H4 16-KRHR-19 for the stimulation of the ATPase activity of NURF. Mononucleosomes reconstituted from wild-type or mutant histones were assayed for the ability to stimulate NURF ATPase activity. Hydrolysis of [a-32P]ATP to [a-32P]ADP is measured by TLC. Conditions of assay are as in Fig. 4.