Figure 8From: The conformational flexibility of the C-terminus of histone H4 promotes histone octamer and nucleosome stability and yeast viabilityEffects of H4 tail mutations on histone octamer and nucleosome formation. Size exclusion chromatography (SEC) profile of histone octamer species shows that H4G94P and H4∆94 fail to form octamers. The wild-type (WT) elution positions of each species of WT H3/H4 octamer, H3/H4 tetramer, and H2A/H2B dimers are shown as thin lines. The samples containing H4G94P (dark line) and H4∆94 (dotted line), prepared identically to the WT octamer, elute at the tetramer and dimer elution volumes. (B) H4G94P and H4∆94 form nucleosome core particles (NCPs). WT NCPs were made with 146 bp 601 DNA and histones using salt dialysis (SD NCP), direct addition microscale reconstitution (DNA + oct), and microscale reconstitution (DNA + H3/H4 + H2A/H2B) procedures. H4G94P and H4∆94 containing NCPs were formed using the microscale reconstitution (DNA + H3/H4 + H2A/H2B) procedure. Arrows indicate the positions of the WT and aberrant NCPs [37]. Lower panels are western blots made from the same gel with the indicated antibodies. (C) Electrophoretic analysis of NCP stability. NCPs formed by the microscale reconstitution (DNA + H3/H4 + H2A/H2B) procedure with WT histones, H4G94P, or H4∆94, were incubated with 200, 400, or 600 mM NaCl in the buffers for 1 h prior to electrophoresis. Arrows indicate the positions of the NCPs, H2A/H2B-DNA complexes, H3/H4-DNA complexes (tetrasomes), and free DNA.Back to article page