Table 1.

Sedimentation coefficients (S_20,w) and tail-mediated internucleosomal (E_TC) and linker/linker electrostatic energies (E_LL) for 12-unit nucleosomal arrays at different salt concentrations (C_s)

Array type	Cs, M	S20,w, S	ETC, kcal/mol	ELL, kcal/mol
Regular	0.01	30.0 ± 0.1	−1.71 ± 0.04	6.61 ± 0.05
	0.2	39.0 ± 1.2	−0.75 ± 0.16	0.72 ± 0.09
H3†	0.01	25.8 ± 0.1	−0.31 ± 0.02	3.50 ± 0.01
	0.2	33.2 ± 0.4	−0.13 ± 0.01	0.13 ± 0.01
H4†	0.01	29.8 ± 0.1	−0.58 ± 0.01	6.55 ± 0.04
	0.2	35.6 ± 0.4	−0.14 ± 0.02	0.62 ± 0.03
H2A†	0.01	29.6 ± 0.1	−1.00 ± 0.02	6.48 ± 0.08
	0.2	35.0 ± 0.3	−0.19 ± 0.03	0.56 ± 0.02
H2B†	0.01	29.6 ± 0.1	−0.89 ± 0.02	6.45 ± 0.06
	0.2	36.1 ± 0.8	−0.24 ± 0.08	0.62 ± 0.02
H2A*†	0.01	30.0 ± 0.1	−1.21 ± 0.02	6.63 ± 0.05
	0.2	38.5 ± 1.0	−0.47 ± 0.06	0.68 ± 0.03
All†	0.01	25.8 ± 0.2	0.0	3.23 ± 0.03
	0.2	31.2 ± 0.2	0.0	0.14 ± 0.01
Compact	0.2	49.7 ± 2.3	−2.50 ± 0.67	0.0

Tabulated energies are given “per core.” Data are presented as ±SD.

^†Array segments that have been neutralized.

H2A*, C termini of H2A histones.