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. 2017 Mar 6;216(3):607–621. doi: 10.1083/jcb.201608083

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© 2017 Nechemia-Arbely et al.

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Figure 5. — CENP-A chromatin has the physical characteristics of nucleosomes. (A) Experimental design for the separation of in vitro–reconstituted octameric nucleosomes or tetrasomes over a 5–25% sucrose gradient. (B) After sedimentation of in vitro–reconstituted H3 or CENP-A octameric nucleosomes or (CENP-A/H4)₂ or (H3/H4)₂ tetrasomes, fractions were immunoblotted for CENP-A or H3. (C) Experimental design for the sedimentation of in vivo bulk nucleosomes and short polynucleosomes at different points of the cell cycle. (D) Moderate MNase digestion profile of bulk chromatin from random cycling (RC) cells expressing CENP-A^TAP or H3.1^TAP. (E) Sucrose gradient sedimentation and fractionation of bulk nucleosomes from CENP-A^TAP–expressing cells synchronized at G1, G2, and mitosis. (top) Ethidium bromide stained DNA agarose gel revealing the DNA length extracted from the different fractions. (bottom) Immunoblot for CENP-A^TAP. (F) Real-time quantitative PCR for α-satellite DNA in the different fractions (colored). Second axis shows quantification of CENP-A immunoblot shown in E. No CENP-A or α-satellite DNA was detected in fractions 7 and 9.