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TitleThe in situ structures of mono-, di-, and trinucleosomes in human heterochromatin.
Journal, issue, pagesMol Biol Cell, Vol. 29, Issue 20, Page 2450-2457, Year 2018
Publish dateOct 1, 2018
AuthorsShujun Cai / Désirée Böck / Martin Pilhofer / Lu Gan /
PubMed AbstractThe in situ three-dimensional organization of chromatin at the nucleosome and oligonucleosome levels is unknown. Here we use cryo-electron tomography to determine the in situ structures of HeLa ...The in situ three-dimensional organization of chromatin at the nucleosome and oligonucleosome levels is unknown. Here we use cryo-electron tomography to determine the in situ structures of HeLa nucleosomes, which have canonical core structures and asymmetric, flexible linker DNA. Subtomogram remapping suggests that sequential nucleosomes in heterochromatin follow irregular paths at the oligonucleosome level. This basic principle of higher-order repressive chromatin folding is compatible with the conformational variability of the two linker DNAs at the single-nucleosome level.
External linksMol Biol Cell / PubMed:30091658 / PubMed Central
MethodsEM (tomography) / EM (subtomogram averaging)
Resolution21.0 - 24.0 Å
Structure data

EMDB-6948:
Volta phase contrast cryotomogram of a cryo-FIB lamella of an interphase HeLa cell
Method: EM (tomography)

EMDB-6949:
Subtomogram average of a nucleosome with short linker DNA from a Volta phase contrast cryotomogram of a cryo-FIB lamella of an interphase HeLa cell
Method: EM (subtomogram averaging) / Resolution: 24.0 Å

EMDB-6950:
Subtomogram average of a nucleosome with long linker DNA from a Volta phase contrast cryotomogram of a cryo-FIB lamella of an interphase HeLa cell
Method: EM (subtomogram averaging) / Resolution: 21.0 Å

Source
  • Homo sapiens (human)

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