Structure of an H1-Bound 6-Nucleosome Array Reveals an Untwisted Two-Start Chromatin Fiber Conformation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11110%2F18%3A10385627" target="_blank" >RIV/00216208:11110/18:10385627 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.molcel.2018.09.027" target="_blank" >https://doi.org/10.1016/j.molcel.2018.09.027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.molcel.2018.09.027" target="_blank" >10.1016/j.molcel.2018.09.027</a>

Result language

angličtina

Original language name

Structure of an H1-Bound 6-Nucleosome Array Reveals an Untwisted Two-Start Chromatin Fiber Conformation

Original language description

Chromatin adopts a diversity of regular and irregular fiber structures in vitro and in vivo. However, how an array of nucleosomes folds into and switches between different fiber conformations is poorly understood. We report the 9.7 angstrom resolution crystal structure of a 6-nucleosome array bound to linker histone H1 determined under ionic conditions that favor incomplete chromatin condensation. The structure reveals a flat two-start helix with uniform nucleosomal stacking interfaces and a nucleosome packing density that is only half that of a twisted 30-nm fiber. Hydroxyl radical footprinting indicates that H1 binds the array in an on-dyad configuration resembling that observed for mononucleosomes. Biophysical, cryo-EM, and crosslinking data validate the crystal structure and reveal that a minor change in ionic environment shifts the conformational landscape to a more compact, twisted form. These findings provide insights into the structural plasticity of chromatin and suggest a possible assembly pathway for a 30-nm fiber.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10600 - Biological sciences

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Molecular Cell

ISSN

1097-2765

e-ISSN

—

Volume of the periodical

72

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

21

Pages from-to

902-"915e7"

UT code for WoS article

000452547600011

EID of the result in the Scopus database

2-s2.0-85055122009