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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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Decoding the centromeric nucleosome through CENP-N.

Satyakrishna Pentakota1, Keda Zhou2, Charlotte Smith1

  • 1Department of Mechanistic Cell Biology, Max-Planck Institute of Molecular Physiology, Dortmund, Germany.

Elife
|December 28, 2017
PubMed
Summary

Centromere protein N (CENP-N) precisely binds centromeres by recognizing unique CENP-A features and DNA. This interaction, along with CENP-C, stabilizes the CENP-A nucleosome for accurate chromosome segregation.

Keywords:
CENP-ACENP-CCENP-Nbiophysicscentromerechromosomesgeneshumankinetochoremitosisstructural biology

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Area of Science:

  • Cell Biology
  • Epigenetics
  • Structural Biology

Background:

  • Centromere protein A (CENP-A) is a histone H3 variant essential for centromere identity.
  • Centromeres recruit kinetochores, which are crucial for chromosome segregation during mitosis.
  • CENP-C and CENP-N are kinetochore proteins that interact with CENP-A nucleosomes.

Purpose of the Study:

  • To elucidate the structural mechanisms underlying CENP-N's selective binding to centromeres.
  • To understand how CENP-N recognizes the unique CENP-A nucleosome.
  • To investigate the role of CENP-C in CENP-N recruitment and centromere stability.

Main Methods:

  • X-ray crystallography to determine the structure of CENP-N bound to CENP-A nucleosomes.
  • Biochemical assays to confirm binding interactions.
  • Computational modeling to predict functional implications.

Main Results:

  • CENP-N utilizes charge-space complementarity to recognize the unique L1 loop of CENP-A.
  • CENP-N interacts extensively with a specific DNA segment within the distorted nucleosomal DNA.
  • Stable CENP-N binding requires simultaneous interaction with both CENP-A and a novel motif on CENP-C.

Conclusions:

  • The structural insights clarify how CENP-N achieves centromere specificity.
  • The findings highlight the cooperative roles of CENP-A, CENP-C, and CENP-N in epigenetic centromere specification.
  • This work provides a foundation for understanding kinetochore assembly and chromosome segregation fidelity.