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Molecular Chaperones and Protein Folding03:00

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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Related Experiment Video

Updated: Jan 5, 2026

In Vitro Characterization of Histone Chaperones using Analytical, Pull-Down and Chaperoning Assays
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Structural Insights into ceNAP1 Chaperoning Activity toward ceH2A-H2B.

Yongrui Liu1, Li Xu1, Changlin Xie1

  • 1Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.

Structure (London, England : 1993)
|October 27, 2019
PubMed
Summary

The histone chaperone NAP1 (nucleosome assembly protein 1) binds histones through an acidic surface. This structural insight explains how NAP1 facilitates nucleosome assembly and maintains genome integrity in eukaryotes.

Keywords:
H2A-H2BH2A.Z-H2BH3-H4NAP1acidic striphistone chaperonenucleosome assembly

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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Nucleosome assembly is vital for genome integrity in eukaryotes.
  • The histone chaperone NAP1 (nucleosome assembly protein 1) is involved in histone dynamics and nucleosome formation.
  • The precise molecular mechanisms of NAP1's function remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular basis of histone chaperone NAP1 activity.
  • To determine the high-resolution crystal structures of Caenorhabditis elegans NAP1 (ceNAP1) bound to histone dimers.
  • To investigate the structural interactions governing histone binding and nucleosome assembly.

Main Methods:

  • High-resolution crystallography
  • Biochemical assays
  • Structural analysis of protein-histone complexes

Main Results:

  • Crystal structures of ceNAP1 complexed with ceH2A-H2B and ceH2A.Z-H2B dimers were determined.
  • An acidic concave surface on ceNAP1 is crucial for histone binding and tetramerization.
  • ceNAP1 homodimers asymmetrically recognize H2A-H2B or H2A.Z-H2B heterodimers via an "acidic strip" on their concave surface.
  • This acidic strip facilitates binding to various histones, including H2A-H2B, H3-H4, and histone variants.

Conclusions:

  • The study reveals the structural basis for NAP1's histone chaperone activity.
  • NAP1 utilizes a conserved acidic surface to bind diverse histone substrates.
  • These findings provide critical insights into the mechanisms of nucleosome assembly and genome maintenance.