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Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

Ion-Exchange Chromatography

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

Electrospray Ionization (ESI) Mass Spectrometry

Electrospray Ionization (ESI) Mass Spectrometry

Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...

Chromatin Packaging

Chromatin Packaging

Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.

Chromatin Packaging

Chromatin Packaging

Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...

Chromatin Immunoprecipitation- ChIP

Chromatin Immunoprecipitation- ChIP

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.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...

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Related Experiment Video

Updated: Jun 7, 2026

The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin

The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin

Published on: April 11, 2014

Chromatin ionic atmosphere analyzed by a mesoscale electrostatic approach.

Hin Hark Gan¹, Tamar Schlick

¹Department of Chemistry, New York University, New York, USA.

Biophysical Journal

|October 21, 2010

Summary

This summary is machine-generated.

Understanding ion distribution around chromatin is key for its structure and function. Our electrostatic model reveals how ions condense, influencing chromatin

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Last Updated: Jun 7, 2026

The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin

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Published on: April 11, 2014

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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C

Published on: October 14, 2022

Area of Science:

Biophysics
Structural Biology
Computational Biology

Background:

Chromatin's electrostatic environment is crucial for its structure and function.
Previous models often simplified ion interactions, limiting detailed analysis.
Understanding ion distribution is key to deciphering forces governing chromatin assembly.

Purpose of the Study:

To develop and apply an electrostatic model for multivalent ions around chromatin.
To compute and visualize ionic distribution as a function of chromatin conformation and ionic conditions.
To investigate counterion condensation and its impact on chromatin structure.

Main Methods:

Developed a mesoscale electrostatic model for chromatin.
Utilized Poisson-Boltzmann theory to compute ionic distributions.
Analyzed ionic densities, free energies, and shielding charges.

Main Results:

Identified predominant counterion condensation on nucleosomal/linker DNA and histone tails.
Demonstrated that ionic screening is highly sensitive to local and global chromatin conformations.
Quantified a wide range of net nucleosome core screening charges (56-100e).
Revealed correlations in shielding charges indicating conformational flexibility and subunit interactions.

Conclusions:

The model provides detailed insights into ionic effects on chromatin structure with modest computational resources.
Counterion condensation significantly influences chromatin's electrostatic landscape.
The electrostatic model is adaptable for studying other coarse-grained macromolecular complexes.