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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
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Intrinsically Disordered Proteins02:18

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Spreading of Chromatin Modifications02:25

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Chromatin Packaging02:21

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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? 
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Updated: Jan 26, 2026

A Method to Study de novo Formation of Chromatin Domains
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Disordered domains in chromatin-binding proteins.

Matthew Watson1, Katherine Stott2

  • 1Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, U.K.

Essays in Biochemistry
|April 4, 2019
PubMed
Summary
This summary is machine-generated.

Chromatin packaging is traditionally viewed hierarchically, but new research highlights the crucial role of intrinsically disordered proteins (IDPs) and regions (IDRs) in dynamic, liquid-like genome organization.

Keywords:
chromatinintrinsically disordered proteinslinker histonephase separationpost translational modificationtranscription factor

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • Chromatin, composed of proteins, DNA, and RNA, packages the genome for essential cellular processes like transcription, replication, and repair.
  • Traditional models depict chromatin organization hierarchically, from nucleosomes to the 30-nm fiber and larger domains.
  • Emerging evidence suggests a more dynamic and heterogeneous chromatin structure.

Purpose of the Study:

  • To explore the role of intrinsically disordered proteins (IDPs) and intrinsically disordered regions (IDRs) in chromatin organization.
  • To investigate how disorder contributes to the dynamic and liquid-like properties of chromatin.
  • To understand the involvement of IDPs and IDRs in large-scale genome condensation via liquid-liquid phase separation.

Main Methods:

  • Review of existing literature on chromatin structure and function.
  • Analysis of studies investigating the role of intrinsically disordered proteins and regions.
  • Examination of research on liquid-liquid phase separation in genome organization.

Main Results:

  • Intrinsically disordered proteins (IDPs) and intrinsically disordered regions (IDRs) are integral to chromatin organization at all levels.
  • Disorder is present in histone tails, influencing post-translational modifications and genomic information.
  • IDPs and IDRs drive the condensation of large genomic regions through liquid-liquid phase separation, forming transcription hubs.

Conclusions:

  • Chromatin organization is more dynamic and heterogeneous than previously thought, with IDPs and IDRs playing a central role.
  • The liquid-like nature of chromatin, mediated by disorder, is crucial for regulating genomic transactions.
  • Understanding the function of IDPs and IDRs in chromatin condensation offers new insights into genome regulation.