Related Experiment Video
Updated: Jun 23, 2025
11:17
Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
Published on: March 10, 2021
6.4K
Conformational diversity of human HP1α
Tina Ukmar-Godec1, Taekyung Yu1, Alain Ibanez de Opakua1
1German Center for Neurodegenerative Diseases (DZNE), Translational Structural Biology, Göttingen, Germany.
Protein Science : a Publication of the Protein Society
|June 19, 2024
Summary
Heterochromatin protein 1 alpha (HP1α) forms a compact structure through direct contacts between its chromo and chromoshadow domains. Other HP1 isoforms exhibit greater flexibility, potentially explaining their varied gene regulation roles.
Area of Science:
- Molecular Biology
- Structural Biology
- Epigenetics
Background:
- Heterochromatin protein 1 alpha (HP1α) is a key chromatin-binding protein involved in gene silencing.
- HP1α consists of disordered regions and two structured domains: chromo and chromoshadow.
- The full-length structure and dynamics of HP1α are not well understood.
Purpose of the Study:
- To elucidate the structural properties and interdomain dynamics of full-length HP1α.
- To compare the structural behavior of HP1α with its isoforms, HP1β and HP1γ.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy.
- Structure prediction using AlphaFold2.
Main Results:
- HP1α exhibits a compact structure due to direct contacts between its chromo and chromoshadow domains.
- HP1β and HP1γ display increased interdomain dynamics compared to HP1α.
- These findings suggest distinct functional roles for HP1 isoforms in gene regulation.
Conclusions:
- The compact structure of HP1α is mediated by interdomain interactions.
- Differential dynamics among HP1 isoforms may underlie their specific functions in gene silencing and activation.
- This study provides novel insights into the structural basis of HP1 protein function.
More Related Videos
Related Concept Videos
02:30Histone Variants at the Centromere
4.3K
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...
4.3K
01:49Conserved Binding Sites
4.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.2K
02:38Heterochromatin
12.3K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
12.3K
02:26Conservation of Protein Domains Over Different Proteins
10.8K
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...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
10.8K
02:18Intrinsically Disordered Proteins
17.8K
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...
17.8K
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
829
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
829