Related Experiment Video

Updated: Sep 29, 2026

Isolation of CA1 Nuclear Enriched Fractions from Hippocampal Slices to Study Activity-dependent Nuclear Import of Synapto-nuclear Messenger Proteins
10:03

Isolation of CA1 Nuclear Enriched Fractions from Hippocampal Slices to Study Activity-dependent Nuclear Import of Synapto-nuclear Messenger Proteins

Published on: August 10, 2014

Origin and roles of nuclear matrix proteins. Specific functions of the MAR-binding protein MeCP2/ARBP

W H Strätling1, F Yu

  • 1Institut für Medizinische Biochemie und Molekularbiologie, Universitäts-Krankenhaus Eppendorf, Hamburg, Germany.

Critical Reviews in Eukaryotic Gene Expression
|January 29, 2000
PubMed

Insights

Heterogeneous nuclear ribonucleoproteins (HnRNP) are key nuclear matrix components. MeCP2/ARBP protein binding to matrix attachment regions (MARs) may silence chromatin via histone deacetylase recruitment.

Area of Science:

  • Molecular Biology
  • Chromatin Biology
  • Epigenetics

Background:

  • Heterogeneous nuclear ribonucleoproteins (HnRNP) are major protein constituents of the nuclear matrix.
  • The nuclear matrix serves as a scaffold for nascent RNA transcription and maturation.
  • Chromatin organization involves functional and structural loops in both interphase and mitotic chromosomes.

Purpose of the Study:

  • To explore the roles of functional and structural loops in chromatin organization.
  • To investigate the specific function of the matrix attachment region (MAR)-binding protein MeCP2/ARBP.
  • To elucidate the mechanism by which MeCP2/ARBP contributes to gene silencing.

Main Methods:

  • Review of existing evidence on chromatin loops and nuclear matrix.
  • Analysis of the interaction between MeCP2/ARBP, MARs, and corepressor complexes.
  • Utilizing transfection experiments to validate the proposed gene silencing model.

Main Results:

  • HnRNP proteins are identified as primary components of the nuclear matrix.
  • MeCP2/ARBP protein binds to matrix attachment regions (MARs).
  • MeCP2/ARBP recruits a corepressor complex, including histone deacetylases, via mSin3A interaction.

Conclusions:

  • MeCP2/ARBP plays a specific role in gene regulation at MARs.
  • The interaction of MeCP2/ARBP with corepressors leads to localized silenced chromatin structures.
  • Transfection experiments support the model of MeCP2/ARBP-mediated chromatin silencing.

More Related Videos

Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM06:30

Cell Lineage Analyses and Gene Function Studies Using Twin-spot MARCM

Published on: March 2, 2017

An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants07:44

An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants

Published on: May 22, 2020

Related Concept Videos

Nuclear Export of mRNA02:31

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Microtubule Associated Proteins (MAPs)01:42

Microtubule Associated Proteins (MAPs)

Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
Nuclear Export01:42

Nuclear Export

The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...