Reader Writer Complex
Reader Writer Complex - Related Videos
07:51
Introduction to the Microplate Reader
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2023
The microplate reader is a multimodal instrument that allows for a variety of experiments to be performed and measured simultaneously. Microplate readers can make absorbance, fluorescence and luminescence measurements. Multiwell plates are integral to the microplate reader and allow for many experiments to be performed at once. Regardless of the assay type, experiments on the plate reader utilize a standard curve to determine the experimental values. This curve uses samples of known...
03:01
Precise and High-Throughput Analysis of Bacterial Growth Using a Microplate Reader
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2025
Source: Kurokawa, M., et al. Precise, High-throughput Analysis of Bacterial Growth. J. Vis. Exp. (2017)This video demonstrates the high-throughput quantification of bacterial growth using a microplate reader. It outlines the steps involved in culture preparation, optical density measurement, and analysis of growth dynamics.
02:25
Spreading of Chromatin Modifications
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2020
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 The writer is an enzyme that can...
03:13
Mitochondrial Calcium Uptake Assay: A Plate Reader-Based Method for Measuring Calcium Uptake in Isolated Mitochondria
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2025
This video describes a plate reader-based assay to measure mitochondrial calcium uptake in isolated mitochondria. The assay analyzes the fluorescence signal of a calcium-sensitive fluorescent dye to study the kinetics of mitochondrial calcium uptake and calcium overload.
08:42
Coordination Chemistry Complexes
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2023
Source: Laboratory of Dr. Neal Abrams — SUNY College of Environmental Science and Forestry Transition metals are found everywhere from vitamin supplements to electroplating baths. Transition metals also make up the pigments in many paints and compose all minerals. Typically, transition metals are found in the cationic form since they readily oxidize, or lose electrons, and are surrounded by electron donors called ligands. These ligands do not form ionic or covalent bonds with the metal center,...
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Recognition supplies the targeting step: a reader domain binds a specific chemical tag on histones or DNA, positioning the complex near adjacent nucleosomes. The writer domain can then add a corresponding modification nearby. This coupling links an existing signal to its local reinforcement, helping preserve either a more accessible or more condensed chromatin environment.
Neighboring nucleosomes provide a local sequence of chromatin substrates rather than isolated targets. When a writer modifies these nearby units, the resulting pattern can extend the influence of the initial mark across a genomic region. That spatial organization is relevant because accessibility or condensation across the region can affect how genes and other DNA-associated processes are regulated.
The chemical identity of the existing mark is a central determinant. Reader domains recognize particular tags located on histones or DNA, so the complex responds only where a compatible signal is present. This selectivity connects the starting epigenetic information with the corresponding modification deposited by the writer domain, rather than producing an indiscriminate change throughout the genome.
Reader domains interpret information already present in chromatin, whereas writer domains act on that interpretation by adding a matching modification to nearby nucleosomes. Their cooperation creates a molecular link between recognition and propagation. Separating these roles allows the complex to use local epigenetic information as a guide for maintaining a regional chromatin state.
Reader Writer Complexes influence gene expression, DNA replication, and cellular differentiation by helping regulate chromatin accessibility and condensation. Their effects therefore extend beyond a single modification event: they can shape whether genomic regions remain available or become restricted during important cellular activities. This makes them relevant to both genome regulation and changes in cell identity.
These complexes provide a framework for examining how epigenetic information is maintained as cells regulate genomic regions and adopt different identities. If chromatin regulation is disrupted, the resulting changes in local accessibility or condensation may interfere with normal development or cellular function. Studying the complexes can therefore connect altered chromatin states with developmental abnormalities and disease-related processes.