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Related Concept Videos

Protein Modifications in the RER01:26

Protein Modifications in the RER

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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal...
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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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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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Super-resolution Fluorescence Microscopy01:37

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques
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Protein modification for single molecule fluorescence microscopy.

Mark S Dillingham1, Mark I Wallace

  • 1DNA-protein Interactions Unit, Department of Biochemistry, University of Bristol, Bristol, UKBS8 1TD. mark.dillingham@bristol.ac.uk

Organic & Biomolecular Chemistry
|August 14, 2008
PubMed
Summary
This summary is machine-generated.

Single molecule microscopy offers powerful biological insights. This study reviews current experiments, detailing limitations in fluorescent labels and protein modification techniques for advanced microscopy applications.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Microscopy

Background:

  • Single molecule methods provide unprecedented resolution in biological research.
  • Understanding molecular mechanisms requires observing individual biomolecules in action.

Purpose of the Study:

  • To provide an overview of current single molecule experiments.
  • To assess limitations of fluorescent labels and protein modification for single molecule microscopy.

Main Methods:

  • Review of existing literature and experimental techniques in single molecule microscopy.
  • Analysis of challenges associated with fluorescent labeling strategies.
  • Evaluation of protein modification methods for biomolecular imaging.

Main Results:

  • Current single molecule experiments span diverse biological investigations.
  • Fluorescent labels present challenges in photostability and specific targeting.
  • Protein modification techniques require optimization for minimal perturbation.

Conclusions:

  • Single molecule microscopy is a rapidly advancing field with significant potential.
  • Overcoming limitations in labeling and modification is crucial for future progress.
  • Further development is needed to fully exploit the capabilities of single molecule imaging.