Secretion Modification Region
Secretion Modification Region - Related Videos
02:32
Histone Modification
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2020
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 The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
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...
04:20
Functional Assessment of Antibody-Secreting B Cells Using ELISpot Assay
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2025
This video demonstrates the use of the ELISpot assay to assess the function of antibody-secreting B cells, ASCs. The antibodies secreted by the ASCs interact with the membrane-bound polyclonal antibody fragments, which are detected by the enzyme-conjugated IgG or IgM antibodies. The colored spot produced in each well indicates the presence of the specific antibody's isotype, which correlates with the B cells' secretory activity.
03:37
Quantifying Polarity and Dynamics of a Secretion System Component in Legionella pneumophila
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2025
Source: Chetrit, D., et al. Applying Live Cell Imaging and Cryo-Electron Tomography to Resolve Spatiotemporal Features of the Legionella pneumophila Dot/Icm Secretion System. J. Vis. Exp. (2020)This video demonstrates the use of live-cell fluorescence imaging to quantify the polarity and dynamics of secretion system components in Legionella pneumophila, enabling analysis of spatial recruitment and cytosolic redistribution critical for understanding bacterial...
01:03
IR Frequency Region: Fingerprint Region
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2024
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1. The...
FAQs
Signal sequences guide a newly produced protein into the cellular secretory pathway, whereas a secretion modification region helps regulate what happens afterward. As the protein passes through the endoplasmic reticulum and Golgi apparatus, this region can influence processing, chemical modification, and trafficking. Their coordinated action helps determine whether the exported protein reaches a functional destination.
These compartments provide sequential environments for preparing secreted proteins. Entry into the endoplasmic reticulum places the protein within the export pathway, while movement through the Golgi exposes it to resident enzymes that can cleave, glycosylate, or otherwise modify it. The resulting processing can affect delivery and help produce mature hormones, enzymes, receptors, or extracellular matrix components.
A sequence-based region is identified through the amino acid order within a secreted protein, while a structural domain refers to a three-dimensional feature that contributes to processing, modification, or trafficking. Both descriptions focus on regulatory information rather than the protein’s overall identity. Examining either feature can help explain how a protein is handled during cellular export.
Changes in this region may alter how a protein is processed, chemically modified, or trafficked through the secretory pathway. Because these steps contribute to delivery and functional maturation, altered regional information can affect the properties of the exported product. This makes such regions relevant to investigations of secretion defects and to efforts to design proteins with defined characteristics.
Researchers examine these regions in the context of protein targeting, movement through the endoplasmic reticulum and Golgi apparatus, and enzyme-dependent processing. They can relate regional features to outcomes such as cleavage, glycosylation, other chemical modifications, or delivery. This approach connects sequence or structure with the behavior of secreted hormones, enzymes, receptors, and extracellular matrix components.
These regions provide design-relevant information about how a protein enters an export pathway and acquires processing or chemical modifications before delivery. Understanding that information can support the development of engineered proteins with defined properties. The same knowledge also helps interpret why secretion defects occur and how protein targeting relates to biotechnology applications.