Endogenous Phosphatase Inactivation
Endogenous Phosphatase Inactivation - Related Videos
02:54
Protein Kinases and Phosphatases
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2020
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven. Protein kinases Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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X-Inactivation
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2019
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results. Instead, in order to avoid this potential issue, female mammalian cells inactivate nearly all the genes in one of their X chromosomes during early embryonic development. In the nuclear envelope surrounding the cell nucleus, the inactivated X chromosome...
01:58
X-inactivation
0 Views •
2021
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results. Instead, in order to avoid this potential issue, female mammalian cells inactivate nearly all the genes in one of their X chromosomes during early embryonic development. In the nuclear envelope surrounding the cell nucleus, the inactivated X chromosome...
01:22
Activation and Inactivation of G Proteins
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2023
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
08:45
Assessing Cellular Target Engagement by SHP2 (PTPN11) Phosphatase Inhibitors
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Cited by 4 •
2020
The ability to assess target engagement by candidate inhibitors in intact cells is crucial for drug discovery. This protocol describes a 384 well format cellular thermal shift assay that reliably detects cellular target engagement of inhibitors targeting either wild-type SHP2 or its oncogenic variants.
FAQs
Phosphatases can continue removing phosphate groups after a sample is collected, changing the molecular state that existed in the biological system. Applying an inactivation strategy during preparation limits this post-collection alteration. As a result, later measurements more closely reflect the original phosphorylation pattern rather than changes introduced while the sample was being handled.
Inhibitors or deliberately selected conditions interfere with the catalytic function of endogenous phosphatases. When catalytic activity falls, these enzymes become less able to remove phosphate groups from proteins, nucleic acids, or other cellular components. The effectiveness of the approach therefore depends on maintaining conditions that sufficiently restrict phosphatase action throughout the relevant preparation and analysis steps.
The outcome depends on how effectively the selected condition or inhibitor suppresses phosphatase activity and how consistently that control is maintained during handling. Inadequate suppression can allow continued dephosphorylation, while effective control better preserves the phosphorylation state. This distinction matters because downstream results may otherwise reflect preparation-related loss of phosphate groups rather than biological regulation.
Phosphorylation studies examine phosphate-dependent molecular states and their biological consequences, whereas endogenous phosphatase inactivation is a sample-control step that protects those states during preparation. It does not replace measurement of phosphorylation or explain its cellular regulation. Instead, it supports more reliable analysis by reducing unwanted dephosphorylation before the experimental readout is obtained.
A general workflow is to collect the sample, introduce conditions or inhibitors that reduce endogenous phosphatase activity, and maintain that control during subsequent preparation and analysis. The treated material can then be examined for phosphorylation-dependent features. Each stage should minimize opportunities for phosphatases to remain active, because activity during handling can alter the result before measurement.
This approach is useful whenever researchers need to examine phosphorylation-dependent molecular information after sample collection. Relevant applications include studies of cell signaling, enzyme regulation, protein modification, and phosphorylation-dependent molecular interactions. By limiting preparation-related dephosphorylation, the method helps distinguish biological differences in phosphorylation from changes caused by sample handling.
Endogenous phosphatase inactivation can help preserve the phosphorylation state of proteins, nucleic acids, and other cellular components. That preserved state may support analysis of molecular interactions, regulatory changes, or signaling-related differences. The value is interpretive as well as technical: retained phosphorylation provides a more accurate basis for connecting an observed molecular pattern with its biological context.
Cell-signaling analyses often depend on phosphorylation as an indicator of molecular regulation. If endogenous phosphatases remain active during preparation, they may remove phosphate groups and weaken or alter the observed signal. Controlling their activity helps protect the relevant molecular state, improving confidence that differences in the analysis reflect biology rather than dephosphorylation introduced after collection.