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Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

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...

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

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...

Transducer Mechanism: Enzyme-Linked Receptors

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:

Phosphorylation

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...

Amplifying Signals via Enzymatic Cascade

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...

Regulated Protein Degradation

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...

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Related Experiment Video

Updated: May 17, 2026

Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays

Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays

Published on: August 13, 2017

Bioengineered protein phosphatase 2A: update on need.

Juan A Rubiolo, Henar López-Alonso, Amparo Alfonso

|October 25, 2012

Summary

Harmful algal blooms produce toxins that inhibit protein phosphatase 2A. Recombinant human protein phosphatase 2A expressed in insect larvae offers a stable and reliable source for toxin detection kits.

Keywords:

eutrophication harmful algal blooms insect larvae natural toxin detection recombinant PP2AC

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Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays

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A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors

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Published on: April 29, 2022

Area of Science:

Environmental Science
Biochemistry
Toxicology

Background:

Harmful algal blooms (HABs) are increasing globally due to climate change and eutrophication.
Certain HABs produce potent toxins, including okadaic acid, dinophysistoxins, and microcystins.
These toxins inhibit protein phosphatase 2A (PP2A), a key enzyme in cellular regulation.

Discussion:

Traditional methods using animal-derived PP2A for toxin detection were limited by enzyme instability and variability.
Recombinant protein expression offers a solution to produce stable and consistent enzyme quantities.
This study investigated the expression of human PP2A catalytic subunit alpha in insect larvae.

Key Insights:

The insect larvae expression system successfully produced active and specific human PP2A.
The recombinant enzyme exhibited high stability, making it suitable for diagnostic applications.
This system provides a reliable source for large-scale production of PP2A for toxin detection.

Outlook:

The insect larvae expression system can be a valuable tool for developing robust diagnostic kits for algal toxins.
Further research could optimize expression levels and explore other applications of recombinant PP2A.
This approach contributes to monitoring and mitigating the risks associated with harmful algal blooms.