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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...

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...

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...

Phosphoinositides and PIPs

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...

Polyprotic Acids

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:

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Updated: May 9, 2026

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

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

Published on: April 29, 2022

Structure of Acid phosphatases.

César L Araujo¹, Pirkko T Vihko

¹Department of Clinical Chemistry, Institute of Clinical Medicine, University of Helsinki, Helsinki, Finland.

Methods in Molecular Biology (Clifton, N.J.)

|July 18, 2013

Summary

Acid phosphatases are enzymes with diverse structures and functions, crucial in various pathophysiological conditions. Understanding their distinct properties aids in developing diagnostic and therapeutic strategies for diseases like cancer and osteoporosis.

Area of Science:

Biochemistry
Enzymology
Molecular Biology

Background:

Acid phosphatases (APs) are enzymes implicated in various pathophysiological conditions.
Their dysregulation is linked to diseases such as prostate cancer and osteoporosis.
APs are found across mammalian and non-mammalian species, exhibiting structural similarities.

Purpose of the Study:

To elucidate the structural and functional diversity of acid phosphatases.
To highlight the clinical relevance of APs in diagnostics and therapeutics.
To clarify the classification and nomenclature of different APs.

Main Methods:

Review of existing literature on acid phosphatase structure, function, and classification.
Analysis of pioneering crystallization studies.

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Last Updated: May 9, 2026

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

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

Published on: April 29, 2022

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase

Published on: December 19, 2011

Colorimetric Analysis of Alkaline Phosphatase Activity in S. aureus Biofilm

Colorimetric Analysis of Alkaline Phosphatase Activity in S. aureus Biofilm

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Comparison of enzymatic properties, cofactor dependencies, and inhibitor sensitivities.

Main Results:

Acid phosphatases catalyze the hydrolysis of phosphate monoesters at acidic pH.
Enzymes exhibit structural heterogeneity, leading to varied substrate specificities and cofactor requirements.
Distinctions exist in tartrate inhibition, differentiating prostatic AP from tartrate-resistant and erythrocytic APs.
Structural classification includes histidine APs, low molecular weight protein tyrosine APs, and metal-ion dependent phosphatases.

Conclusions:

Acid phosphatases represent a heterogeneous enzyme group with significant clinical implications.
Understanding structural and functional differences is key for accurate classification and application.
Clarifying nomenclature is essential to avoid confusion in research and clinical settings.