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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...

cAMP-dependent Protein Kinase Pathways

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...

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...

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Related Experiment Video

Updated: Jun 3, 2026

Identification of Kinase-substrate Pairs Using High Throughput Screening

Identification of Kinase-substrate Pairs Using High Throughput Screening

Published on: August 29, 2015

Phosphorylation, protein kinases and ADPKD.

¹Department of Neurochemistry, NY State Institute for Basic Research in Developmental Disabilities, New York, NY, USA. xiaohong.li@omr.state.ny.us

Biochimica Et Biophysica Acta

|March 12, 2011

Summary

This summary is machine-generated.

Autosomal dominant polycystic kidney disease (ADPKD) results from mutations in PKD1 and PKD2 genes. The encoded polycystin proteins prevent kidney cyst formation, but the exact mechanisms remain unclear.

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Last Updated: Jun 3, 2026

Identification of Kinase-substrate Pairs Using High Throughput Screening

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Published on: April 29, 2022

Area of Science:

Nephrology
Genetics
Molecular Biology

Background:

Autosomal dominant polycystic kidney disease (ADPKD) is a genetic disorder.
It is characterized by the development of renal cysts.
Mutations in the PKD1 and PKD2 genes cause ADPKD.

Purpose of the Study:

To review the roles of polycystin-1 (PC-1) and polycystin-2 (PC-2) proteins in ADPKD.
To explore the molecular mechanisms underlying cystogenesis in ADPKD.
To understand the function of the PC-1/PC-2 complex in preventing cyst formation.

Main Methods:

Review of existing literature on ADPKD, PKD1, and PKD2.
Analysis of the known functions and signaling pathways involving PC-1 and PC-2.
Discussion of the structural and functional relationship between PC-1 and PC-2.

Main Results:

PC-1 is a large plasma membrane receptor regulating multiple signaling pathways (Wnt, AP-1, PI3K/Akt, ERK, mTOR, etc.).
PC-2 functions as a calcium channel.
PC-1 and PC-2 form a functional complex crucial for preventing renal cyst formation.

Conclusions:

The precise mechanisms by which the PC-1/PC-2 complex prevents cyst formation are still largely unknown.
Further research is needed to elucidate these mechanisms for potential therapeutic targets in ADPKD.
Understanding these pathways is critical for advancing ADPKD research.