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Related Concept Videos

Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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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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Phosphorylation01:02

Phosphorylation

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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...
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IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

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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,...
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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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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...
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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Related Experiment Video

Updated: Aug 17, 2025

Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag
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Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag

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Phosphorylation of DGK.

Xin Barbernitz1, Daniel M Raben2

  • 1Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Advances in Biological Regulation
|December 12, 2022
PubMed
Summary

Diacylglycerol kinases (DGKs) regulate signaling lipids phosphatidic acid and diacylglycerol. This review focuses on phosphorylation, a key post-translational modification impacting DGK function and activity.

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Last Updated: Aug 17, 2025

Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag
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Oligopeptide Competition Assay for Phosphorylation Site Determination
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Diacylglycerol (DAG) and phosphatidic acid (PtdOH) are crucial signaling lipids involved in various cellular processes.
  • Diacylglycerol kinases (DGKs) are enzymes that interconvert DAG and PtdOH, thereby regulating their cellular levels and downstream signaling.
  • Understanding the regulation of DGKs is vital due to their central role in lipid signaling pathways.

Purpose of the Study:

  • To review the current knowledge on post-translational modifications (PTMs) of DGKs.
  • To specifically focus on the role of phosphorylation as a PTM in modulating DGK activity and function.
  • To highlight the importance of understanding DGK regulation for cellular signaling.

Main Methods:

  • Literature review synthesizing existing research on DGK phosphorylation.
  • Analysis of studies investigating the impact of phosphorylation on DGK catalytic activity and substrate specificity.
  • Discussion of potential functional consequences of DGK phosphorylation in various signaling cascades.

Main Results:

  • Phosphorylation is a significant post-translational modification affecting DGK activity.
  • Specific phosphorylation sites and their regulatory roles are beginning to be elucidated.
  • This modification influences the enzyme's interaction with substrates and its localization within the cell.

Conclusions:

  • Phosphorylation plays a critical role in the regulation of diacylglycerol kinase function.
  • Further research into DGK PTMs, particularly phosphorylation, is essential for a comprehensive understanding of lipid signaling.
  • Elucidating these regulatory mechanisms can provide insights into diseases associated with aberrant lipid signaling.