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IP3/DAG Signaling Pathway

IP3/DAG Signaling Pathway

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 produces two-second...

Phosphoinositides and PIPs

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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...

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.
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Phosphorylation

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Amplifying Signals via Second Messengers

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...

What are Second Messengers?

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Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...

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Mitochondria-associated ER Membranes (MAMs) and Glycosphingolipid Enriched Microdomains (GEMs): Isolation from Mouse Brain

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Mitochondria: signaling with phosphatidic acid.

Chia-Ying Yang¹, Michael A Frohman

¹Molecular and Cellular Biology Graduate Program and the Department of Pharmacology & Center for Developmental Genetics, Stony Brook University, Stony Brook, NY 11794-5140, USA.

The International Journal of Biochemistry & Cell Biology

|May 22, 2012

Summary

Mitochondria are key players in cell signaling networks, with lipids like phosphatidic acid regulating mitochondrial function. These discoveries offer new therapeutic targets for diseases.

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Area of Science:

Cell Biology
Biochemistry
Mitochondrial Biology

Background:

Mitochondria are increasingly recognized for their roles beyond energy production, participating in cellular signaling.
Lipid second messengers, particularly those generated on the mitochondrial surface, are crucial for these signaling pathways.

Purpose of the Study:

To highlight the significance of phosphatidic acid as a lipid second messenger in mitochondrial function.
To explore the interconnected roles of phosphatidic acid and related lipids in organelle interactions.

Main Methods:

Review of current literature on mitochondrial signaling pathways.
Analysis of lipid metabolism and second messenger generation at the mitochondrial surface.

Main Results:

Phosphatidic acid is a central lipid second messenger, synthesized through multiple pathways.
Phosphatidic acid stimulates the production of other bioactive lipids, influencing mitochondrial function.
These lipid-mediated pathways are involved in inter-organelle communication.

Conclusions:

Emerging roles of phosphatidic acid and associated lipids in mitochondrial function and organelle interactions are significant.
These findings open avenues for therapeutic development in reproduction, metabolism, and neurodegenerative diseases.