GO:0036152 phosphatidylethanolamine acyl-chain remodeling: Lipid Remodeling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0036152 describes the sequential deacylation and re-acylation of phosphatidylethanolamine (PE) to generate PE molecules with different fatty acid acyl chains.
• This remodeling process occurs primarily in the endoplasmic reticulum (ER) and is essential for maintaining membrane lipid diversity and function.
• Key enzymes include phospholipases (e.g., Plb1p) that remove acyl chains and acyltransferases that re-acylate the lysophospholipid intermediate.
• Acyl-chain remodeling of PE and other phospholipids influences membrane curvature, protein sorting, and cellular signaling.
• Dysregulation of phospholipid remodeling has been linked to metabolic disorders, cancer, and peroxisomal biogenesis disorders.
• Advanced mass spectrometry and isotope-labeling techniques are critical for studying PE remodeling dynamics.
Description
Phosphatidylethanolamine (PE) is a major glycerophospholipid in eukaryotic membranes, and its acyl-chain composition determines membrane properties and functions. The biological process GO:0036152, phosphatidylethanolamine acyl-chain remodeling, refers to the post-synthetic modification of PE through cycles of deacylation and re-acylation, allowing cells to adjust the fatty acid composition of PE independently of de novo synthesis. This remodeling is crucial for generating the diverse molecular species of PE found in different cellular membranes. Researchers study this process to understand how membrane lipid diversity is achieved and how it impacts cellular physiology. The remodeling of PE acyl chains has been observed in yeast and mammalian cells, and it involves a network of phospholipases and acyltransferases that act sequentially. The process is particularly important in the endoplasmic reticulum (ER), where lipid remodeling contributes to the unique lipid environment required for protein folding and transport. Moreover, acyl-chain remodeling of PE is interconnected with the metabolism of other phospholipids, such as phosphatidylcholine, and can be influenced by exogenous lipid species. Understanding GO:0036152 provides insights into lipid homeostasis, membrane dynamics, and the pathogenesis of diseases linked to lipid dysfunction.
phosphatidylethanolamine acyl-chain remodeling At A Glance
| GO ID | GO:0036152 |
|---|---|
| GO term | phosphatidylethanolamine acyl-chain remodeling |
| Ontology | biological_process |
| Synonym | phosphatidylethanolamine acyl-chain remodelling |
| Major function | Modifies the acyl chain composition of phosphatidylethanolamine to generate diverse molecular species |
| Subcellular location | Endoplasmic reticulum (ER) and other membranes |
| Key enzymes | Phospholipases (e.g., Plb1p) and acyltransferases |
| Related processes | Phospholipid turnover, membrane lipid homeostasis |
What Is GO:0036152?
Phosphatidylethanolamine acyl-chain remodeling (GO:0036152) is the biological process in which the fatty acid acyl chains attached to the glycerol backbone of phosphatidylethanolamine are enzymatically removed and replaced with different acyl chains. This sequential deacylation and re-acylation generates PE molecules with altered fatty acid compositions, contributing to membrane lipid diversity and functional specialization.
Why Is phosphatidylethanolamine acyl-chain remodeling Important in Cell Biology?
Phosphatidylethanolamine acyl-chain remodeling is fundamental for maintaining membrane lipid diversity and cellular function. It allows cells to adapt their membrane composition in response to metabolic needs and environmental changes, influencing processes such as membrane trafficking, protein function, and signal transduction. Defects in this remodeling pathway have been associated with various diseases, including peroxisomal biogenesis disorders and metabolic syndromes. Therefore, understanding the mechanisms and regulation of PE remodeling is crucial for both basic cell biology and translational research.
• Maintains membrane lipid diversity and proper membrane fluidity.
• Facilitates the generation of specific PE molecular species required for membrane curvature and protein sorting.
• Plays a role in the turnover and quality control of phospholipids in the ER.
• Influences the metabolism of other phospholipids, such as phosphatidylcholine, through interconnected remodeling pathways.
• Is implicated in peroxisomal biogenesis disorders, as shown in Drosophila models.
• Can be studied using isotope-labeled lipids to track acyl chain dynamics.
• Involves enzymes like Plb1p that are conserved from yeast to humans.
• Contributes to cellular responses to exogenous lipids and fatty acid availability.
• Dysregulation may lead to accumulation of abnormal lipid species linked to disease.
• Provides a model system for understanding general principles of lipid remodeling.
What Happens During phosphatidylethanolamine acyl-chain remodeling?
Deacylation of phosphatidylethanolamine
In simple terms: First, an enzyme removes one or both fatty acid chains from PE.
The remodeling process begins with the removal of acyl chains from phosphatidylethanolamine by phospholipases. In yeast, the phospholipase B Plb1p has been shown to be involved in the deacylation of phosphatidylcholine and likely plays a similar role for PE. This step generates lysophosphatidylethanolamine (LPE) or glycerophosphoethanolamine, which serve as intermediates for subsequent re-acylation. The deacylation step is crucial for providing the substrate for the next phase of remodeling.
Re-acylation with new acyl chains
In simple terms: Then, another enzyme adds a different fatty acid chain to the lysophospholipid.
Following deacylation, lysophosphatidylethanolamine is re-acylated by acyltransferases, which transfer acyl chains from acyl-CoA donors or other phospholipids to the lysophospholipid. This re-acylation step incorporates new fatty acid species into PE, resulting in a remodeled PE molecule with a different acyl chain composition. The specificity of acyltransferases determines which fatty acids are incorporated, contributing to the diversity of PE molecular species observed in cells.
Role of the endoplasmic reticulum
In simple terms: Most of this remodeling happens in the ER, a cellular organelle.
The endoplasmic reticulum (ER) is the primary site for phospholipid synthesis and remodeling. Studies have shown that acyl chain remodeling of PE occurs in the ER and is essential for generating the distinct molecular species of PE that are sorted to other membranes. The ER contains the enzymes responsible for both deacylation and re-acylation, and the remodeling process is tightly linked to lipid homeostasis and membrane trafficking.
Interplay with other phospholipid remodeling pathways
In simple terms: PE remodeling is connected to the remodeling of other lipids like phosphatidylcholine.
Phosphatidylethanolamine acyl-chain remodeling is not an isolated process; it intersects with the remodeling of other phospholipids. For example, studies in yeast have shown that acyl-chain remodeling of phosphatidylcholine involves similar enzymes and can affect PE composition. Additionally, exogenous short-chain phosphatidylcholine can be incorporated and remodeled, influencing the overall lipid landscape. This interconnectedness ensures coordinated regulation of membrane lipid composition.
Techniques to study PE remodeling
In simple terms: Scientists use mass spectrometry and isotopes to watch the remodeling process.
Advanced analytical techniques such as electrospray ionization tandem mass spectrometry (ESI-MS/MS) have been instrumental in characterizing the molecular species of PE and other phospholipids in subcellular membranes. The use of heavy isotope-labeled lipid species allows researchers to track the incorporation and remodeling of specific acyl chains over time, providing detailed insights into the dynamics of PE remodeling. These methods have revealed that remodeling is a rapid and selective process that contributes to the unique lipid profiles of different organelles.
Key Genes Involved in GO:0036152 phosphatidylethanolamine acyl-chain remodeling
The following genes and proteins are key players in phosphatidylethanolamine acyl-chain remodeling, as identified in model organisms and biochemical studies.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PLB1 | Phospholipase B involved in deacylation of phospholipids | Shown to mediate acyl chain remodeling of phosphatidylcholine and likely PE |
| ALE1 | Acyltransferase that re-acylates lysophospholipids | Involved in PE remodeling in yeast |
| SLC1 | Acyltransferase for lysophosphatidylethanolamine | Potential role in PE re-acylation |
| TAZ1 | Transacylase in phospholipid remodeling | May contribute to PE acyl chain turnover |
| CKI1 | Choline kinase, indirectly affects PE remodeling | Links PC and PE metabolism |
| PCT1 | Phosphatidylcholine transfer protein | Affects phospholipid remodeling |
| PLB2 | Phospholipase B homolog | Potential role in PE deacylation |
| PLB3 | Phospholipase B homolog | Potential role in PE deacylation |
| LPL1 | Lysophospholipase | May participate in deacylation |
| LRO1 | Acyltransferase | Involved in phospholipid remodeling |
| DGA1 | Diacylglycerol acyltransferase | Indirectly affects PE remodeling |
| ARE1 | Acyl-CoA:sterol acyltransferase | May influence acyl-CoA pools |
| ARE2 | Acyl-CoA:sterol acyltransferase | May influence acyl-CoA pools |
| FAA1 | Fatty acid activation | Provides acyl-CoA for re-acylation |
| FAA2 | Fatty acid activation | Provides acyl-CoA for re-acylation |
| PXA1 | Peroxisomal fatty acid transporter | Affects fatty acid availability |
| PXA2 | Peroxisomal fatty acid transporter | Affects fatty acid availability |
| PEX5 | Peroxisomal biogenesis factor | Linked to peroxisomal disorders affecting lipids |
How Is phosphatidylethanolamine acyl-chain remodeling Regulated?
The regulation of phosphatidylethanolamine acyl-chain remodeling is not fully understood, but it is likely controlled by the availability of acyl-CoA substrates, the expression and activity of phospholipases and acyltransferases, and cellular lipid status. Studies in yeast have shown that remodeling is influenced by the type of fatty acids available and can be modulated by exogenous lipids. Additionally, the process may be subject to feedback regulation to maintain membrane lipid homeostasis. However, specific regulatory pathways such as mTOR or ISR have not been directly implicated in PE remodeling in the provided literature.
phosphatidylethanolamine acyl-chain remodeling and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PEX5 | Peroxisomal biogenesis disorder | Drosophila knockout |
| PLB1 | Lipid remodeling defects | Yeast knockout |
| ALE1 | Membrane lipid imbalance | Yeast knockout |
| TAZ1 | Barth syndrome-like lipid abnormalities | Yeast knockout |
| SLC1 | Potential metabolic syndrome | Mouse knockout |
Peroxisomal biogenesis disorders
Peroxisomal biogenesis disorders (PBDs) are a group of genetic diseases caused by defects in peroxisome formation. Recent studies using Drosophila models have uncovered substrate channeling effects on phospholipids and sphingolipids in PBDs, suggesting that peroxisomal dysfunction can impact phosphatidylethanolamine remodeling. This link highlights the importance of PE remodeling in normal peroxisomal function and disease pathology.
Metabolic disorders
Alterations in phospholipid remodeling, including PE acyl-chain remodeling, have been associated with metabolic disorders such as obesity and insulin resistance. Although direct evidence from the provided citations is limited, the role of PE in membrane function and signaling suggests that dysregulation could contribute to metabolic disease.
Cancer
Cancer cells often exhibit altered lipid metabolism, including changes in phospholipid composition. While specific studies on PE remodeling in cancer are not cited here, the general importance of lipid remodeling in cell proliferation and survival implies a potential role.
From phosphatidylethanolamine acyl-chain remodeling-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of PLB1 in PE remodeling? | Yeast PLB1 knockout |
| How does ALE1 affect PE acyl chain composition? | Yeast ALE1 knockout |
| Does PEX5 mutation alter PE remodeling? | Drosophila PEX5 knockout |
| What is the effect of TAZ1 deletion on PE species? | Yeast TAZ1 knockout |
| Can exogenous lipids influence PE remodeling? | Yeast treated with labeled lipids |
| How does PE remodeling change in cancer cells? | Human cancer cell lines with CRISPR KO of remodeling genes |
How to Study the phosphatidylethanolamine acyl-chain remodeling Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ESI-MS/MS | Molecular species of PE and other phospholipids | Profiling lipid composition in yeast and mammalian cells |
| Isotope labeling + MS | Dynamics of acyl chain incorporation | Tracking remodeling over time |
| Yeast knockout screens | Effect of gene deletion on PE species | Identifying remodeling enzymes |
| Lipidomics | Global lipid changes | Comparing wild-type and mutant cells |
| Fluorescence microscopy | Subcellular localization of lipids | Visualizing PE distribution |
| CRISPR/Cas9 knockout | Gene function in PE remodeling | Creating isogenic mutant cell lines |
| RNA-seq | Expression of remodeling enzymes | Transcriptional regulation |
| Proteomics | Protein abundance and interactions | Identifying remodeling complexes |
Mass spectrometry for lipid profiling
Electrospray ionization tandem mass spectrometry (ESI-MS/MS) is a powerful method to analyze the molecular species composition of phosphatidylethanolamine and other phospholipids. This technique has been used to reveal acyl chain-based sorting and remodeling of distinct molecular species en route to the plasma membrane in yeast. It allows precise quantification of PE species with different acyl chains, providing insights into remodeling dynamics.
Isotope labeling to track remodeling
The use of heavy isotope-labeled lipid species, combined with mass spectrometry, enables researchers to follow the incorporation and remodeling of specific acyl chains over time. This approach has provided detailed information on aminophospholipid acyl chain remodeling in yeast. By feeding cells with labeled precursors, one can monitor deacylation and re-acylation events.
Genetic screens and knockouts
Yeast genetics is a powerful tool to study PE remodeling. Knockout mutants of candidate genes, such as PLB1 and ALE1, can be analyzed for changes in PE molecular species using lipidomics. These studies help identify the enzymes responsible for specific remodeling steps.
Fluorescence microscopy and imaging
Imaging techniques can visualize the distribution of PE and other lipids in live cells. While not directly cited in the provided references, fluorescence microscopy with lipid-binding probes can complement mass spectrometry data to understand spatial aspects of remodeling.
How CRISPR Can Be Used to Study GO:0036152 phosphatidylethanolamine acyl-chain remodeling
Knockout
CRISPR/Cas9 knockout of genes involved in phosphatidylethanolamine acyl-chain remodeling, such as PLB1 or ALE1, allows researchers to study their loss-of-function phenotypes. Yeast knockout models have been instrumental in identifying the roles of these enzymes in PE remodeling. In human cells, knockout of homologous genes can reveal their contribution to lipid homeostasis and disease.
Point Mutation
Introducing point mutations in catalytic residues of remodeling enzymes can dissect their enzymatic activity. For example, mutating the active site of Plb1p can distinguish its phospholipase activity from other functions. Such models are valuable for understanding structure-function relationships.
Knock-in
Knock-in of tagged versions of remodeling enzymes, such as GFP-fused Plb1p, enables visualization and immunoprecipitation studies. This approach can reveal the subcellular localization and interaction partners of the enzymes in the ER.
Overexpression
Overexpression of remodeling enzymes can lead to altered PE composition and membrane properties. For instance, overexpressing PLB1 in yeast may increase deacylation and affect lipid homeostasis. This can be used to study the consequences of enhanced remodeling.
How EDITGENE Supports phosphatidylethanolamine acyl-chain remodeling Research
Researchers studying phosphatidylethanolamine acyl-chain remodeling-related genes often need to determine whether a candidate gene is causally involved in the process or contributes to disease. EDITGENE provides comprehensive CRISPR-based services to create precise cell and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for phosphatidylethanolamine acyl-chain remodeling research.
Frequently Asked Questions About phosphatidylethanolamine acyl-chain remodeling
What is phosphatidylethanolamine acyl-chain remodeling?
It is the biological process (GO:0036152) where the fatty acid chains of phosphatidylethanolamine are removed and replaced with different chains, generating diverse PE molecules.
What genes are involved in phosphatidylethanolamine acyl-chain remodeling?
Key genes include PLB1, ALE1, TAZ1, and SLC1, which encode phospholipases and acyltransferases.
Where does phosphatidylethanolamine acyl-chain remodeling occur?
It primarily occurs in the endoplasmic reticulum (ER).
Why is phosphatidylethanolamine acyl-chain remodeling important?
It maintains membrane lipid diversity and is linked to peroxisomal disorders and metabolic diseases.
How is phosphatidylethanolamine acyl-chain remodeling studied?
Using mass spectrometry, isotope labeling, and genetic knockouts in yeast and other models.
What is the role of PLB1 in PE remodeling?
PLB1 encodes a phospholipase B that deacylates phospholipids, including PE, as part of the remodeling cycle.
Can CRISPR be used to study PE remodeling?
Yes, CRISPR knockout of remodeling genes in cell lines allows functional studies.
What diseases are associated with defects in PE remodeling?
Peroxisomal biogenesis disorders and potentially metabolic syndromes.
What are the synonyms for GO:0036152?
The synonym is phosphatidylethanolamine acyl-chain remodelling.
How does PE remodeling differ from de novo synthesis?
Remodeling modifies existing PE molecules, while de novo synthesis creates PE from precursors.
Conclusion
Phosphatidylethanolamine acyl-chain remodeling (GO:0036152) is a vital cellular process that ensures the production of diverse PE molecular species tailored to specific membrane functions. Through the coordinated action of phospholipases and acyltransferases, cells can rapidly adjust their lipid composition in response to metabolic demands. This process is conserved from yeast to humans and has implications for health and disease, particularly in peroxisomal disorders. Continued research using advanced lipidomics and CRISPR models will further unravel the regulatory mechanisms and therapeutic potential of targeting PE remodeling.
References
- 1. Patton-Vogt J et al.. 2020. Phospholipid turnover and acyl chain remodeling in the yeast ER.. Biochim Biophys Acta Mol Cell Biol Lipids 1865(1):158462 PMID: 31146038
- 2. Renne MF et al.. 2015. Lipid Acyl Chain Remodeling in Yeast.. Lipid Insights 8(Suppl 1):33-40 PMID: 26819558
- 3. Kishino H et al.. 2014. Acyl-chain remodeling of dioctanoyl-phosphatidylcholine in Saccharomyces cerevisiae mutant defective in de novo and salvage phosphatidylcholine synthesis.. Biochem Biophys Res Commun 445(2):289-93 PMID: 24491568
- 4. De Smet CH et al.. 2013. Yeast cells accumulate excess endogenous palmitate in phosphatidylcholine by acyl chain remodeling involving the phospholipase B Plb1p.. Biochim Biophys Acta 1831(6):1167-76 PMID: 23501167
- 5. Schneiter R et al.. 1999. Electrospray ionization tandem mass spectrometry (ESI-MS/MS) analysis of the lipid molecular species composition of yeast subcellular membranes reveals acyl chain-based sorting/remodeling of distinct molecular species en route to the plasma membrane.. J Cell Biol 146(4):741-54 PMID: 10459010
- 6. Wangler MF et al.. 2025. Drosophila models uncover substrate channeling effects on phospholipids and sphingolipids in peroxisomal biogenesis disorders.. PLoS One 20(6):e0324143 PMID: 40498764
- 7. Tanaka K et al.. 2008. Incorporation and remodeling of extracellular phosphatidylcholine with short acyl residues in Saccharomyces cerevisiae.. Biochim Biophys Acta 1781(8):391-9 PMID: 18599377
- 8. Kainu V et al.. 2008. Electrospray ionization mass spectrometry and exogenous heavy isotope-labeled lipid species provide detailed information on aminophospholipid acyl chain remodeling.. J Biol Chem 283(6):3676-3687 PMID: 18056998
