GO:1904144 phosphatidylinositol phosphate phosphatase complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1904144 describes a protein complex that carries phosphatidylinositol phosphate phosphatase activity, enabling it to remove phosphate groups from phosphatidylinositol phosphates.
• The complex is linked to the prostatic acid phosphatase (PAP/ACPP) protein, which is a major component of the complex and is known to dephosphorylate phosphatidylinositol phosphates.
• Phosphatidylinositol phosphate phosphatases are critical for cellular signaling, membrane trafficking, and autophagy, processes that are often dysregulated in diseases such as cancer and neurodegeneration [1,2,3].
• Research on this complex often employs CRISPR knockout, point mutation, and knock-in models to dissect its role in lipid signaling and disease [4,5].
• Dysregulation of phosphatidylinositol phosphate phosphatases has been implicated in liver disease, Parkinson's disease, and cancer, making it a potential therapeutic target [1,2,6].
• Studying GO:1904144 requires a combination of biochemical assays, imaging, and omics approaches to understand its assembly and function [7,8].
Description
The phosphatidylinositol phosphate phosphatase complex (GO:1904144) is a cellular component defined by its ability to catalyze the removal of phosphate groups from phosphatidylinositol phosphates (PIPs). PIPs are key signaling lipids that regulate diverse cellular processes, including membrane trafficking, autophagy, and cell survival [1,2]. The complex is perhaps best known for its association with prostatic acid phosphatase (PAP), a protein that exhibits phosphatidylinositol phosphate phosphatase activity and is implicated in various physiological and pathological contexts. Understanding this complex is essential for researchers studying lipid signaling, as its activity directly impacts the levels and localization of PIPs, which in turn influence downstream signaling pathways. Moreover, the complex has been linked to diseases such as cancer, liver disease, and neurodegenerative disorders, underscoring its clinical relevance [1,2,6]. This article provides a comprehensive overview of the complex's definition, components, mechanisms, and research methodologies, with a focus on how CRISPR-based models can accelerate discovery.
phosphatidylinositol phosphate phosphatase complex At A Glance
| GO ID | GO:1904144 |
|---|---|
| GO term | phosphatidylinositol phosphate phosphatase complex |
| Ontology | cellular_component |
| Synonym | prostatic acid phosphatase complex |
| Major function | Catalyzes the dephosphorylation of phosphatidylinositol phosphates, regulating lipid signaling and membrane dynamics. |
| Associated gene | ACPP (prostatic acid phosphatase) is a known component. |
| Related processes | Autophagy, membrane trafficking, cell signaling [1,2,3]. |
| Disease relevance | Implicated in cancer, liver disease, and Parkinson's disease [1,2,6]. |
What Is GO:1904144?
According to the Gene Ontology, GO:1904144 refers to a protein complex that possesses phosphatidylinositol phosphate phosphatase activity. In other words, it is a molecular machine made of proteins that can remove phosphate groups from phosphatidylinositol phosphates, a class of membrane lipids involved in signal transduction. The complex is synonymous with the prostatic acid phosphatase complex, highlighting the role of the ACPP gene product as a key constituent.
Why Is phosphatidylinositol phosphate phosphatase complex Important in Cell Biology?
The phosphatidylinositol phosphate phosphatase complex is important because it directly modulates the levels of phosphatidylinositol phosphates, which are central to a myriad of cellular processes, including autophagy, endocytosis, and signal transduction [1,2]. Dysregulation of this complex can lead to altered lipid signaling, contributing to the pathogenesis of diseases such as cancer, liver disease, and neurodegeneration [1,2,6]. Therefore, understanding its structure, regulation, and function is crucial for developing targeted therapies and for interpreting disease-associated mutations.
• Regulates phosphatidylinositol phosphate levels, impacting membrane identity and trafficking.
• Involved in autophagy, a process critical for cellular homeostasis and survival [1,2].
• Linked to liver disease through its role in lipid droplet metabolism and autophagy [1,2].
• Implicated in cancer, where altered lipid signaling promotes tumor growth.
• Associated with Parkinson's disease via autophagy dysfunction.
• Serves as a potential biomarker for prostate cancer due to ACPP expression.
• Provides a target for therapeutic intervention in metabolic disorders.
• Its activity influences immune cell function through solute carrier transporters.
• Plays a role in fibroblast senescence, affecting tissue aging.
• Can be studied using CRISPR screens to identify novel regulators.
What Happens During phosphatidylinositol phosphate phosphatase complex?
Substrate Recognition and Binding
In simple terms: The complex first grabs onto its target lipid molecules.
The phosphatidylinositol phosphate phosphatase complex recognizes specific phosphatidylinositol phosphates (PIPs) within cellular membranes. This binding is mediated by structural motifs in the complex's subunits, such as the ACPP protein, which confer specificity for particular PIP species. The interaction is essential for positioning the catalytic site near the substrate's phosphate group.
Catalytic Dephosphorylation
In simple terms: The complex then removes a phosphate group from the lipid.
Once bound, the complex catalyzes the hydrolysis of the phosphate ester bond in PIPs, releasing inorganic phosphate and generating phosphatidylinositol (PI) or other dephosphorylated derivatives. This reaction is dependent on the presence of essential amino acid residues in the active site, which coordinate a water molecule for nucleophilic attack. The activity is a key mechanism for terminating PIP signaling.
Regulation by Cellular Signals
In simple terms: The complex's activity is turned on or off by other cellular signals.
The activity of the phosphatidylinositol phosphate phosphatase complex is regulated by various cellular cues, including growth factors, nutrients, and stress signals. For example, autophagy induction can modulate the complex's localization and activity, thereby influencing PIP turnover [1,2]. Additionally, post-translational modifications of the complex's subunits may affect its catalytic efficiency.
Integration with Autophagy and Membrane Trafficking
In simple terms: The complex helps control how cells recycle components and move materials.
By dephosphorylating PIPs, the complex influences the recruitment of effector proteins to membranes, thereby impacting autophagy and membrane trafficking pathways [1,3]. This integration ensures proper autophagosome formation and lysosomal degradation, processes that are vital for cellular quality control.
Key Genes Involved in GO:1904144 phosphatidylinositol phosphate phosphatase complex
The following genes and proteins are associated with the phosphatidylinositol phosphate phosphatase complex or its related pathways, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ACPP | Encodes prostatic acid phosphatase, a component with phosphatidylinositol phosphate phosphatase activity. | Studied in prostate cancer and lipid signaling. |
| MTOR | Regulates autophagy and lipid metabolism, indirectly affecting the complex. | Target for autophagy modulation in liver disease. |
| BECN1 | Core autophagy protein, interacts with phosphatidylinositol phosphates. | Knockout models to study autophagy crosstalk. |
| MAP1LC3B | Autophagosome marker, downstream of PIP signaling. | Used to monitor autophagy flux. |
| SQSTM1 | Autophagy receptor, links ubiquitinated cargo to autophagosomes. | Assessed in neurodegeneration models. |
| LAMP1 | Lysosomal marker, involved in autophagosome-lysosome fusion. | Imaging of lysosomal function. |
| ATP6V1A | V-ATPase subunit, acidifies lysosomes for degradation. | Knockout to study lysosomal dysfunction. |
| SLC7A11 | Cystine/glutamate transporter, influences ferroptosis and redox. | Point mutations to study ferroptosis. |
| GPX4 | Glutathione peroxidase, protects against lipid peroxidation. | Knockout models for ferroptosis. |
| SLC3A2 | Chaperone for SLC7A11, involved in amino acid transport. | Overexpression to study immune metabolism. |
| SLC1A5 | Glutamine transporter, supports metabolic reprogramming. | Knockdown in immune cells. |
| SLC2A1 | Glucose transporter, regulates energy supply. | Used in metabolic studies. |
| PRKN | Parkin, E3 ubiquitin ligase linked to mitophagy. | Knockout in Parkinson's models. |
| PINK1 | Kinase that activates Parkin in mitophagy. | Point mutations to study Parkinson's. |
| MTORC2 | Regulates autophagy and senescence. | Knockout to study fibroblast senescence. |
| RPTOR | Component of mTORC1, controls autophagy initiation. | Conditional knockout in liver. |
| TFEB | Transcription factor for autophagy and lysosomal genes. | Overexpression to boost autophagy. |
| NRF2 | Regulates antioxidant response, crosstalk with autophagy. | Knockout for oxidative stress studies. |
How Is phosphatidylinositol phosphate phosphatase complex Regulated?
The phosphatidylinositol phosphate phosphatase complex is regulated at multiple levels. Its activity can be modulated by upstream signaling pathways such as mTOR, which senses nutrient availability and controls autophagy. Additionally, the complex's localization and substrate accessibility are influenced by membrane composition and interacting proteins. Post-translational modifications, including phosphorylation, may alter its catalytic activity or stability. In the context of disease, dysregulation of these regulatory mechanisms can lead to aberrant PIP levels and contribute to pathology [1,2,6].
phosphatidylinositol phosphate phosphatase complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ACPP | Prostate cancer, lipid signaling | Knockout and overexpression in prostate cancer cell lines |
| MTOR | Liver disease, autophagy | Liver-specific knockout mice |
| PRKN | Parkinson's disease | Point mutation knock-in in neurons |
| GPX4 | Ferroptosis, cancer | Knockout in cancer cells |
| MTORC2 | Fibroblast senescence | Knockout in fibroblasts |
Cancer
Altered phosphatidylinositol phosphate signaling is a hallmark of many cancers. The phosphatidylinositol phosphate phosphatase complex, through its ability to dephosphorylate PIPs, can influence cell proliferation, survival, and migration [1,3]. In prostate cancer, ACPP expression is often dysregulated, and its phosphatase activity may impact tumor progression. Targeting this complex could therefore offer therapeutic benefits.
Liver Disease
The complex is implicated in liver disease through its role in autophagy and lipid droplet metabolism [1,2]. Autophagy dysfunction contributes to steatosis, fibrosis, and hepatocellular carcinoma. Modulating the complex's activity may help restore lipid homeostasis and improve liver function.
Neurodegeneration
In Parkinson's disease, impaired autophagy leads to the accumulation of toxic protein aggregates. The phosphatidylinositol phosphate phosphatase complex, by regulating PIP levels, affects autophagosome formation and clearance. Dysregulation of this complex may exacerbate neuronal vulnerability, making it a potential target for neuroprotective strategies.
From phosphatidylinositol phosphate phosphatase complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ACPP loss affect PIP levels? | ACPP knockout cell line |
| How do point mutations in ACPP alter phosphatase activity? | ACPP point mutation knock-in |
| Can overexpression of ACPP rescue lipid signaling defects? | ACPP overexpression |
| What is the interactome of the complex? | Tagged knock-in of ACPP for proteomics |
| Does the complex regulate autophagy flux? | CRISPR knockout of complex components followed by autophagy assays [1,2] |
| Is the complex involved in ferroptosis? | Knockout of GPX4 and SLC7A11 in combination |
How to Study the phosphatidylinositol phosphate phosphatase complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Malachite green assay | Phosphatase activity | Enzyme kinetics and inhibitor testing |
| Fluorescence microscopy | PIP localization and dynamics | Live-cell imaging of lipid signaling |
| Immunoprecipitation-MS | Protein-protein interactions | Identifying complex components |
| RNA-seq | Transcriptional changes | Knockout vs wild-type comparison |
| Lipidomics | Lipid species quantification | Assessing PIP turnover |
| CRISPR knockout screen | Gene essentiality and pathway discovery | Identifying regulators of autophagy |
| Autophagy flux assay | Autophagosome turnover | Monitoring autophagy activity [1,2] |
| Ferroptosis assay | Lipid peroxidation and cell death | Studying oxidative stress |
Biochemical Assays for Phosphatase Activity
To measure the catalytic activity of the phosphatidylinositol phosphate phosphatase complex, researchers can use malachite green or fluorescent-based assays with synthetic PIP substrates. These assays quantify the release of inorganic phosphate and are useful for characterizing enzyme kinetics and inhibitor screening.
Imaging of Lipid Dynamics
Fluorescently tagged PIP-binding domains (e.g., PH domains) can be used to visualize PIP distribution in live cells. Co-localization with the complex's subunits, such as ACPP, can reveal spatial regulation. Advanced microscopy techniques like TIRF and confocal microscopy enable real-time tracking of lipid turnover [1,3].
Omics Approaches
Proteomics can identify interacting partners of the complex through immunoprecipitation followed by mass spectrometry. Transcriptomics (RNA-seq) after CRISPR knockout can reveal downstream gene expression changes. Lipidomics can quantify PIP species and other lipids to assess the complex's impact on lipid metabolism [1,4].
CRISPR Screens
Genome-wide CRISPR knockout screens can identify genes that modulate the complex's activity or its downstream effects. For example, screens for regulators of autophagy or ferroptosis may uncover novel components or regulators of the phosphatidylinositol phosphate phosphatase complex [4,5].
How CRISPR Can Be Used to Study GO:1904144 phosphatidylinositol phosphate phosphatase complex
Knockout
CRISPR knockout of ACPP or other components of the phosphatidylinositol phosphate phosphatase complex can abolish its activity, allowing researchers to study loss-of-function phenotypes. For example, ACPP knockout cells can be used to assess changes in PIP levels, autophagy, and cell proliferation. Knockout models are also valuable for validating drug targets.
Point Mutation
Introducing point mutations in the catalytic domain of ACPP can help dissect the enzymatic mechanism and identify residues critical for phosphatase activity. Such models can distinguish between catalytic and non-catalytic functions of the protein. Point mutations found in patient samples can also be modeled to understand disease mechanisms.
Knock-in
Knock-in of tagged versions of ACPP (e.g., GFP or HA) enables visualization and purification of the complex. This approach facilitates interaction studies and live-cell imaging without altering endogenous regulation. Knock-in of disease-associated mutations can also create accurate disease models.
Overexpression
Overexpression of ACPP or other complex subunits can be used to study gain-of-function effects, such as enhanced phosphatase activity and its impact on downstream pathways. This is particularly useful for assessing whether increased complex activity can rescue phenotypes or promote disease [1,3].
How EDITGENE Supports phosphatidylinositol phosphate phosphatase complex Research
Researchers studying phosphatidylinositol phosphate phosphatase complex-related genes often need to determine whether a candidate gene is causally involved in lipid signaling, autophagy, or disease. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this discovery process, from gene knockout to precise point mutations and knock-in models.
Contact EDITGENE today to design your custom CRISPR model for phosphatidylinositol phosphate phosphatase complex research.
Frequently Asked Questions About phosphatidylinositol phosphate phosphatase complex
What is the phosphatidylinositol phosphate phosphatase complex?
It is a protein complex that removes phosphate groups from phosphatidylinositol phosphates, regulating lipid signaling and cellular processes like autophagy.
What genes are involved in the phosphatidylinositol phosphate phosphatase complex?
The ACPP gene encoding prostatic acid phosphatase is a key component, along with associated proteins involved in autophagy and membrane trafficking.
What is the function of GO:1904144?
GO:1904144 represents a cellular component with phosphatidylinositol phosphate phosphatase activity, which modulates PIP levels and downstream signaling.
How is the phosphatidylinositol phosphate phosphatase complex regulated?
Its activity is regulated by cellular signals such as mTOR, nutrient availability, and post-translational modifications.
What diseases are associated with the phosphatidylinositol phosphate phosphatase complex?
It has been implicated in cancer, liver disease, and Parkinson's disease through its role in lipid signaling and autophagy [1,2,6].
What research methods are used to study the phosphatidylinositol phosphate phosphatase complex?
Common methods include biochemical phosphatase assays, fluorescence microscopy, proteomics, and CRISPR screens [1,4].
Can CRISPR be used to study the phosphatidylinositol phosphate phosphatase complex?
Yes, CRISPR knockout, point mutation, and knock-in models are powerful tools to dissect the complex's function and regulation [1,4].
What is the synonym for GO:1904144?
The synonym is prostatic acid phosphatase complex.
How does the phosphatidylinositol phosphate phosphatase complex affect autophagy?
By dephosphorylating PIPs, it influences autophagosome formation and maturation, thereby impacting autophagic flux [1,2].
What cell models are available for studying the phosphatidylinositol phosphate phosphatase complex?
EDITGENE provides knockout, point mutation, knock-in, and overexpression models for genes like ACPP, MTOR, and BECN1 [1,2].
Conclusion
The phosphatidylinositol phosphate phosphatase complex (GO:1904144) is a critical regulator of phosphatidylinositol phosphate signaling, with far-reaching implications for autophagy, membrane trafficking, and human disease. Understanding its components, assembly, and regulation is essential for developing targeted therapies. Leveraging CRISPR-based models and EDITGENE's services can accelerate discoveries in this field, from basic mechanisms to translational applications.
References
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- 3. Devis-Jauregui L et al.. 2021. Autophagy in the physiological endometrium and cancer.. Autophagy 17(5):1077-1095 PMID: 32401642
- 4. Song X et al.. 2025. Cytosolic cytochrome c represses ferroptosis.. Cell Metab 37(6):1326-1343.e10 PMID: 40233758
- 5. Song W et al.. 2020. Solute carrier transporters: the metabolic gatekeepers of immune cells.. Acta Pharm Sin B 10(1):61-78 PMID: 31993307
- 6. Zhang K et al.. 2021. Targeting autophagy using small-molecule compounds to improve potential therapy of Parkinson's disease.. Acta Pharm Sin B 11(10):3015-3034 PMID: 34729301
- 8. Bernard M et al.. 2020. Autophagy drives fibroblast senescence through MTORC2 regulation.. Autophagy 16(11):2004-2016 PMID: 31931659
