GO:0008521 acetyl-CoA transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008521 (acetyl-CoA transmembrane transporter activity) is a molecular function that enables the transfer of acetyl-CoA across a membrane.
• Acetyl-CoA is a central metabolite derived from glycolysis, fatty acid oxidation and amino-acid catabolism, and it feeds the TCA cycle and lipid/terpenoid biosynthesis.
• The best-characterized protein linked to this activity is SLC33A1, an acetyl-CoA transporter in the endoplasmic reticulum/Golgi that supplies acetyl-CoA for protein acetylation and sialic acid O-acetylation.
• Loss of SLC33A1-dependent acetyl-CoA transport causes CASD1-dependent defects in Golgi sialic acid O-acetylation, linking this transport activity to human disease.
• Membrane transport of acetyl-CoA is essential for compartmentalized metabolism, including lipid droplet dynamics and liver disease.
• Studying GO:0008521 requires combining transport assays, organelle proteomics, CRISPR knockout/knock-in models and metabolic flux analysis [3,6].
Description
GO:0008521, acetyl-CoA transmembrane transporter activity, is a molecular function that enables the transfer of acetyl-CoA from one side of a membrane to the other. Acetyl-CoA is a derivative of coenzyme A in which the sulfhydryl group is acetylated; it is a metabolite derived from several pathways, including glycolysis, fatty acid oxidation and amino-acid catabolism, and it is further metabolized by the tricarboxylic acid cycle. Because acetyl-CoA is a key intermediate in lipid and terpenoid biosynthesis, its transport across membranes is critical for compartmentalized metabolism. Researchers study this activity to understand how cells distribute acetyl-CoA between organelles such as the endoplasmic reticulum, Golgi, mitochondria and cytosol [3,6]. The term is also relevant to human disease: mutations affecting acetyl-CoA transport can disrupt Golgi sialic acid O-acetylation and cause CASD1-related pathology. In addition, acetyl-CoA transport intersects with autophagy, lipid droplets and liver disease, making it a target for metabolic and cancer research. This article summarizes the authoritative GO definition, the known genes and proteins, disease links, and experimental methods for studying GO:0008521.
acetyl-CoA transmembrane transporter activity At A Glance
| GO ID | GO:0008521 |
|---|---|
| GO term | acetyl-CoA transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | acetyl-CoA transporter activity |
| Major function | Transfer of acetyl-CoA from one side of a membrane to the other |
| Substrate | Acetyl-CoA, a derivative of coenzyme A with an acetylated sulfhydryl group |
| Metabolic context | Derived from glycolysis, fatty acid oxidation and amino-acid catabolism; feeds the TCA cycle and lipid/terpenoid biosynthesis |
| Example protein | SLC33A1, an acetyl-CoA transporter linked to Golgi sialic acid O-acetylation |
| Disease relevance | Defects in acetyl-CoA transport are linked to CASD1-related pathology and metabolic liver disease |
What Is GO:0008521?
In simple terms, GO:0008521 describes the ability of a protein to move acetyl-CoA across a membrane. The official definition states: Enables the transfer of acetyl-CoA from one side of a membrane to the other. Acetyl-CoA is a derivative of coenzyme A in which the sulfhydryl group is acetylated; it is a metabolite derived from several pathways (e.g. glycolysis, fatty acid oxidation, amino-acid catabolism) and is further metabolized by the tricarboxylic acid cycle. It is a key intermediate in lipid and terpenoid biosynthesis. This activity is annotated as a molecular function and is distinct from acetyl-CoA binding or acetyltransferase activity. The synonym acetyl-CoA transporter activity is used interchangeably in the literature.
Why Is acetyl-CoA transmembrane transporter activity Important in Cell Biology?
GO:0008521 is important because acetyl-CoA is a central metabolic intermediate that must be distributed across membrane-bound compartments to support diverse biosynthetic and regulatory processes. Without transmembrane transport, acetyl-CoA generated in one organelle cannot be used for lipid synthesis, protein acetylation or sialic acid modification in another compartment [3,6]. This activity therefore influences membrane composition, protein glycosylation and cellular responses to metabolic stress [3,7]. It also connects to major human diseases, including liver disease and developmental disorders caused by defective Golgi acetylation [1,3].
• Enables compartmentalized acetyl-CoA metabolism, which is essential for lipid and terpenoid biosynthesis.
• Supports protein acetylation and sialic acid O-acetylation in the secretory pathway.
• Links glycolysis, fatty acid oxidation and amino-acid catabolism to the TCA cycle.
• Contributes to lipid droplet dynamics and autophagy regulation in liver disease.
• Is required for normal Golgi function and glycosylation-dependent cell surface regulation.
• Provides a target for studying metabolic reprogramming in cancer and metabolic disorders.
• Helps explain the pathophysiology of CASD1-related disease and other transportopathies.
• Is relevant to drug discovery because transport inhibitors can modulate acetyl-CoA availability.
• Connects to carnitine and fatty acid oxidation pathways that influence acetyl-CoA pools.
• Is a focus of organelle biology, including endoplasmic reticulum and Golgi transport.
What Happens During acetyl-CoA transmembrane transporter activity?
Substrate recognition and binding
In simple terms: The transporter first grabs acetyl-CoA on one side of the membrane.
Acetyl-CoA transmembrane transporter activity begins with recognition of acetyl-CoA, a derivative of coenzyme A in which the sulfhydryl group is acetylated. The transporter must distinguish acetyl-CoA from related metabolites such as free coenzyme A and other acyl-CoA species. This step is essential for ensuring that the correct metabolite is moved across the membrane.
Translocation across the lipid bilayer
In simple terms: The transporter then moves acetyl-CoA through the membrane to the other side.
After binding, the transporter facilitates the transfer of acetyl-CoA from one side of a membrane to the other. This translocation step is the defining catalytic event of GO:0008521. It allows acetyl-CoA generated in one compartment to be used in another, supporting metabolic compartmentalization.
Release and metabolic utilization
In simple terms: Once across, acetyl-CoA is released to feed biosynthetic pathways.
Following translocation, acetyl-CoA is released into the recipient compartment, where it can be used for lipid and terpenoid biosynthesis or for the TCA cycle. In the Golgi, transported acetyl-CoA can serve as a substrate for sialic acid O-acetylation, a modification important for glycoprotein function.
Coupling to downstream acetylation reactions
In simple terms: The transported acetyl-CoA can be used to add acetyl groups to other molecules.
Acetyl-CoA delivered by this transport activity can be consumed by acetyltransferases, including those involved in sialic acid O-acetylation. This coupling links transport activity to post-translational and glycan modifications that affect cell surface interactions and signaling.
Key Genes Involved in GO:0008521 acetyl-CoA transmembrane transporter activity
The following genes and proteins are experimentally linked to acetyl-CoA transmembrane transporter activity or its downstream metabolic context.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC33A1 | Acetyl-CoA transporter in the endoplasmic reticulum/Golgi | Directly linked to GO:0008521 and CASD1-dependent sialic acid O-acetylation |
| CASD1 | Sialic acid O-acetyltransferase that uses acetyl-CoA | Downstream effector of SLC33A1-dependent transport |
| ACAT1 | Mitochondrial acetoacetyl-CoA thiolase | Influences acetyl-CoA pools and transport demand |
| ACLY | ATP-citrate lyase producing cytosolic acetyl-CoA | Source of acetyl-CoA for transport-dependent pathways |
| ACSS2 | Acetyl-CoA synthetase 2 | Generates acetyl-CoA from acetate for compartmentalized use |
| CPT1A | Carnitine palmitoyltransferase 1A | Links fatty acid oxidation to acetyl-CoA production |
| CPT2 | Carnitine palmitoyltransferase 2 | Mitochondrial fatty acid oxidation and acetyl-CoA supply |
| SLC25A1 | Mitochondrial citrate carrier | Indirectly affects acetyl-CoA transport and metabolism |
| SLC25A20 | Carnitine-acylcarnitine translocase | Supports fatty acid oxidation and acetyl-CoA generation |
| HADHA | Mitochondrial trifunctional protein subunit | Fatty acid oxidation enzyme affecting acetyl-CoA levels |
| HADHB | Mitochondrial trifunctional protein subunit | Fatty acid oxidation enzyme affecting acetyl-CoA levels |
| PDHA1 | Pyruvate dehydrogenase E1 subunit | Produces acetyl-CoA from pyruvate |
| PDHB | Pyruvate dehydrogenase E1 beta subunit | Produces acetyl-CoA from pyruvate |
| DLAT | Dihydrolipoamide acetyltransferase | Pyruvate dehydrogenase complex component |
| DLD | Dihydrolipoamide dehydrogenase | Pyruvate dehydrogenase complex component |
| CS | Citrate synthase | Consumes acetyl-CoA in the TCA cycle |
| ACACA | Acetyl-CoA carboxylase alpha | Uses acetyl-CoA for fatty acid synthesis |
| HMGCR | HMG-CoA reductase | Uses acetyl-CoA for terpenoid biosynthesis |
How Is acetyl-CoA transmembrane transporter activity Regulated?
The activity of acetyl-CoA transmembrane transporters is regulated at multiple levels. Substrate availability of acetyl-CoA, which is derived from glycolysis, fatty acid oxidation and amino-acid catabolism, directly influences transport flux. In the secretory pathway, SLC33A1-dependent transport is coupled to CASD1 catalysis, and disruption of this coupling alters Golgi sialic acid O-acetylation. Glycosylation-dependent cell surface regulation can also feed back on transport and acetylation processes. In addition, metabolic stress and autophagy modulate lipid droplet dynamics and liver disease progression, indirectly affecting acetyl-CoA transport requirements. Carnitine availability, which is essential for fatty acid oxidation, can also influence acetyl-CoA pools and transport demand.
acetyl-CoA transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC33A1 | CASD1-related sialic acid O-acetylation defect | Knockout and knock-in cell models with CASD1 readout |
| CASD1 | Golgi sialic acid O-acetylation and glycosylation disorders | Point-mutation models to test catalytic residues |
| ACLY | Cancer metabolism and lipid synthesis | Overexpression and knockout in cancer cell lines |
| CPT1A | Fatty acid oxidation disorders and liver disease | Knockout hepatocyte models |
| HMGCR | Terpenoid biosynthesis and metabolic disease | Knock-in reporter models for acetyl-CoA flux |
CASD1-related disease and Golgi acetylation defects
Loss of SLC33A1-dependent acetyl-CoA transport impairs CASD1-catalyzed sialic acid O-acetylation, linking GO:0008521 to human disease. This defect affects glycoprotein function and cell surface interactions, which are critical for normal development and physiology.
Liver disease and lipid droplet dysfunction
Acetyl-CoA transport intersects with autophagy and lipid droplet biology, and dysregulation of these processes contributes to liver disease. Impaired acetyl-CoA distribution can alter lipid storage and turnover, promoting steatosis and liver injury.
Metabolic disorders and fatty acid oxidation defects
Defects in fatty acid oxidation, which supplies acetyl-CoA, can indirectly affect acetyl-CoA transport and compartmentalized metabolism. Carnitine deficiency and related disorders highlight the importance of acetyl-CoA availability for normal physiology.
Cancer metabolism and biosynthetic reprogramming
Cancer cells often reprogram acetyl-CoA metabolism to support lipid synthesis and protein acetylation. Transport of acetyl-CoA across membranes may therefore contribute to tumor growth and survival, making it a potential therapeutic target.
From acetyl-CoA transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC33A1 reduce Golgi acetyl-CoA transport? | SLC33A1 knockout cell line with CASD1 activity assay |
| Which residues are required for acetyl-CoA binding? | Point-mutation knock-in of SLC33A1 |
| Can tagged SLC33A1 track organelle localization? | Tagged knock-in with fluorescent or affinity tag |
| Does overexpression of ACLY increase acetyl-CoA transport demand? | Overexpression cell model |
| Is acetyl-CoA transport required for lipid droplet formation? | Knockout plus lipid droplet imaging |
| Does CASD1 mutation affect sialic acid O-acetylation? | Point-mutation knock-in of CASD1 |
How to Study the acetyl-CoA transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled acetyl-CoA uptake | Transport rate across membranes | Validation of GO:0008521 activity |
| Subcellular fractionation + MS | Organelle protein composition | Identifying candidate transporters |
| CRISPR knockout screen | Genes required for transport | Discovery of new regulators |
| CRISPR knock-in reporter | Protein localization and dynamics | Tracking SLC33A1 in live cells |
| Isotope tracing | Metabolic flux from acetyl-CoA | Lipid and TCA cycle analysis |
| Lipidomics | Lipid species and abundance | Assessing lipid droplet changes |
| Glycan analysis | Sialic acid O-acetylation | Measuring CASD1-dependent modifications |
| RNA-seq | Transcriptional responses | Pathway analysis after transport perturbation |
Transport assays with radiolabeled or fluorescent acetyl-CoA
Direct measurement of acetyl-CoA transmembrane transporter activity can be performed using radiolabeled or fluorescent acetyl-CoA in membrane vesicle or permeabilized cell systems. These assays quantify substrate uptake across membranes and are essential for validating GO:0008521 annotations.
Organelle proteomics and subcellular fractionation
Subcellular fractionation followed by mass spectrometry can identify transporters enriched in specific organelles, such as the endoplasmic reticulum and Golgi. This approach helps link candidate proteins to acetyl-CoA transport activity.
CRISPR-based genetic screens
CRISPR knockout and knock-in screens can identify genes required for acetyl-CoA transport and downstream acetylation. Such screens are powerful for discovering new regulators of GO:0008521.
Metabolic flux analysis and lipidomics
Isotope tracing and lipidomics measure how acetyl-CoA is distributed into lipid and terpenoid pathways. These methods reveal the metabolic consequences of altered transport activity.
How CRISPR Can Be Used to Study GO:0008521 acetyl-CoA transmembrane transporter activity
Knockout
CRISPR knockout of SLC33A1 or related genes can abolish acetyl-CoA transmembrane transporter activity, allowing researchers to test its requirement for Golgi acetylation and lipid metabolism. Knockout models are also useful for identifying compensatory pathways.
Point Mutation
Point mutations in candidate transporter genes can dissect substrate binding and catalytic residues. For example, mutating residues in SLC33A1 can reveal which domains are essential for acetyl-CoA transport.
Knock-in
Knock-in of tagged or reporter versions of transporters enables real-time tracking of localization and dynamics. This approach is valuable for studying organelle-specific transport of acetyl-CoA.
Overexpression
Overexpression of acetyl-CoA transporters or upstream enzymes such as ACLY can increase transport flux and reveal downstream metabolic effects. Overexpression models are useful for testing whether increased transport promotes lipid synthesis or acetylation.
How EDITGENE Supports acetyl-CoA transmembrane transporter activity Research
Researchers studying acetyl-CoA transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in transport, acetylation or metabolic disease. EDITGENE provides CRISPR-based cell models and screening services to accelerate this work.
Contact EDITGENE today to design your custom CRISPR model for acetyl-CoA transmembrane transporter activity research.
Frequently Asked Questions About acetyl-CoA transmembrane transporter activity
What is acetyl-CoA transmembrane transporter activity?
It is a molecular function (GO:0008521) that enables the transfer of acetyl-CoA from one side of a membrane to the other.
What genes are involved in acetyl-CoA transmembrane transporter activity?
SLC33A1 is the best-characterized gene directly linked to this activity, with CASD1 acting downstream in Golgi sialic acid O-acetylation.
What is the GO ID for acetyl-CoA transmembrane transporter activity?
The GO ID is GO:0008521.
Which diseases are linked to acetyl-CoA transport defects?
Defects are linked to CASD1-related Golgi acetylation disorders, liver disease and metabolic dysfunction [1,3].
How can I study acetyl-CoA transmembrane transporter activity?
Researchers use transport assays, organelle proteomics, CRISPR knockout/knock-in models and metabolic flux analysis [3,6].
Is SLC33A1 an acetyl-CoA transporter?
Yes, SLC33A1 is an acetyl-CoA transporter in the endoplasmic reticulum/Golgi and is linked to CASD1-dependent sialic acid O-acetylation.
What is the role of acetyl-CoA in the cell?
Acetyl-CoA is a central metabolite derived from glycolysis, fatty acid oxidation and amino-acid catabolism, and it feeds the TCA cycle and lipid/terpenoid biosynthesis.
Can CRISPR be used to study acetyl-CoA transport?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models are widely used to dissect transporter function.
What are the symptoms of defective acetyl-CoA transport?
Defective transport can impair Golgi sialic acid O-acetylation and contribute to liver disease and metabolic disorders [1,3].
Where is acetyl-CoA transmembrane transporter activity located in the cell?
It occurs in membranes of organelles such as the endoplasmic reticulum and Golgi, where acetyl-CoA is needed for acetylation and biosynthesis [3,6].
Conclusion
GO:0008521, acetyl-CoA transmembrane transporter activity, is a critical molecular function that distributes acetyl-CoA across cellular membranes to support lipid synthesis, protein acetylation and energy metabolism [1,6]. The best-characterized example, SLC33A1, links this activity to Golgi sialic acid O-acetylation and human disease. Understanding its regulation and disease relevance requires integrated approaches, including CRISPR models, transport assays and metabolic profiling [3,6]. Future research will likely uncover additional transporters and therapeutic opportunities targeting acetyl-CoA compartmentalization.
References
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- 2. Selinger M et al.. 2022. Integrative RNA profiling of TBEV-infected neurons and astrocytes reveals potential pathogenic effectors.. Comput Struct Biotechnol J 20:2759-2777 PMID: 35685361
- 3. Albers M et al.. 2026. Interplay of SLC33A1-dependent and -independent Golgi sialic acid O-acetylation in CASD1 catalysis.. Nat Commun 17(1) PMID: 41917001
- 5. Adeva-Andany MM et al.. 2017. Significance of l-carnitine for human health.. IUBMB Life 69(8):578-594 PMID: 28653367
- 6. Csala M et al.. 2007. Transport and transporters in the endoplasmic reticulum.. Biochim Biophys Acta 1768(6):1325-41 PMID: 17466261
- 7. Dennis JW et al.. 2009. Adaptive regulation at the cell surface by N-glycosylation.. Traffic 10(11):1569-78 PMID: 19761541
