GO:0015760 glucose-6-phosphate transport: Transport Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015760 glucose-6-phosphate transport describes the directed movement of glucose-6-phosphate (G6P) into, out of, or within a cell by transporters or pores.
• The human SLC37A family members G6PT (SLC37A4) and SLC37A2 are established G6P transporters, with recent cryo-EM structures revealing their transport and inhibition mechanisms.
• G6P transport is essential for metabolic homeostasis, including hepatic glucose production, neutrophil function, and pathogen adaptation.
• Bacterial G6P transport systems, such as the Escherichia coli UhpT transporter, operate via phosphate-linked antiport mechanisms.
• Defects in G6PT cause glycogen storage disease type Ib, a disorder characterized by hypoglycemia and neutropenia.
• Studying G6P transport requires integrated structural, biochemical, and CRISPR-based genetic approaches to dissect transporter function and disease relevance.
Description
Glucose-6-phosphate (G6P) is a central metabolite at the crossroads of glycolysis, gluconeogenesis, and the pentose phosphate pathway. The directed movement of G6P across cellular membranes is mediated by specific transport proteins and is annotated by the Gene Ontology term GO:0015760, glucose-6-phosphate transport. This process is critical for maintaining metabolic compartmentalization and enabling cells to respond to nutritional and hormonal cues. In humans, the glucose-6-phosphate transporter G6PT (encoded by SLC37A4) couples G6P transport to hydrolysis by glucose-6-phosphatase, a key step in blood glucose homeostasis. Recent structural studies have provided unprecedented insights into the molecular architecture and transport cycle of human G6P transporters, including G6PT and SLC37A2. These findings have broad implications for understanding metabolic disorders, host-pathogen interactions, and potential therapeutic targeting of G6P transport. Researchers studying G6P transport aim to elucidate its mechanistic details, regulatory networks, and roles in health and disease, often employing CRISPR gene editing to create precise cellular models.
glucose-6-phosphate transport At A Glance
| GO ID | GO:0015760 |
|---|---|
| GO term | glucose-6-phosphate transport |
| Ontology | biological_process |
| Synonym | none |
| Major function | Directed movement of glucose-6-phosphate across cellular membranes via transporters or pores |
| Key transporters | SLC37A4 (G6PT), SLC37A2, UhpT (bacterial) |
| Associated diseases | Glycogen storage disease type Ib, metabolic disorders |
| Research methods | Cryo-EM, transport assays, CRISPR knockout/knock-in models |
What Is GO:0015760?
According to the Gene Ontology, GO:0015760 glucose-6-phosphate transport is defined as the directed movement of glucose-6-phosphate into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Glucose-6-phosphate is a monophosphorylated derivative of glucose with the phosphate group attached to C-6. This biological process encompasses the translocation of G6P across biological membranes, which is essential for metabolic compartmentalization and signaling.
Why Is glucose-6-phosphate transport Important in Cell Biology?
Glucose-6-phosphate transport is fundamental to metabolic regulation because it controls the access of G6P to enzymes in different cellular compartments, thereby influencing glucose homeostasis, energy production, and biosynthetic pathways. In humans, the G6P transporter G6PT is essential for the final steps of gluconeogenesis and glycogenolysis, and its deficiency leads to glycogen storage disease type Ib, characterized by hypoglycemia and immune dysfunction. In pathogens such as Plasmodium falciparum and Staphylococcus aureus, G6P transport supports metabolic adaptation and virulence. Understanding the molecular mechanisms of G6P transport provides opportunities for therapeutic intervention in metabolic diseases and infections.
• Maintains blood glucose levels by enabling hepatic G6P transport for glucose release.
• Supports neutrophil function and immune defense; defects cause neutropenia in GSD Ib.
• Facilitates metabolic compartmentalization and substrate channeling in glycolysis and gluconeogenesis.
• Enables pathogen metabolic adaptation, as seen in Plasmodium falciparum and Staphylococcus aureus.
• Provides a target for drug development against metabolic disorders and infections.
• Essential for bacterial sugar phosphate uptake via UhpT and related antiporters.
• Involved in endoplasmic reticulum stress responses and calcium homeostasis.
• Serves as a model for studying solute carrier (SLC) transporter structure-function relationships.
What Happens During glucose-6-phosphate transport?
Substrate Recognition and Binding
In simple terms: The transporter first grabs the glucose-6-phosphate molecule.
G6P transporters such as G6PT and SLC37A2 recognize and bind glucose-6-phosphate with high specificity. Structural studies reveal that a conserved arginine residue coordinates the phosphate group of G6P, while hydrophobic residues form the binding pocket. In the bacterial UhpT transporter, substrate binding triggers conformational changes essential for transport.
Conformational Cycling and Translocation
In simple terms: The transporter changes shape to move G6P across the membrane.
Transport proceeds via an alternating access mechanism, where the transporter cycles between inward- and outward-facing conformations. Recent structural snapshots of the G6P/phosphate exchange cycle in SLC37A2 reveal distinct intermediate states that facilitate substrate translocation. This cycle is coupled to phosphate antiport in some transporters, ensuring directional transport.
Phosphate Exchange and Counter-Transport
In simple terms: G6P goes in while phosphate comes out, or vice versa.
Many G6P transporters function as antiporters, exchanging G6P for inorganic phosphate (Pi). For example, the E. coli UhpT protein mediates G6P:Pi exchange, a mechanism critical for bacterial sugar phosphate uptake. Similarly, human G6PT may operate via a phosphate-linked exchange mechanism, as suggested by structural and biochemical data.
Regulation and Inhibition
In simple terms: Other molecules can block or regulate the transporter.
G6P transport can be inhibited by specific compounds, such as the inhibitor identified in recent structural studies of G6PT. Additionally, transport activity is regulated by cellular metabolic status, including glucose availability and hormonal signals. In pathogens, G6P transport is modulated during infection and metabolic adaptation.
Key Genes Involved in GO:0015760 glucose-6-phosphate transport
The following genes encode proteins directly involved in glucose-6-phosphate transport or its regulation, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC37A4 (G6PT) | Endoplasmic reticulum G6P transporter; couples G6P transport to glucose-6-phosphatase | Mutations cause glycogen storage disease type Ib; target for structural and functional studies |
| SLC37A2 | G6P transporter with broad tissue expression; mediates G6P/phosphate exchange | Structural basis of transport recently elucidated; potential role in metabolic diseases |
| G6PC1 | Glucose-6-phosphatase catalytic subunit; hydrolyzes G6P to glucose | Works with G6PT in gluconeogenesis; mutations cause GSD Ia |
| SLC37A1 | Putative G6P transporter; less characterized | Potential redundant or tissue-specific functions |
| UhpT | Bacterial G6P:Pi antiporter | Model for studying sugar phosphate transport mechanisms |
| UhpC | Bacterial G6P sensor/regulator | Regulates UhpT expression in response to G6P |
| PfG6PT | Plasmodium falciparum G6P transporter | Essential for parasite metabolism; potential drug target |
| SLC2A1 (GLUT1) | Facilitates glucose transport, not G6P | Indirectly affects G6P levels; often studied alongside G6P transporters |
| SLC2A2 (GLUT2) | Bidirectional glucose transporter | Influences hepatic G6P pools and transport |
| GYS1 | Glycogen synthase | Utilizes G6P-derived UDP-glucose; links transport to storage |
| PYGL | Glycogen phosphorylase | Produces G6P from glycogen; substrate for transport |
| G6PD | Glucose-6-phosphate dehydrogenase | Competes for G6P; affects transport demand |
| PGM1 | Phosphoglucomutase | Interconverts G6P and G1P; impacts transport flux |
| HK1 | Hexokinase 1 | Phosphorylates glucose to G6P; upstream of transport |
| GCK | Glucokinase | Liver-specific glucose phosphorylation; regulates G6P supply |
| SLC37A3 | Putative G6P transporter | Poorly characterized; potential role in transport |
| SLC37A4 variants | Mutant forms of G6PT | Studied for disease mechanisms and transport defects |
| SLC37A2 variants | Mutant forms of SLC37A2 | Used to dissect structure-function relationships |
How Is glucose-6-phosphate transport Regulated?
Glucose-6-phosphate transport is regulated at multiple levels. Transcriptional regulation of SLC37A4 and SLC37A2 responds to metabolic hormones such as insulin and glucagon. Post-translational modifications, including phosphorylation, may modulate transporter activity. In bacteria, the UhpT transporter is induced by extracellular G6P via the UhpC sensor. Additionally, substrate availability and cellular energy status influence transport rates, as seen in Plasmodium falciparum during infection.
glucose-6-phosphate transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC37A4 | Glycogen storage disease type Ib | Knockout hepatocyte cell lines; patient-derived iPSCs |
| SLC37A2 | Metabolic disorders; G6P transport deficiency | Knockout HEK293 cells; overexpression models |
| UhpT | Bacterial sugar phosphate uptake; virulence | E. coli knockout strains; transport assays |
| PfG6PT | Malaria parasite metabolism | Plasmodium knockout lines; conditional knockdown |
| G6PC1 | Glycogen storage disease type Ia | Knockout mouse models; hepatocyte cell lines |
Glycogen Storage Disease Type Ib
Mutations in SLC37A4, encoding G6PT, cause glycogen storage disease type Ib (GSD Ib), an autosomal recessive disorder characterized by hypoglycemia, hepatomegaly, and neutropenia. The transport defect impairs glucose-6-phosphatase activity, leading to accumulation of G6P and glycogen in the liver and kidneys. Structural studies of G6PT mutants provide insights into the molecular basis of GSD Ib.
Metabolic Disorders and Diabetes
Altered G6P transport contributes to metabolic dysregulation in diabetes and obesity. In Staphylococcus aureus, G6P transport supports metabolic adaptation in diabetic hosts, highlighting a link between host metabolism and pathogen fitness. In humans, dysregulated hepatic G6P transport affects blood glucose control and insulin sensitivity.
Infectious Diseases
Plasmodium falciparum relies on G6P transport for its metabolic needs during infection, making it a potential antimalarial target. Similarly, bacterial G6P transporters like UhpT are essential for sugar phosphate uptake and virulence in pathogens such as Escherichia coli.
From glucose-6-phosphate transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC37A4 impair G6P transport? | CRISPR knockout in HepG2 or HEK293 cells |
| How do point mutations in SLC37A4 affect transport activity? | Point mutation knock-in via CRISPR in cell lines |
| Can wild-type SLC37A2 rescue transport in knockout cells? | Knock-in or overexpression of SLC37A2 |
| What is the subcellular localization of G6PT? | Tagged knock-in (e.g., GFP) in hepatocytes |
| Does overexpression of UhpT increase G6P uptake in bacteria? | Overexpression in E. coli |
| Can CRISPR library screening identify novel G6P transport regulators? | Genome-wide CRISPR knockout library in transport-deficient cells |
How to Study the glucose-6-phosphate transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Cryo-EM | 3D structure of transporter proteins | Determining G6PT and SLC37A2 architecture |
| Radioactive transport assay | G6P uptake or efflux rates | Characterizing transporter kinetics |
| CRISPR knockout | Loss-of-function effects on transport | Validating gene function in cells |
| CRISPR knock-in | Expression of mutant or tagged transporters | Studying disease mutations or localization |
| Metabolomics | Intracellular G6P and metabolite levels | Assessing metabolic impact of transport |
| Western blot | Protein expression levels | Confirming knockout or overexpression |
| Immunofluorescence | Subcellular localization | Determining organelle targeting |
| CRISPR library screening | Identification of genes affecting transport | Discovery of novel regulators |
Structural Biology (Cryo-EM and X-ray Crystallography)
High-resolution structures of G6PT and SLC37A2 have been determined using cryo-electron microscopy, revealing substrate binding sites and conformational changes during transport. These methods are essential for understanding the molecular mechanism and for structure-based drug design.
Transport Assays
Radiolabeled or fluorescent G6P uptake assays in proteoliposomes or intact cells measure transport kinetics and specificity. Such assays have been used to characterize UhpT and human G6PT.
CRISPR-Cas9 Gene Editing
CRISPR knockout, knock-in, and point mutation models enable functional dissection of G6P transporters in relevant cell types. These models help link specific mutations to transport defects and disease phenotypes.
Metabolomics and Flux Analysis
Mass spectrometry-based metabolomics quantifies G6P and related metabolites in cells with altered transporter expression, providing insights into metabolic rewiring.
How CRISPR Can Be Used to Study GO:0015760 glucose-6-phosphate transport
Knockout
CRISPR knockout of SLC37A4 or SLC37A2 in cell lines such as HepG2 or HEK293 abolishes G6P transport, enabling studies of metabolic consequences and compensatory pathways. Knockout models are also used to validate transporter specificity and to create disease-relevant cellular platforms.
Point Mutation
Introducing disease-associated point mutations (e.g., in SLC37A4) via CRISPR base editing or homology-directed repair allows precise assessment of how single amino acid changes affect G6P transport activity and protein stability. Such models are invaluable for genotype-phenotype correlations.
Knock-in
Knock-in of tagged versions of G6PT (e.g., GFP or HA) facilitates live-cell imaging and proteomic studies. Knock-in of wild-type or mutant SLC37A2 can rescue transport in knockout backgrounds, providing a system to test structure-function hypotheses.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of G6P transporters increases transport capacity, useful for biochemical assays and for studying downstream metabolic effects. Overexpression in bacterial systems (e.g., UhpT in E. coli) is a classic approach for transport characterization.
How EDITGENE Supports glucose-6-phosphate transport Research
Researchers studying glucose-6-phosphate transport-related genes often need to determine whether a candidate gene is causally involved in transport, how specific mutations affect function, and what metabolic pathways are rewired. EDITGENE provides end-to-end CRISPR solutions to address these questions with precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for glucose-6-phosphate transport research.
Frequently Asked Questions About glucose-6-phosphate transport
What is glucose-6-phosphate transport?
Glucose-6-phosphate transport (GO:0015760) is the directed movement of glucose-6-phosphate across cellular membranes by transporters or pores, essential for metabolic compartmentalization.
What genes are involved in glucose-6-phosphate transport?
Key genes include SLC37A4 (G6PT), SLC37A2, and in bacteria UhpT. Other related genes include G6PC1 and SLC37A1.
What diseases are associated with defects in glucose-6-phosphate transport?
Mutations in SLC37A4 cause glycogen storage disease type Ib, characterized by hypoglycemia and neutropenia. Altered transport is also linked to diabetes and infections.
How is glucose-6-phosphate transported across the endoplasmic reticulum?
G6PT (SLC37A4) transports G6P into the ER, where it is hydrolyzed by glucose-6-phosphatase to release glucose.
What is the mechanism of G6P transport by SLC37A2?
SLC37A2 mediates G6P/phosphate exchange via an alternating access mechanism, as revealed by recent structural snapshots.
Can CRISPR be used to study glucose-6-phosphate transport?
Yes, CRISPR knockout, knock-in, and point mutation models are powerful tools to dissect transporter function and disease mechanisms.
What are the research methods for studying G6P transport?
Common methods include cryo-EM, radiolabeled transport assays, metabolomics, and CRISPR-based gene editing.
Why is glucose-6-phosphate transport important for metabolism?
It controls substrate access to enzymes in different compartments, influencing glucose homeostasis, energy production, and biosynthetic pathways.
How does bacterial G6P transport work?
Bacterial UhpT functions as a G6P:Pi antiporter, coupling G6P uptake to phosphate efflux.
What cell models are available for G6P transport research?
EDITGENE provides knockout, point mutation, knock-in, and overexpression cell models for SLC37A4, SLC37A2, and related genes, along with CRISPR library screening and bioinformatics services.
Conclusion
Glucose-6-phosphate transport (GO:0015760) is a fundamental biological process that ensures the proper distribution of a key metabolite across cellular membranes. Advances in structural biology and CRISPR gene editing have illuminated the molecular mechanisms of G6P transporters and their roles in health and disease. Understanding these processes opens new avenues for therapeutic intervention in metabolic disorders and infections. EDITGENE offers comprehensive CRISPR solutions to accelerate research on G6P transport and related pathways.
References
- 1. Xia Z et al.. 2025. Structural basis for transport and inhibition of the human glucose-6-phosphate transporter G6PT.. Nat Commun 16(1):9420 PMID: 41136424
- 2. Lai Q et al.. 2026. Structural basis of glucose-6-phosphate transport by human SLC37A2.. Nat Struct Mol Biol 33(1):112-122 PMID: 41225050
- 3. Preuss J et al.. 2012. Glucose-6-phosphate metabolism in Plasmodium falciparum.. IUBMB Life 64(7):603-11 PMID: 22639416
- 4. Gerin I et al.. 2002. Evidence for glucose-6-phosphate transport in rat liver microsomes.. FEBS Lett 517(1-3):257-60 PMID: 12062448
- 5. Agius L et al.. 2002. Multiple glucose 6-phosphate pools or channelling of flux in diverse pathways?. Biochem Soc Trans 30(2):38-43 PMID: 12023820
- 6. Qi LK et al.. 2026. Structural snapshots of the glucose-6-phosphate/phosphate exchange cycle.. PLoS Biol 24(7):e3003913 PMID: 42525624
- 7. Seo KS et al.. 2021. Role of Glucose-6-Phosphate in Metabolic Adaptation of Staphylococcus aureus in Diabetes.. Microbiol Spectr 9(2):e0085721 PMID: 34549996
- 8. Sonna LA et al.. 1988. The mechanism of glucose 6-phosphate transport by Escherichia coli.. J Biol Chem 263(14):6625-30 PMID: 3283129
