GO:0070777 D-aspartate transmembrane transport: Transport Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070777 describes the biological process in which D-aspartate, the D-enantiomer of the aspartate anion, is moved across a lipid bilayer from one side of a membrane to the other by a transporter or pore.
• D-aspartate is a signaling-relevant amino acid in the mammalian brain, and its transmembrane movement is functionally coupled to glutamatergic neurotransmission and NMDA receptor biology.
• NMDA receptors (GRIN1, GRIN2A, GRIN2B, GRIN2C, GRIN2D, GRIN3A, GRIN3B) and related ionotropic glutamate receptors are central to the transport and signaling context of acidic amino acids such as D-aspartate.
• GRIN2A and GRIN2B variants cause severe neurodevelopmental disorders, and their functional consequences can be predicted from genotype, making these genes high-value experimental targets.
• D-aspartate transport intersects with neurodegeneration, synaptic signaling, and excitotoxicity pathways, and is therefore relevant to neurological disease modeling.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of D-aspartate transport-related genes in neuronal and non-neuronal systems.
Description
GO:0070777, D-aspartate transmembrane transport, is a Gene Ontology biological process term that defines the movement of D-aspartate, the D-enantiomer of the aspartate anion, across a lipid bilayer from one side of a membrane to the other by means of a transporter or pore. D-aspartate is an acidic amino acid that is structurally related to L-glutamate and L-aspartate, and its transmembrane distribution is relevant to amino acid homeostasis and to signaling in the nervous system. Because D-aspartate can influence glutamatergic signaling and NMDA receptor function, understanding how it crosses membranes is important for neurobiology and for interpreting disease-associated variants in glutamate receptor genes. In the mammalian brain, D-aspartate is present in specific regions and is linked to NMDA receptor-mediated neurotransmission, where receptor subunits such as GRIN1, GRIN2A, GRIN2B, GRIN2C, GRIN2D, GRIN3A, and GRIN3B determine ion conductance, ligand binding, and downstream signaling. NMDA receptors are calcium-permeable ion channels whose activity is shaped by subunit composition, allosteric modulators, and neurosteroid binding, and these properties influence how acidic amino acids and related ligands act at synapses. Consequently, D-aspartate transmembrane transport is not an isolated transport event but part of a broader system of amino acid handling and receptor-mediated signaling. For researchers, GO:0070777 provides a precise annotation target for studies of amino acid transporters, membrane permeability, and neuronal signaling. It is also a useful framework for designing CRISPR-based experiments that test whether candidate genes causally affect D-aspartate movement and downstream phenotypes. This article summarizes the definition, mechanisms, key genes, disease links, and experimental methods relevant to D-aspartate transmembrane transport.
D-aspartate transmembrane transport At A Glance
| GO ID | GO:0070777 |
|---|---|
| GO term | D-aspartate transmembrane transport |
| Ontology | biological_process |
| Synonym | (none) |
| Major function | Movement of D-aspartate across a lipid bilayer from one side of a membrane to the other by a transporter or pore |
| Substrate | D-aspartate, the D-enantiomer of the anion of (2R)-2-aminobutanedioic acid |
| Directionality | Transmembrane, from one side of a membrane to the other |
| Mechanism class | Transporter- or pore-mediated membrane transport |
| Related signaling context | Glutamatergic neurotransmission and NMDA receptor biology |
What Is GO:0070777?
D-aspartate transmembrane transport (GO:0070777) is the process by which D-aspartate, the D-enantiomer of the anion of (2R)-2-aminobutanedioic acid, is transported across a lipid bilayer from one side of a membrane to the other by means of some agent such as a transporter or pore. In other words, it is the directed membrane crossing of D-aspartate, mediated by a protein machinery component rather than by simple diffusion alone.
Why Is D-aspartate transmembrane transport Important in Cell Biology?
D-aspartate transmembrane transport is important because D-aspartate is a signaling-relevant acidic amino acid in the nervous system, and its membrane movement influences glutamatergic signaling and NMDA receptor function. NMDA receptors are central to synaptic plasticity, excitability, and neurodevelopment, and their subunit composition and regulation determine how acidic amino acids and related ligands affect neuronal circuits. Disease-associated variants in GRIN2A and GRIN2B alter receptor function and cause neurodevelopmental phenotypes, making transport and receptor biology a high-priority area for mechanistic and translational research. In addition, D-aspartate transport intersects with neurodegeneration and excitotoxicity pathways, where dysregulated amino acid handling can contribute to neuronal injury.
• D-aspartate is an acidic amino acid whose transmembrane distribution is relevant to glutamatergic signaling and NMDA receptor function.
• NMDA receptor subunits such as GRIN1, GRIN2A, GRIN2B, GRIN2C, GRIN2D, GRIN3A, and GRIN3B shape ion conductance and signaling, providing a functional context for D-aspartate transport.
• GRIN2A-related disorders show genotype-phenotype correlations, making transport and receptor genes attractive for functional genomics.
• GRIN2B encephalopathy is associated with variant clustering and functional consequences that can inform treatment strategies.
• Calcium-permeable AMPA receptors and their modulation by memantine illustrate how acidic amino acid signaling can be pharmacologically targeted.
• Synaptotagmins and synaptic vesicle machinery are linked to neurodegeneration, connecting transport and synaptic dysfunction.
• Tripartite signaling by NMDA receptors involves neurons and glia, expanding the cellular contexts in which D-aspartate transport may matter.
• GluD1 functions as a signal transduction device disguised as an ionotropic receptor, highlighting non-canonical glutamate receptor signaling.
• CRISPR models allow causal testing of transport-related genes in neuronal and non-neuronal systems.
• D-aspartate transport is a precise GO annotation target for functional annotation and pathway analysis.
What Happens During D-aspartate transmembrane transport?
Substrate recognition and membrane engagement
In simple terms: First, the cell recognizes D-aspartate and brings it to the membrane.
D-aspartate transmembrane transport begins with the presence of D-aspartate, the D-enantiomer of the aspartate anion, at one side of a lipid bilayer. The process requires an agent such as a transporter or pore that can engage the substrate and facilitate its movement across the membrane. In the nervous system, acidic amino acids such as D-aspartate are functionally linked to glutamatergic signaling and NMDA receptor biology, which provides a physiological context for substrate recognition and membrane engagement.
Transporter- or pore-mediated translocation
In simple terms: Then, a protein channel or carrier moves D-aspartate across the membrane.
The core event of GO:0070777 is the translocation of D-aspartate across the lipid bilayer from one side of a membrane to the other by means of a transporter or pore. This step distinguishes the process from passive diffusion and places it within the broader class of membrane transport processes. NMDA receptors are ion channels whose conductance properties and regulation are shaped by subunits such as GRIN1, GRIN2A, GRIN2B, GRIN2C, GRIN2D, GRIN3A, and GRIN3B, and these receptors are part of the signaling environment in which acidic amino acid transport occurs.
Coupling to glutamatergic signaling
In simple terms: After transport, D-aspartate can influence glutamate-based communication between neurons.
Once D-aspartate crosses the membrane, it can participate in glutamatergic signaling pathways. NMDA receptors mediate tripartite signaling involving neurons and glia, and their activity is influenced by subunit composition and allosteric modulation. GluD1 is a receptor that functions as a signal transduction device despite its ionotropic receptor architecture, illustrating the diversity of glutamate-related signaling mechanisms that may intersect with D-aspartate transport. These signaling connections make D-aspartate transport relevant to synaptic plasticity and neuronal communication.
Regulation by receptor and synaptic machinery
In simple terms: The transport process is tuned by receptor subunits and synaptic proteins.
D-aspartate transmembrane transport is regulated in the context of receptor and synaptic machinery. NMDA receptor conductance control and neurosteroid binding modulate receptor activity, which in turn shapes the signaling environment for acidic amino acids. Synaptotagmins are synaptic proteins linked to neurodegeneration, and their involvement in synaptic function connects membrane trafficking and transport processes to neuronal health. Memantine inhibition of calcium-permeable AMPA receptors further demonstrates that pharmacological modulation of glutamate receptor activity can affect acidic amino acid signaling.
Downstream cellular consequences
In simple terms: Finally, transport affects cell signaling, excitability, and disease-relevant pathways.
The downstream consequences of D-aspartate transmembrane transport include effects on neuronal excitability, synaptic signaling, and disease-relevant pathways. GRIN2A and GRIN2B variants alter receptor function and cause neurodevelopmental disorders, and the functional consequences of these variants can be predicted from genotype. Because D-aspartate transport is coupled to glutamatergic signaling, disruptions in transport or receptor function may contribute to neurodegeneration and excitotoxicity. These consequences make GO:0070777 a meaningful annotation for studies of neurological disease mechanisms.
Key Genes Involved in GO:0070777 D-aspartate transmembrane transport
The following genes and proteins are functionally linked to D-aspartate transmembrane transport through their roles in glutamatergic signaling, NMDA receptor biology, and synaptic function.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GRIN1 | Obligatory NMDA receptor subunit | Core component of NMDA receptor signaling relevant to acidic amino acid transport context |
| GRIN2A | NMDA receptor subunit | GRIN2A-related disorders show genotype-phenotype correlations |
| GRIN2B | NMDA receptor subunit | GRIN2B encephalopathy is linked to variant clustering and functional consequences |
| GRIN2C | NMDA receptor subunit | Contributes to NMDA receptor diversity in adult cortex and hippocampus |
| GRIN2D | NMDA receptor subunit | Part of the NMDA receptor subunit repertoire influencing conductance and signaling |
| GRIN3A | NMDA receptor subunit | Non-canonical NMDA receptor subunit contributing to receptor diversity |
| GRIN3B | NMDA receptor subunit | Non-canonical NMDA receptor subunit contributing to receptor diversity |
| GRID1 | Glutamate receptor delta subunit | GluD1 functions as a signal transduction device disguised as an ionotropic receptor |
| GRID2 | Glutamate receptor delta subunit | Delta receptor family member relevant to glutamate signaling |
| GRIA1 | AMPA receptor subunit | Calcium-permeable AMPA receptors are inhibited by memantine |
| GRIA2 | AMPA receptor subunit | AMPA receptor composition influences calcium permeability and signaling |
| GRIA3 | AMPA receptor subunit | AMPA receptor diversity relevant to glutamatergic signaling |
| GRIA4 | AMPA receptor subunit | AMPA receptor diversity relevant to glutamatergic signaling |
| SYT1 | Synaptotagmin | Synaptotagmins are linked to neurodegeneration and synaptic function |
| SYT2 | Synaptotagmin | Synaptotagmin family member involved in synaptic processes |
| SLC1A1 | Glutamate transporter | Transport-related gene relevant to acidic amino acid handling |
| SLC1A2 | Glutamate transporter | Transport-related gene relevant to acidic amino acid handling |
How Is D-aspartate transmembrane transport Regulated?
D-aspartate transmembrane transport is regulated in the context of glutamatergic signaling and receptor activity. NMDA receptor conductance control and neurosteroid binding modulate receptor function, which shapes the signaling environment for acidic amino acids. Tripartite signaling by NMDA receptors involves neurons and glia, indicating that transport and signaling are regulated across multiple cell types. Synaptotagmins and synaptic machinery are linked to neurodegeneration, connecting transport regulation to synaptic health. Memantine inhibition of calcium-permeable AMPA receptors demonstrates pharmacological regulation of glutamate receptor activity that can influence acidic amino acid signaling. GRIN2A and GRIN2B variant functional consequences further show that genetic regulation of receptor subunits affects downstream signaling.
D-aspartate transmembrane transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GRIN2A | GRIN2A-related neurodevelopmental disorders | Knockout and point-mutation models in neuronal cells |
| GRIN2B | GRIN2B encephalopathy | Knock-in models carrying patient variants |
| GRIA1 | Calcium-permeable AMPA receptor signaling | Overexpression and point-mutation models |
| SYT1 | Neurodegeneration and synaptic dysfunction | Knockout models in neuronal cultures |
| GRID1 | Non-canonical glutamate receptor signaling | Knockout and tagged knock-in models |
GRIN2A-related neurodevelopmental disorders
GRIN2A-related disorders show genotype and functional consequence predict phenotype, linking NMDA receptor dysfunction to neurodevelopmental disease. Because D-aspartate transmembrane transport is coupled to glutamatergic signaling, GRIN2A variants may alter the signaling environment in which D-aspartate acts.
GRIN2B encephalopathy
GRIN2B encephalopathy is associated with novel phenotype findings, variant clustering, functional consequences, and treatment aspects. These findings make GRIN2B a key gene for understanding how receptor dysfunction relates to D-aspartate transport and signaling.
Neurodegeneration and synaptic dysfunction
Synaptotagmins are linked to neurodegeneration, and their roles in synaptic function connect membrane transport processes to neuronal injury. NMDA receptor tripartite signaling and calcium-permeable AMPA receptor modulation further link acidic amino acid transport to excitotoxicity and neurodegeneration.
Glutamate receptor signaling in disease
GluD1 functions as a signal transduction device disguised as an ionotropic receptor, highlighting non-canonical glutamate receptor signaling that may intersect with D-aspartate transport in disease contexts. NMDA receptor conductance control and neurosteroid binding also provide mechanisms by which receptor dysfunction can contribute to disease.
From D-aspartate transmembrane transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate gene alter D-aspartate transport? | CRISPR knockout cell model |
| Does a patient variant change receptor function? | CRISPR point-mutation knock-in model |
| Can a tagged transporter be tracked in live cells? | Tagged knock-in model |
| Does overexpression of a receptor subunit change signaling? | CRISPR overexpression model |
| Which genes regulate D-aspartate transport in neurons? | CRISPR library screening |
| What pathways are enriched in transport-related mutants? | Bioinformatics and RNA-seq analysis |
How to Study the D-aspartate transmembrane transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Functional transport assay | D-aspartate movement across membranes | Testing transporter or pore function |
| Electrophysiology | Ion channel conductance and receptor activity | NMDA and AMPA receptor functional studies |
| CRISPR knockout | Loss-of-function effects on transport | Causal gene testing |
| CRISPR point mutation | Effect of specific variants | Patient variant modeling |
| Tagged knock-in | Protein localization and trafficking | Live-cell imaging of transporters |
| RNA-seq | Transcriptional changes | Pathway analysis in transport mutants |
| Proteomics | Protein abundance and interactions | Identifying transport complex components |
| Bioinformatics | Pathway and network enrichment | GO:0070777 annotation analysis |
Functional transport assays
Functional transport assays measure the movement of D-aspartate across membranes using labeled substrates or electrophysiological readouts. These assays can be coupled to receptor activity measurements because NMDA receptor conductance and neurosteroid binding modulate the signaling environment.
Electrophysiology
Electrophysiology measures ion channel activity and receptor conductance, which is directly relevant to NMDA receptor function and acidic amino acid signaling. Memantine inhibition of calcium-permeable AMPA receptors illustrates how electrophysiological and pharmacological approaches can be combined.
CRISPR screening and functional genomics
CRISPR screening enables systematic testing of genes that regulate D-aspartate transport and related signaling pathways. GRIN2A and GRIN2B variant functional consequences can be assessed using CRISPR models to link genotype to phenotype.
Bioinformatics and pathway analysis
Bioinformatics and pathway analysis integrate transcriptomic and functional data to identify pathways enriched in transport-related mutants. GO:0070777 provides a precise annotation for enrichment analysis of D-aspartate transmembrane transport.
How CRISPR Can Be Used to Study GO:0070777 D-aspartate transmembrane transport
Knockout
CRISPR knockout models delete candidate genes to test whether they are required for D-aspartate transmembrane transport. Knockout of GRIN2A or GRIN2B can reveal loss-of-function effects on receptor signaling and downstream phenotypes.
Point Mutation
CRISPR point-mutation models introduce specific patient variants to test their functional consequences. GRIN2A and GRIN2B variant functional consequences can be predicted from genotype, making point-mutation models valuable for mechanistic studies.
Knock-in
CRISPR knock-in models insert tags or reporter sequences to track transport-related proteins in their native context. Tagged knock-in of receptor subunits can reveal localization and trafficking relevant to D-aspartate transport.
Overexpression
CRISPR overexpression models increase the level of a candidate gene to test gain-of-function effects on D-aspartate transport and signaling. Overexpression of NMDA receptor subunits can alter conductance and downstream signaling.
How EDITGENE Supports D-aspartate transmembrane transport Research
Researchers studying D-aspartate transmembrane transport-related genes often need to determine whether a candidate gene is causally involved in transport, signaling, or disease phenotypes. EDITGENE provides CRISPR-based cell models and screening services that enable precise functional dissection of these genes in relevant cellular contexts.
Contact EDITGENE today to design your custom CRISPR model for D-aspartate transmembrane transport research.
Frequently Asked Questions About D-aspartate transmembrane transport
What is D-aspartate transmembrane transport?
D-aspartate transmembrane transport (GO:0070777) is the process in which D-aspartate, the D-enantiomer of the aspartate anion, is transported across a lipid bilayer from one side of a membrane to the other by means of a transporter or pore.
What is the GO ID for D-aspartate transmembrane transport?
The GO ID is GO:0070777.
What genes are involved in D-aspartate transmembrane transport?
Genes involved in glutamatergic signaling and NMDA receptor biology, such as GRIN1, GRIN2A, GRIN2B, GRIN2C, GRIN2D, GRIN3A, and GRIN3B, are functionally relevant to the transport context.
Why is D-aspartate transmembrane transport important?
It is important because D-aspartate is a signaling-relevant acidic amino acid, and its membrane movement influences glutamatergic signaling and NMDA receptor function.
Which diseases are linked to D-aspartate transport genes?
GRIN2A-related disorders and GRIN2B encephalopathy are linked to NMDA receptor dysfunction, and neurodegeneration pathways are also relevant.
How can I study D-aspartate transmembrane transport?
You can study it using functional transport assays, electrophysiology, CRISPR knockout or point-mutation models, and bioinformatics analysis.
What is the definition of GO:0070777?
GO:0070777 is defined as the process in which D-aspartate, the D-enantiomer of the anion of (2R)-2-aminobutanedioic acid, is transported across a lipid bilayer from one side of a membrane to the other by means of some agent such as a transporter or pore.
Does D-aspartate transport relate to NMDA receptors?
Yes, D-aspartate transport is functionally coupled to glutamatergic signaling and NMDA receptor biology, where subunits such as GRIN1, GRIN2A, and GRIN2B shape receptor function.
What CRISPR models are useful for D-aspartate transport research?
Knockout, point-mutation, knock-in, and overexpression models are useful for testing causal roles of transport-related genes.
What is the role of GRIN2B in D-aspartate transport research?
GRIN2B encodes an NMDA receptor subunit, and GRIN2B encephalopathy is associated with variant clustering and functional consequences relevant to glutamatergic signaling.
Conclusion
GO:0070777, D-aspartate transmembrane transport, defines the transporter- or pore-mediated movement of D-aspartate across a lipid bilayer. Its functional context is tightly linked to glutamatergic signaling and NMDA receptor biology, where genes such as GRIN1, GRIN2A, GRIN2B, GRIN2C, GRIN2D, GRIN3A, and GRIN3B shape receptor function and disease phenotypes. Understanding this process is important for neurodevelopmental disorders, neurodegeneration, and synaptic signaling research. CRISPR-based models, including knockout, point-mutation, knock-in, and overexpression, provide powerful tools for causal dissection of D-aspartate transport-related genes. Combined with functional transport assays, electrophysiology, and bioinformatics, these approaches can clarify how D-aspartate movement contributes to neuronal function and disease.
References
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