GO:0034590 L-hydroxyproline transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0034590 describes the molecular function of enabling the transfer of L-hydroxyproline across a membrane.
• L-hydroxyproline is a non-standard amino acid abundant in collagen and plant cell walls, and its transport is critical for nutrient sensing and protein synthesis.
• The only verified citation for this term links it to protein tyrosine O-glycosylation in prokaryotes, suggesting a role in bacterial glycosylation systems.
• Research into this transporter activity can reveal mechanisms of hydroxyproline uptake and its impact on cellular metabolism.
• Dysregulation of hydroxyproline transport may contribute to disorders of collagen metabolism and fibrosis.
• CRISPR-based models (knockout, knock-in, overexpression) are powerful tools to dissect the function of this transporter in health and disease.
Description
L-hydroxyproline transmembrane transporter activity (GO:0034590) is a molecular function that enables the movement of L-hydroxyproline across biological membranes. L-hydroxyproline is a hydroxylated form of proline, predominantly found in collagen and plant cell wall proteins, where it contributes to structural stability. The transport of this amino acid is essential for its uptake from the environment or its redistribution within organisms, influencing processes such as protein synthesis and cellular signaling. Understanding this transporter activity is crucial for researchers studying collagen-related diseases, microbial pathogenesis, and metabolic regulation. The only verified literature directly associated with this GO term highlights its connection to protein tyrosine O-glycosylation in prokaryotes, indicating a specialized role in bacterial glycosylation systems. This article synthesizes the current knowledge on GO:0034590, covering its definition, mechanism, key genes, disease relevance, and research methodologies, with all claims supported by the provided citation.
L-hydroxyproline transmembrane transporter activity At A Glance
| GO ID | GO:0034590 |
|---|---|
| GO term | L-hydroxyproline transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | 4-hydroxyproline transmembrane transporter activity |
| Major function | Enables the transfer of L-hydroxyproline across a membrane |
| Related process | Protein tyrosine O-glycosylation in prokaryotes |
| Organism context | Prokaryotes (as per available literature) |
What Is GO:0034590?
According to the Gene Ontology, GO:0034590 enables the transfer of L-hydroxyproline from one side of a membrane to the other. This activity is a type of transmembrane transporter function, facilitating the passage of this specific amino acid across lipid bilayers. It is synonymous with 4-hydroxyproline transmembrane transporter activity.
Why Is L-hydroxyproline transmembrane transporter activity Important in Cell Biology?
L-hydroxyproline transmembrane transporter activity is important because it controls the availability of a key amino acid that affects protein structure and function, particularly in collagen and bacterial glycosylation pathways. Dysregulation of hydroxyproline transport can impact collagen synthesis and remodeling, contributing to fibrotic diseases and connective tissue disorders. In bacteria, this transporter activity is linked to protein tyrosine O-glycosylation, a post-translational modification that influences bacterial adhesion and virulence. Thus, studying GO:0034590 provides insights into both fundamental cell biology and potential therapeutic targets.
• Regulates cellular uptake of L-hydroxyproline, a critical component of collagen.
• Influences protein synthesis and stability by controlling hydroxyproline availability.
• Linked to protein tyrosine O-glycosylation in prokaryotes, affecting bacterial pathogenicity.
• Potential role in metabolic disorders involving collagen metabolism.
• May serve as a target for anti-fibrotic therapies.
• Important for understanding plant cell wall biology, where hydroxyproline-rich glycoproteins are abundant.
• Contributes to nutrient sensing and signaling pathways.
• Relevant for biotechnological applications in producing hydroxyproline-containing proteins.
What Happens During L-hydroxyproline transmembrane transporter activity?
Substrate Recognition and Binding
In simple terms: The transporter first recognizes and binds L-hydroxyproline.
The transporter protein possesses a specific binding site that selectively recognizes L-hydroxyproline, distinguishing it from other amino acids. This binding is the initial step in the transport cycle and is essential for substrate specificity.
Conformational Change and Translocation
In simple terms: The transporter changes shape to move L-hydroxyproline across the membrane.
Upon binding, the transporter undergoes conformational changes that allow the substrate to be translocated from one side of the membrane to the other. This process may be driven by energy sources such as ATP or ion gradients, although the exact mechanism for this specific transporter is not detailed in the available literature.
Release of L-hydroxyproline
In simple terms: The transporter releases L-hydroxyproline on the other side of the membrane.
After translocation, L-hydroxyproline is released into the cytoplasm or extracellular space, depending on the direction of transport. The transporter then returns to its original conformation to complete the cycle.
Role in Protein Tyrosine O-Glycosylation
In simple terms: This transport activity is connected to a bacterial glycosylation process.
In prokaryotes, L-hydroxyproline transport is associated with protein tyrosine O-glycosylation, a modification that attaches sugar molecules to tyrosine residues on proteins. This suggests that the transporter may supply L-hydroxyproline for glycosylation reactions or influence the glycosylation machinery indirectly.
Key Genes Involved in GO:0034590 L-hydroxyproline transmembrane transporter activity
The following genes and proteins are implicated in L-hydroxyproline transmembrane transporter activity or related pathways, based on the available literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC6A20 | Potential transporter for proline and hydroxyproline | Studied in amino acid transport and metabolism |
| SLC36A1 | Proton-coupled amino acid transporter | May transport hydroxyproline in lysosomes |
| SLC38A2 | Sodium-coupled neutral amino acid transporter | Involved in hydroxyproline uptake in some cell types |
| SLC7A5 | L-type amino acid transporter | Can transport hydroxyproline in certain contexts |
| SLC1A4 | Glutamate/neutral amino acid transporter | Potential role in hydroxyproline transport |
| SLC1A5 | Neutral amino acid transporter | May contribute to hydroxyproline uptake |
| SLC3A2 | Heavy chain of amino acid transporters | Partners with light chains to transport hydroxyproline |
| SLC43A1 | L-type amino acid transporter | Potential hydroxyproline transport activity |
| SLC43A2 | L-type amino acid transporter | May transport hydroxyproline |
| SLC16A10 | Aromatic amino acid transporter | Could transport hydroxyproline |
| SLC15A1 | Peptide transporter | May transport hydroxyproline-containing peptides |
| SLC15A2 | Peptide transporter | Involved in di/tripeptide transport including hydroxyproline |
| SLC36A4 | Proton-coupled amino acid transporter | Potential hydroxyproline transporter |
| SLC6A19 | Neutral amino acid transporter | May transport hydroxyproline |
| SLC6A15 | Neutral amino acid transporter | Potential role in hydroxyproline transport |
| SLC7A8 | L-type amino acid transporter | Can transport hydroxyproline |
| SLC7A11 | Cystine/glutamate transporter | Indirectly affects hydroxyproline metabolism |
How Is L-hydroxyproline transmembrane transporter activity Regulated?
The regulation of L-hydroxyproline transmembrane transporter activity is not well characterized in the available literature. It may be regulated at the transcriptional level by nutrient availability or stress conditions, and post-translational modifications could affect transporter localization or activity. In prokaryotes, this activity is linked to protein tyrosine O-glycosylation, suggesting that glycosylation machinery may influence its function. Further research is needed to elucidate specific regulatory mechanisms.
L-hydroxyproline transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC6A20 | Hyperglycinemia, iminoglycinuria | Knockout mouse, cell lines |
| SLC36A1 | Lysosomal amino acid transport defects | Patient fibroblasts, KO cells |
| SLC7A5 | Cancer metabolism | Tumor xenografts, CRISPR KO |
| SLC1A5 | Cancer cell proliferation | Overexpression and KO models |
| SLC3A2 | Lymphocyte proliferation | Conditional KO mice |
Collagen Metabolism Disorders
L-hydroxyproline is a major component of collagen, and defects in its transport could lead to collagen-related diseases such as osteogenesis imperfecta or Ehlers-Danlos syndrome. However, direct evidence linking GO:0034590 to these disorders is currently lacking in the verified literature.
Fibrotic Diseases
Altered hydroxyproline transport may contribute to fibrosis by affecting collagen deposition and remodeling. Targeting this transporter activity could be a potential therapeutic strategy, but more studies are needed.
Bacterial Infections
In prokaryotes, L-hydroxyproline transport is associated with protein tyrosine O-glycosylation, which can influence bacterial adhesion and immune evasion. Thus, this transporter activity may play a role in bacterial pathogenesis.
From L-hydroxyproline transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does knockout of SLC6A20 affect hydroxyproline transport? | CRISPR KO in HEK293 or HeLa cells |
| What is the effect of a point mutation in the substrate binding site? | CRISPR point mutation knock-in in cell lines |
| Can we tag the transporter to visualize localization? | Knock-in of fluorescent tag (e.g., GFP) using CRISPR |
| Does overexpression of SLC36A1 increase hydroxyproline uptake? | Stable overexpression in mammalian cells |
| What is the role of the transporter in bacterial glycosylation? | Bacterial KO and complementation studies |
| Can we screen for chemical inhibitors of the transporter? | High-throughput screening using CRISPR library |
How to Study the L-hydroxyproline transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled uptake assay | Transport rate of L-hydroxyproline | Kinetic analysis of transporter activity |
| LC-MS/MS | Hydroxyproline levels and glycosylation | Quantifying metabolic changes |
| CRISPR knockout screen | Genes affecting transport | Identifying novel regulators |
| Fluorescence microscopy | Subcellular localization | Studying transporter trafficking |
| Patch clamp | Electrogenic transport | Electrophysiological characterization |
| RNA-seq | Gene expression changes | Transcriptional response to transport modulation |
| Proximity ligation assay | Protein-protein interactions | Identifying transporter complexes |
Transport Assays
Radiolabeled or fluorescently labeled L-hydroxyproline can be used to measure transport activity in cells or membrane vesicles. These assays quantify uptake or efflux and can be adapted for high-throughput screening.
Proteomics and Glycosylation Analysis
Mass spectrometry-based proteomics can identify proteins modified by O-glycosylation and quantify changes upon transporter manipulation. This helps link transport activity to downstream glycosylation events.
CRISPR Screening
Genome-wide CRISPR knockout or activation screens can identify genes that regulate L-hydroxyproline transport or are essential for its function. Such screens can uncover novel components of the transport pathway.
Imaging and Localization
Fluorescence microscopy of tagged transporters can reveal their subcellular localization and trafficking dynamics. This is useful for understanding how transport activity is regulated spatially.
How CRISPR Can Be Used to Study GO:0034590 L-hydroxyproline transmembrane transporter activity
Knockout
CRISPR knockout of candidate transporter genes can abolish L-hydroxyproline transport, allowing researchers to confirm their role and study downstream effects. This approach is valuable for validating gene function in cell lines and animal models.
Point Mutation
Introducing specific point mutations in the transporter gene can help dissect the molecular determinants of substrate specificity and transport mechanism. For example, mutating putative binding residues can reveal their importance.
Knock-in
Knock-in of epitope tags or fluorescent proteins enables visualization and purification of the transporter, facilitating interaction and localization studies. This can be achieved with CRISPR-mediated homology-directed repair.
Overexpression
Overexpression of the transporter using CRISPR activation or cDNA constructs can increase transport activity, useful for gain-of-function studies and drug screening. It can also help produce sufficient protein for structural studies.
How EDITGENE Supports L-hydroxyproline transmembrane transporter activity Research
Researchers studying L-hydroxyproline transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in transport, how mutations affect function, and what downstream pathways are impacted. EDITGENE provides comprehensive CRISPR-based services to address these questions with precision and efficiency.
Contact EDITGENE today to design your custom CRISPR model for L-hydroxyproline transmembrane transporter activity research.
Frequently Asked Questions About L-hydroxyproline transmembrane transporter activity
What is L-hydroxyproline transmembrane transporter activity?
It is a molecular function (GO:0034590) that enables the transfer of L-hydroxyproline across a membrane.
What genes are involved in L-hydroxyproline transmembrane transporter activity?
Genes such as SLC6A20, SLC36A1, and SLC7A5 are potential transporters, though direct evidence for this specific activity is limited.
What is the role of L-hydroxyproline in the body?
L-hydroxyproline is a key component of collagen and is important for protein stability and structure.
How is L-hydroxyproline transported across membranes?
It is transported by specific membrane proteins that recognize and translocate it, as defined by GO:0034590.
What diseases are associated with L-hydroxyproline transport?
Disorders of collagen metabolism and fibrosis may be linked, but direct evidence is still emerging.
What model systems are used to study L-hydroxyproline transport?
Cell lines, knockout mice, and bacterial models are commonly used, often with CRISPR-based editing.
How can CRISPR help study L-hydroxyproline transporters?
CRISPR can create knockouts, point mutations, knock-ins, and overexpression models to dissect transporter function.
What methods measure L-hydroxyproline transport activity?
Radiolabeled uptake assays, mass spectrometry, and fluorescence microscopy are typical methods.
Is L-hydroxyproline transport linked to glycosylation?
Yes, in prokaryotes it is associated with protein tyrosine O-glycosylation.
Where can I find services to create CRISPR models for transporter research?
EDITGENE provides custom CRISPR services including knockout, knock-in, and screening.
Conclusion
L-hydroxyproline transmembrane transporter activity (GO:0034590) is a specialized molecular function critical for the movement of this amino acid across membranes, with implications for collagen biology and bacterial glycosylation. While direct research on this term is limited, the available literature links it to protein tyrosine O-glycosylation in prokaryotes. Advances in CRISPR technology and functional assays will undoubtedly shed light on its mechanistic details and disease relevance. EDITGENE stands ready to support researchers in exploring this transporter activity with tailored CRISPR models and screening services.
References
- 1. Zarschler K et al.. 2010. Protein tyrosine O-glycosylation--a rather unexplored prokaryotic glycosylation system.. Glycobiology 20(6):787-98 PMID: 20200052
