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ncAA Incorporated Peptide Sensor Development

Genetic code expansion (GCE) technology enables the site-specific incorporation of non-canonical amino acids (ncAAs) into proteins, endowing them with novel chemical and physical properties. ncAA-incorporated peptide sensors leverage this capability by integrating unique ncAA functionalities, such as bioorthogonal handles, environmentally sensitive probes, or post-translational modification mimics into peptide frameworks. This enables the development of powerful molecular tools for the real-time detection, imaging, and monitoring of biological processes. As a pioneering biotechnology company and preclinical service provider, we combine deep expertise in high-throughput orthogonal aaRS/tRNA pair development with a comprehensive GCEngine platform to deliver innovative solutions in synthetic biology, including the design and development of advanced peptide-based sensors.

Overview of the ncAA Incorporated Peptide Sensor

An ncAA-incorporated peptide sensor is a rationally designed peptide sequence containing one or more site-specifically embedded ncAAs. These ncAAs act as key sensory elements, conferring the peptide with the ability to respond to specific biochemical or biophysical stimuli. By precisely positioning an ncAA within a peptide scaffold, researchers can create molecular probes that report on specific binding events, enzymatic activities, or microenvironmental changes (e.g., pH, metal ion concentration) with excellent spatial and temporal resolution. This approach preserves the native folding and bioactivity of the peptide while introducing sophisticated functionalities.

A diagram depicting the structure of bapaUGAc and its interaction with UDP-GlcNAc. Fig.1 Graphical representation of the interaction between bapaUGAc and UDP-GlcNAc. (Zhang, J., et al., 2023)

Applications and Advantages of ncAA Incorporated Peptide Sensor

Applications

Expanding the functional boundaries of molecular probes, ncAA-incorporated peptide sensors provide versatile solutions across multiple domains of biotechnology

Real-time monitoring of enzymatic activity (e.g., kinase, protease, phosphatase) in live cells.
High-resolution imaging of subcellular localization, trafficking, and conformational dynamics.
Detection and quantification of specific metabolites, metal ions, or changes in cellular microenvironment (e.g., pH, redox state).
Profiling protein-protein interactions and mapping transient binding events.
Development of novel assay platforms for drug discovery and high-throughput screening.
Creation of targeted diagnostic and theranostic probes with advanced functionalities.

Advantages

Compared to traditional peptide-based probes, sensors utilizing genetic code expansion provide distinct technical advantages that enhance their utility and performance.

Enabling the continuous and self-sustaining production of sensors within living systems this provides the potential for continuous, long-term monitoring.
Providing access to an expansive library of functional groups, including bio-orthogonal "click" handles and unique spectroscopic reporters.
Site-specific integration ensures a uniform, precisely defined sensor structure and function.
Capability for ratiometric or multiplexed sensing with minimal background interference.
Modular design facilitates rapid optimization and adaptation for new targets.

Our Services

Leveraging our proprietary, integrated GCEngine platform, we offer end-to-end services for the development of custom, ncAA-incorporated peptide sensors. Our services encompass initial sensor design consultancy, selection and engineering of suitable orthogonal aaRS/tRNA pairs for the desired ncAA, validation of efficient and faithful ncAA incorporation in vitro, and subsequent testing and optimization of sensor function in relevant biological systems, including live-cell assays.

Workflow for ncAA Incorporated Peptide Sensor Development

Consultation & Design: Analyzing target-ligand interactions and desired readouts to identify optimal insertion sites within the peptide scaffold and selecting candidate ncAAs from an extensive proprietary library.
Orthogonal aaRS/tRNA Pair Engineering: Identification or optimization of a high-performance orthogonal aaRS/tRNA pair specific for the chosen ncAA using our high-throughput screening platform.
Biosynthetic Optimization & Validation: Executing genetic construction and ncAA incorporation via cell-free or microbial expression systems, followed by rigorous MS analysis to confirm site-specific incorporation and chemical purity.
Comprehensive Functional Profiling: Rigorous testing of the sensor's performance, including sensitivity, specificity, dynamic range, kinetics, and stability under conditions mimicking the intended application.
Integrated Application Support: Assistance in implementing the sensor within cellular or more complex model systems, which may include optimization of delivery methods (e.g., plasmid transfection, viral transduction) and final validation in the live environment.

Types of ncAA-Incorporated Peptide Sensors

Diversity in sensor design is achieved through the strategic selection of ncAAs that respond to specific physical or chemical stimuli.

Bioorthogonal Reporters

Incorporate ncAAs with click chemistry handles (e.g., azide, alkyne) for post-expression labeling with dyes or affinity tags, enabling detection, imaging, and pull-down assays.

Environment-Responsive Sensors

Incorporate ncAAs with fluorophores sensitive to polarity, pH, or viscosity, enabling reporting on local microenvironmental changes.

Metalloprotein and Redox-Active Sensors

Utilizing ncAAs with chelating properties or redox-sensitive moieties to monitor metal ion fluxes and oxidative stress with high spatial resolution.

Photo-Control & Crosslinking Sensors

Incorporate light-sensitive ncAAs (e.g., photocaged, crosslinkers) to enable spatiotemporal control of sensor activity or to capture and stabilize transient molecular interactions.

Customized Solutions for ncAA Incorporated Peptide Sensor Development

Our tailored development service is designed to meet unique project challenges, providing flexible solutions from concept to validated tool. We work collaboratively to design sensors based on specific target and application requirements, integrating our GCE platform expertise with advanced peptide engineering to deliver optimized performance.

Bespoke ncAA Synthesis and Screening

Designing and synthesizing novel ncAAs with custom-engineered spectral properties or unique chemical reactivities to meet specific experimental mandates.

Library-Based Orthogonal Pair Evolution

Employ high-throughput directed evolution on custom libraries to discover aaRS/tRNA pairs with superior kinetics and specificity for challenging or novel ncAAs.

In Vivo Sensor Optimization

Tailor sensor constructs (e.g., codon optimization, inclusion of subcellular targeting sequences, utilization of evolved orthogonal systems) for enhanced performance in specific models.

Comprehensive Analytical Support

Provide detailed structural and functional analysis, including data from HPLC, ESI-MS, fluorescence spectroscopy, and kinetic binding studies of sensor-target interactions.

Why Partner with Us?

Proven GCE Platform: Leveraging a proprietary, fully integrated Genetic Code Expansion platform with a demonstrated track record in high-throughput orthogonal pair development for diverse ncAAs.
Domain Expertise: Combining deep expertise in synthetic biology with practical experience in preclinical sensor validation and application within complex biological systems.
End-to-End Partnership: Providing an end-to-end, collaborative journey from initial design to functional validation, ensuring solutions are tailored to specific research or development goals.
Dedicated Scientific Support: Offering access to a specialized knowledge base and technical support dedicated to overcoming the unique challenges of in vivo ncAA incorporation and sensor implementation.

Contact Us

By combining a robust, proprietary GCEngine platform with specialized expertise in peptide engineering, we provide a reliable path to develop novel, high-performance ncAA-incorporated peptide sensors. Our collaborative approach ensures that each project benefits from tailored design and rigorous validation, aiming to deliver tools that can advance research in drug discovery, diagnostics, and fundamental biology. To discuss how our GCEngine platform can accelerate your discovery, please contact us.

References

Baumdick, Martin et al. "A conformational sensor based on genetic code expansion reveals an autocatalytic component in EGFR activation." Nature communications 9.1 (2018): 3847.
Zhang, Jing et al. "Genetically Encoded Boronolectin as a Specific Red Fluorescent UDP-GlcNAc Biosensor." ACS sensors 8.8 (2023): 2996-3003.

All our services are exclusively intended for preclinical research purposes. They are not intended for diagnostic, therapeutic, or patient management applications.