Tailored Host System Development
Engineering of orthogonal pairs and optimization of incorporation protocols for non-standard host organisms beyond E. coli, including yeast, mammalian cell lines, or specialized CFPS extracts.
Genetic code expansion (GCE) technology enables the site-specific incorporation of non-canonical amino acids (ncAAs) into proteins. A powerful application involves incorporating ncAAs bearing bioorthogonal chemical handles, such as azides or alkynes, directly during protein synthesis. These handles then serve as precise attachment points for subsequent "click chemistry" reactions, allowing for highly specific, covalent conjugation to fluorophores, polymers, affinity tags, or other molecules without interfering with native biological processes. As a leading provider in preclinical services, we offer a comprehensive GCEngine platform that integrates high-throughput orthogonal aaRS/tRNA pair development with downstream click chemistry applications. Our end-to-end solutions empower synthetic biology research, from foundational tool identification to advanced in vivo applications, establishing us as a trusted partner in next-generation GCE.
The methodology of click chemistry supporting ncAA incorporation is a two-stage, site-specific protein engineering strategy. In the first stage, a tailored orthogonal aaRS/tRNA pair is used to co-translationally incorporate an ncAA containing a bioorthogonal functional group (e.g., an azide) at a predetermined site within the target protein. This process can be executed in vivo within living cells or in vitro using cell-free protein synthesis (CFPS) systems, the latter offering advantages for incorporating toxic ncAAs or achieving high-yield production. In the second stage, the uniquely introduced chemical handle on the purified or in situ protein is selectively conjugated with a complementary probe or payload (e.g., a fluorophore or drug molecule) via a highly efficient and specific click reaction.
Fig.1 Development of a GCE-based E3-ligand free TPD. (Zheng, Y., et al., 2025).
| Application Area | Description |
| Antibody-Drug Conjugates (ADCs) | Enables the creation of homogeneous ADCs with precise drug-to-antibody ratios (DAR) for improved therapeutic efficacy and safety profiles. |
| Advanced Bio-imaging | Facilitates site-specific labeling with organic fluorophores for super-resolution microscopy and real-time intracellular protein tracking. |
| Protein-Polymer Hybrids | Supports the attachment of PEG or other polymers to enhance the pharmacokinetic properties and half-life of therapeutic proteins. |
| Surface Immobilization | Allows for the oriented attachment of proteins to chips, beads, or nanomaterials for high-sensitivity diagnostic assays and biosensors. |
| Post-Translational Mimicry | Provides a route to study complex modifications by installing stable mimics of phosphorylation, glycosylation, or ubiquitination. |
At the core of our service lies a proprietary GCEngine platform designed to bridge the gap between genetic encoding and chemical precision. By integrating high-throughput screening for orthogonal aaRS/tRNA pairs with optimized in vitro and in vivo expression systems, we provide a seamless pipeline for click-compatible protein engineering. Our expertise ensures that ncAA incorporations are executed with high fidelity and yield, empowering researchers to build complex molecular architectures.
Our services support a spectrum of bioorthogonal click reactions, each with distinct advantages. We provide expert support in selecting the most suitable chemistry based on the need for catalytic metals, reaction kinetics, and the biological environment of the final application.
Copper-Catalyzed Azide-Alkyne Cycloaddition (CuAAC)
A classic, highly efficient reaction with fast kinetics, ideal for in vitro applications where copper toxicity is not a concern. For sensitive proteins, we employ optimized copper-ligand systems to minimize potential oxidative damage.
Strain-Promoted Azide-Alkyne Cycloaddition (SPAAC)
A copper-free alternative that utilizes strained alkynes (e.g., DBCO), offering excellent biocompatibility for in vivo labeling and conjugations where metal catalysts must be avoided.
Inverse Electron-Demand Diels-Alder (IEDDA)
Features exceptionally fast reaction kinetics, often preferred for rapid labeling in vivo or pretargeting strategies. It involves reactions between tetrazines and strained alkenes (e.g., norbornene, trans-cyclooctene).
Recognizing that each research or development project presents unique challenges, we tailor our approach to transform our core platform into a precise tool tailored to your specific needs. By integrating specialized host engineering, novel chemistry, and scalable processes, we deliver solutions that align with your project's goals.
Tailored Host System Development
Engineering of orthogonal pairs and optimization of incorporation protocols for non-standard host organisms beyond E. coli, including yeast, mammalian cell lines, or specialized CFPS extracts.
Multi-site Incorporation of ncAAs
Design and execution of strategies to incorporate two or more distinct ncAAs at different sites within a single protein, enabling multi-functionalization and complex engineering feats.
Specialized ncAA and Payload Synthesis
Collaboration with synthetic chemistry partners to procure or develop custom ncAAs with novel reactive handles or tailored drug payloads and probes for conjugation.
End-to-End Process Development & Scaling
From small-scale proof-of-concept to process development for therapeutic candidates, including comprehensive analytical method development and quality control.
By combining deep expertise in GCE with rich experiences in bioorthogonal click chemistry, we deliver reliable, precise, and innovative solutions that accelerate research and development. Should you be interested in exploring how our click chemistry-supporting ncAA incorporation services can accelerate your therapeutic or diagnostic pipelines, please reach out to our technical team for a detailed consultation.
All our services are exclusively intended for preclinical research purposes. They are not intended for diagnostic, therapeutic, or patient management applications.
A specialized platform advancing genetic code expansion through orthogonal tRNA/aaRS technologies, enabling precise ncAA incorporation for biotherapeutic development, synthetic biology, and diagnostics.