Genetic code expansion (GCE) is a pivotal technology in modern synthetic biology, enabling the precise tuning of protein functionality at the molecular level. It drives innovation across diverse fields, including therapeutic development, materials science, and industrial biotechnology. Our proprietary GCEngine platform facilitates the precise, site-specific incorporation of non-canonical amino acids (ncAAs) into proteins. As a pioneer in this field, we provide the essential platforms and services to push the boundaries of what is biologically possible.
Synthetic biology is an emerging field concentrating on crossing the divisions of "natural" and "unnatural" in a bottom-up fashion. It involves the systematic characterization of biomolecules with catalytic or regulatory functions and the assembly of these standardized parts into functional modules, genetic circuits, and engineered chassis strains with customizable attributes. Expanding the genetic code allows researchers to introduce new chemical functionalities into proteins with single-residue precision, create biological parts with properties that are difficult or impossible to achieve using only natural amino acids, and build genetic circuits and chassis strains whose behavior can be regulated by externally supplied ncAAs or physical stimuli. In this way, GCE does not just modify existing biology; it extends the design space of synthetic biology itself.
Fig.1 GCE for synthetic biology. (Tang, H., et al., 2022)
Biological Parts Engineering
The fundamental units of any biological system, including enzymes, receptors, scaffolds, and switches, are defined by their nucleotide or amino acid sequence. With GCE, a wide range of ncAAs can be precisely incorporated into these proteins, greatly expanding both structural and functional diversity. In practice, ncAA-enabled parts can be designed to carry unique reactive groups for controlled conjugation or immobilization, exhibit tailored stability, activity, or binding specificity, or serve as modular “sockets” for attaching cofactors, fluorophores, or materials components.
Genetic Circuits Design
Composed of various biomolecular components, genetic circuits can be precisely engineered to manage and reprogram specific cellular processes. Synthetic gene circuits encompass oscillators, logic gates, and genetic switches. With ncAA-enabled circuits, you can construct artificial genetic switches whose activity depends on the presence or absence of specific ncAAs, use photocrosslinking or photoresponsive ncAAs to create light-controlled regulatory elements, or implement logic behaviors where circuit function is gated by orthogonal translation components, adding safety and containment.
Chassis Strain Construction
GCE utilizes orthogonal aaRS/tRNA pairs and ncAAs that do not occur under natural conditions and operate largely independently of the host’s native translation machinery. When integrated into a chassis strain, these orthogonal translation components can function as a tunable regulatory layer that minimally perturbs endogenous cellular processes. They can also be applied to construct recombinant cells for the biosynthesis of high-value functional products, such as specialized peptides, proteins, or materials-relevant biomolecules.
Biosynthesis of Products
Recently, GCE has been utilized to optimize the attributes of high-value products such as RiPPs and antibodies. It has been used to engineer RiPPs to enhance their native functions, pharmacokinetics, or to generate new functions. It is also widely applied in generating homogeneous conjugates, for example, site-specific ADCs, where ncAA side chains react orthogonally and with high specificity under physiological conditions.
Empowered by a high-throughput platform for discovering and optimizing orthogonal aaRS/tRNA pairs, we offer end-to-end solutions for integrating ncAAs into synthetic biology projects. Our services range from the initial identification of robust orthogonal systems for your chosen ncAA to comprehensive in vitro validation and in vivo application. We provide the critical components and expertise required to successfully implement GCE in your engineered biological systems.
Expanding the genetic code provides a versatile toolkit for rational protein design, moving beyond the functional limitations of the 20 canonical amino acids. The strategic selection of ncAAs based on their unique physicochemical properties is fundamental to engineering novel functionalities. Our platform specializes in the site-specific incorporation of a diverse range of ncAAs, each designed for a specific purpose, enabling distinct capabilities for synthetic biology applications.
Cell-free protein synthesis systems offer a rapid and flexible platform for site-specific incorporation of ncAAs, bypassing the complexities of cellular uptake and viability. Our service provides highly efficient, customized in vitro translation systems, equipped with the necessary orthogonal aaRS/tRNA pairs and aminoacylation components, to enable high-yield production of novel proteins for downstream screening and characterization.
Combining deep expertise in orthogonal pair development with a comprehensive, collaborative approach, we help ensure a seamless transition from concept to functional prototype. Our platform accelerates the design-build-test-learn cycle for synthetic biology, providing you with reliable, validated tools to de-risk your projects. Contact us to explore how our GCEngine platform can serve as the foundation for your next breakthrough.
A specialized platform advancing genetic code expansion through orthogonal tRNA/aaRS technologies, enabling precise ncAA incorporation for biotherapeutic development, synthetic biology, and diagnostics.