DNA origami nanosyringe actively transports molecules into synthetic cells

A breakthrough in nanotechnology has been achieved with the creation of a DNA origami nanosyringe capable of actively transporting molecules into synthetic cells. The innovation, developed by researchers at the University of Stuttgart’s 2nd Physics Institute, represents a significant leap in the field of synthetic biology and molecular engineering. Published in Nature Nanotechnology, the study outlines how the nanosyringe uses mechanical motion to achieve controlled and reversible transport across lipid membranes, mimicking the functionality of biological systems such as bacterial injection systems and intracytoplasmic sperm injection techniques. The nanosyringe operates on principles akin to those found in natural biological mechanisms. Just as intracytoplasmic sperm injection involves the direct introduction of a sperm cell into an egg, the DNA-based device employs mechanical penetration to bypass the limitations of passive diffusion. This method ensures direct access to the interior of synthetic cells, offering a level of precision previously unattainable with traditional transport methods. The device was designed to anchor onto lipid membranes, move its needle through programmed mechanical action, deliver molecular cargo, and then retract to maintain membrane integrity. The structure of the nanosyringe includes two key components: a membrane-anchoring base and a movable needle linked via a reversible sliding mechanism. This design allows the device to perform a fully programmable mechanical cycle. By utilizing DNA strand-displacement reactions, the needle can be driven forward to penetrate the membrane and pulled back to withdraw, ensuring the process is both controllable and repeatable. This capability means the nanosyringe can transport molecular cargo without causing permanent damage to the cell membrane, preserving the structural integrity of the synthetic cells. Beyond mere transport, the research team demonstrated that the nanosyringe serves as a versatile tool for controlling biochemical processes within synthetic cells. By using the same platform, they were able to initiate DNA hybridization chain reactions at specific locations on the membrane, activate RNA transcription through targeted delivery of promoter activators, and introduce catalytic DNAzymes that selectively cleave RNA substrates within enclosed compartments. These experiments highlight the potential of the nanosyringe to serve as a programmable interface, enabling precise regulation of complex biochemical pathways. The implications of this discovery extend far beyond the laboratory. Researchers believe the integration of mechanical motion into DNA nanotechnology opens new avenues for synthetic biology, molecular therapeutics, and engineered biointerfaces. Future applications could include the programmable delivery of proteins, nucleic acids, and other functional biomolecules, which could revolutionize drug delivery and cellular therapy. As Dr. Longjiang Ding, the study's first author, noted, the ability to dynamically interact with living systems could lead to more effective and responsive medical treatments. Looking ahead, the team aims to refine the technology further, exploring ways to enhance the efficiency and specificity of the nanosyringe. They envision a future where such devices can seamlessly integrate with biological systems, facilitating real-time interaction and response. With continued advancements, the DNA origami nanosyringe stands poised to transform our understanding and application of molecular-scale engineering.