Dynamic Duo Weaves DNA
Researchers use biomolecular nanomachines to create complex DNA materials
Introduction To Biomolecular Nanomachines
Biomolecular nanomachines, such as enzymes and molecular motors, play a crucial role in the synthesis and organization of complex materials in living systems. These nanomachines are powered by chemical energy and are responsible for building, transporting, and organizing biomolecules, allowing living systems to create and maintain highly ordered structures far from thermodynamic equilibrium. The synergy of multiple nanomachines performing sequential, energy-consuming steps is essential for building ordered structures in living systems. However, mimicking this bottom-up chemical and mechanical assembly of matter by artificial means remains a significant challenge.The Challenge Of Linking Nanomachines
Individual components have advanced in molecular robotics, including protein-based molecular motors that provide active transport to overcome diffusion limits. Yet, linking the work of multiple nanomachines in a stepwise process, where one hands off to the next, has proven to be a difficult task. Two primary goals remain unexplored: achieving energy-dissipative self-assembly through dynamic processes and replicating the multistep coordination of different enzymatic and motor functions seen in life. Researchers have been working to develop a system that can dynamically form complex materials through a bottom-up process driven by multiple types of biomolecular nanomachines.A Two-Machine Assembly System
A recent study led by assistant professor Shogo Hamada from the Department of Computer Science, School of Computing, Institute of Science Tokyo, Japan, and co-led by professor Akira Kakugo from Kyoto University, Japan, has made significant progress in this area. The research team developed a system that dynamically forms deoxyribonucleic acid (DNA) network materials through a bottom-up process driven by two types of biomolecular nanomachines: DNA polymerase and molecular motors. The international team included Dr. Farhana Afroze, Dr. Richard Archer, and professor Tetsuya Hiraiwa. The work marks a key step toward constructing nonequilibrium materials that mimic how living systems organize themselves.
The Synthesis Of DNA Biopolymer Networks
The team designed a two-step process for synthesizing and assembling materials from the nanoscale up. First, DNA polymerase amplified DNA templates attached to microtubules through rolling circle amplification (RCA), growing long DNA strands directly on the microtubules. Kinesin motor proteins fixed to a substrate then consumed adenosine triphosphate (ATP) to propel these DNA-carrying microtubules across the surface. When the gliding microtubules collided, the DNA strands riding on them came into contact and connected. As the microtubules moved, they mechanically stretched and pulled the joined DNA strands, resulting in a growing network of organized, fiberlike architectures. In short, DNA polymerase generated the molecular material, and ATP-powered kinesin motors physically assembled it into interconnected structures.The Importance Of Motor Activity
Further experiments confirmed that motor activity is essential to the process. No DNA networks formed when kinesin was absent or when ATP was depleted because the microtubules were not able to move and collide. The research team's findings demonstrate the potential of using biomolecular nanomachines to create complex materials with unique properties. The development of this two-machine assembly system is a significant step forward in the field of molecular robotics and has potential applications in the creation of new materials and devices.
Real-World Implications And Future Outlook
The ability to create complex materials using biomolecular nanomachines has significant implications for a range of fields, including biotechnology, materials science, and medicine. The development of new materials with unique properties could lead to breakthroughs in areas such as tissue engineering, drug delivery, and biosensing. Further research is needed to fully explore the potential of this technology and to overcome the challenges associated with scaling up the production of complex materials using biomolecular nanomachines. However, the progress made by the research team is a promising step towards the creation of new materials and devices that could have a significant impact on our daily lives.Sources
This is an original synthesis by Qivorane based on reporting from the outlets below.