First synthetic protein motor moves along DNA in controlled, programmable steps

A groundbreaking achievement in synthetic biology has emerged with the creation of the first artificial protein motor capable of moving along DNA in controlled, programmable steps. Researchers from UNSW Sydney have developed a protein known as Tumbleweed, which mimics natural molecular motors found within living organisms. This protein motor is designed to move along engineered DNA tracks using a series of three binding sites, referred to as “feet,” that attach to specific DNA sequences. The movement of Tumbleweed is regulated by altering the chemical environment surrounding it, allowing scientists to dictate both the timing and direction of its motion. The findings were published in the journal Nature Nanotechnology, marking a significant milestone in the fields of synthetic biology and nanotechnology. According to Professor Paul Curmi from UNSW, the accomplishment is the result of over two decades of collaborative research involving teams from both national and international institutions. He emphasized that the ability to engineer new behaviors into proteins by combining existing biological components opens up exciting possibilities for understanding and manipulating molecular machinery. In nature, molecular motors such as kinesin, dynein, and myosin play crucial roles in transporting cellular cargo, enabling muscle contractions, and performing other vital mechanical functions necessary for life. The challenge of building artificial motor proteins from the ground up has long been a focus of scientific inquiry due to the potential insights it offers into the workings of these intricate systems and their possible redesigns for specialized applications. Tumbleweed was constructed from protein modules that individually lack motor functionality. However, when combined, these modules form a functional machine capable of walking along engineered DNA tracks. Each step taken by Tumbleweed measures approximately 16 nanometers and occurs in response to external chemical signals. Importantly, the direction of movement can be reversed merely by adjusting the sequence of these signals, showcasing the level of control achievable with this technology. This development sets the stage for further exploration into the mechanisms governing molecular motors and paves the way for the engineering of synthetic versions tailored for specific tasks. Professor Curmi highlighted the importance of this endeavor by referencing physicist Richard Feynman’s assertion that “what I cannot create, I do not understand.” Through the construction of Tumbleweed, researchers aim to uncover the fundamental principles underlying nanoscale protein motors and begin to comprehend the trade-offs associated with their design. Currently, the team is focused on refining Tumbleweed’s capabilities, aiming to extend its travel distance beyond the current limit of about 100 nanometers and increase its speed from the present rate of approximately 1 nanometer per second. Looking ahead, the researchers are exploring the possibility of creating autonomous designs that operate independently without requiring external control. The implications of this breakthrough extend beyond basic research, offering a foundation for the development of future programmable protein nanomachines and potentially autonomous synthetic molecular motors. These innovations could lead to advancements in areas such as massively parallel biocomputation, which promises to be more energy-efficient, sustainable, and scalable than current technologies. As the field continues to evolve, the potential applications of such synthetic motors remain vast and largely unexplored, heralding a new era in the manipulation of molecular processes at the nanoscale.