https://pages.htgaa.org/2026a/sofia-oikonomou/homework/week-09-hw-cell-free-systems/index.htmlCell-free systems 🧪 General homework questions 1. Explain the main advantages of cell-free protein synthesis over traditional in vivo methods, specifically in terms of flexibility and control over experimental variables. Name at least two cases where cell-free expression is more beneficial than cell production. Compared to conventional in vivo methods, cell-free protein synthesis provides modularity and substantially higher experimental control, as all the system’s components can be readily added or removed, especially when the strategy employed is to separately produce or extract each cellular element required for the process and then combine them all together into a single reaction. Cell-free systems also offer the potential for precise control over reaction conditions, such as pH and ion concentration, while being more flexible and versatile since they allow the expression of proteins deleterious to living cells, support the integration of non-natural and non-canonical amino acids into peptide backbones, and are compatible with diverse DNA templates (linear or plasmid). Additionally, they eliminate constraints imposed by the existence of living cells. For instance, unlike traditional cell cultures, they do not need any monitoring, cultivating, or other interventions aimed at preservation, nor are they susceptible to issues of cell viability, growth limits, or stress responses. Similarly, since the cell-free apparatus exists outside of the context of a cellular platform, there are no cell-membrane barriers, facilitating access to biochemical reactions, while, at the same time, there is no interference or competition from other metabolic procedures or regulatory signals, enabling all the available resources to be channeled towards the synthesis of the desired protein. The absence of living cells can be translated into abolishing the need for cloning and cellular transformation as well, which, in turn, ensures safer handling, as no genetically modified organisms are involved in cell-free protein production. More generally, one of the method’s most significant advantages is that it is a highly efficient technique for rapid protein synthesis that can also withstand being transferred across larger distances for longer periods of time, as the entire system can be easily freeze-dried and stored for later use.Hugoen