https://pages.htgaa.org/2026b/luisa-itzel-olivas-evangelista/week-03-hw-cell-free-protocols/index.htmlWhy does the concentration of potassium glutamate and magnesium glutamate differ between compositions? Which is more sensitive? These components must be readjusted every time other components of the reactions change. They differ because both ions have to be re-tuned whenever something else in the reaction changes, so there is no single “right” value. Potassium glutamate (K-Glu) is there to mimic the cation balance of the E. coli cytoplasm. Glutamate is the preferred anion because protein-nucleic acid interactions are more favorable in glutamate than in acetate (Jewett & Swartz). The optimum depends on the formulation: In Jewett & Swartz, it is 175 mM for PANOx-SP and 130 mM for Cytomim. In Olsen et al. (Table 1), it ranges from about 80 mM in some published formulations up to 300 mM in their minimal formulation and 362 mM in the optimized one (RFopt).Hugoen