Topic: bacillus subtilis

Jennifer Brophy presents two methods for programming when and where genes are expressed in plants and their associated microbes. One creates a chemical signal using the noncanonical amino acid O-methyl-L-tyrosine. Engineered Arabidopsis, tomato and poplar produce the signal, while engineered Bacillus subtilis and soil bacteria respond by activating gene expression. Restricting signal production to selected plant tissues allows local control of microbial activity. The second approach builds a genetic circuit that counts successive branching events in roots. It produces different expression pat

Chemotaxis is the process where cells move in response to external chemical gradients. It has mainly been viewed as a foraging and defense mechanism, enabling bacteria to move towards nutrients or away from toxins. We recently found that the Gram-positive bacterium Bacillus subtilis performs chemotaxis towards DNA. While DNA can serve as a nutrient for B. subtilis, our results suggest that the response is not to DNA itself but rather to the information encoded within the DNA. In particular, we found that B. subtilis prefers DNA from more closely related species. These results suggest that B. s