New model explains how bacterial promoter elements set gene activity and regulation
Bacterial promoters are DNA sequences that recruit RNA polymerase to initiate transcription, primarily through two elements called −10 and −35. However, the contributions of these elements to promoter evolution and regulation have remained unclear.
This study published in Nature Communications reveals how bacterial promoter elements, specifically −10 and −35 sequences, set gene activity and regulation. Researchers at National Taiwan University generated a vast library of promoter combinations in E. coli and used biophysical modeling to understand their roles. They found that the −10 element serves as an ON/OFF switch, activating transcription when present in an appropriate sequence, while the −35 element controls expression strength, much like a volume tuner.
The study also discovered a surprising trade-off: while increased basal transcription leads to higher regulatory fold change, this relationship peaks at intermediate levels of basal activity, contrasting with a previous Science study. This new understanding of core promoter sequences as crucial design elements in synthetic biology also highlights the need for comprehensive data coverage to prevent misinterpretations in systems biology.
Written by urgent.news from Phys.org's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
