Beyond Plug and Pray: Context Sensitivity and in silico Design of Artificial Neomycin Riboswitches

Area of Science:

• Molecular Biology
• Synthetic Biology
• Computational Biology

Background:

• Gene regulation in prokaryotes relies on RNA elements like riboswitches in the 5' untranslated region of mRNA.
• Structural rearrangements in response to small molecules or ions control gene expression by affecting translation or transcription.
• Computational modeling enables rational design of synthetic riboswitches.

Purpose of the Study:

• To construct the first synthetic transcriptional riboswitches responsive to the antibiotic neomycin.
• To investigate the influence of sequence context on riboswitch behavior in vivo.
• To develop in silico methods for predicting and optimizing riboswitch design.

Main Methods:

• Design of synthetic riboswitches using an artificial aptamer.
• In vivo characterization of neomycin riboswitch activity.
• Development of computational models to predict sequence context effects.
• Analysis of 5' hairpin stability on riboswitch function.

Main Results:

• Successfully constructed synthetic transcriptional riboswitches responding to neomycin.
• Demonstrated that sequence context significantly impacts in vivo riboswitch switching behavior.
• Developed and validated in silico methods to predict and adapt riboswitch design.
• Identified the influence of 5' hairpin stability on neomycin riboswitch activity.

Conclusions:

• Synthetic riboswitch function is highly dependent on sequence context, challenging simple plug-and-play designs.
• Computational models significantly enhance the design, improvement, and automation of transcriptional circuits.
• The developed design software aids in creating functional synthetic genetic elements.