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2020 - Design of Protein Logic Gate System Operating on Lipid Membranes

 icon vpp   Vesicle Prep Pro Publication in ACS Synth. Biol. (2020)

Authors:
Omersa N., Aden S., Kisovec M., Podobnik M., Anderluh G.

Journal:
ACS Synth. Biol. (2020) https://doi.org/10.1021/acssynbio.9b00340


Abstract:

Lipid membranes are becoming increasingly popular in synthetic biology due to their biophysical properties and crucial role in communication between different compartments. Several alluring protein–membrane sensors have already been developed, whereas protein logic gates designs on membrane-embedded proteins are very limited. Here we demonstrate the construction of a two-level protein–membrane logic gate with an OR-AND logic. The system consists of an engineered pH-dependent pore-forming protein listeriolysin O and its DARPin-based inhibitor, conjugated to a lipid vesicle membrane. The gate responds to low pH and removal of the inhibitor from the membrane either by switching to a reducing environment, protease cleavage, or any other signal depending on the conjugation chemistry used for inhibitor attachment to the membrane. This unique protein logic gate vesicle system advances generic sensing and actuator platforms used in synthetic biology and could be utilized in drug delivery.

 


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