Transmembrane signal transduction by cofactor transport

Area of Science:

• Biochemistry
• Synthetic Biology
• Chemical Engineering

Background:

• Biological information processing relies on chemical signaling across lipid membranes.
• Synthetic systems for transmembrane signaling and catalysis are limited.
• Developing artificial systems for cell-like communication is a key challenge.

Purpose of the Study:

• To engineer a synthetic transducer for transmembrane signal transduction.
• To achieve catalytic activity within lipid vesicles triggered by external stimuli.
• To create a controllable and modular synthetic signaling system.

Main Methods:

• A synthetic transducer was designed to bind and transport metal ions across lipid bilayers.
• Catalytic hydrolysis of an ester substrate was initiated inside vesicles upon metal ion binding.
• The system's activity was modulated via metal ion input and covalent conjugation.

Main Results:

• The synthetic transducer successfully transported metal ions, triggering internal catalytic hydrolysis.
• The system demonstrated reversible on/off switching using cadmium(II) and ethylene diamine tetracarboxylic acid.
• Covalent conjugation with pyridine derivatives enhanced transducer activity, while sugar derivatives abolished it.

Conclusions:

• Coupling transmembrane transport with intracellular catalysis provides a robust signaling mechanism.
• The synthetic transducer offers a versatile platform for building complex, responsive chemical systems.
• This work advances the development of artificial systems for information processing and cell signaling.