Dynamics aspects of long distance functional interactions between membrane-bound enzymes

Area of Science:

• Biochemistry
• Physical Chemistry
• Supramolecular Chemistry

Background:

• Enzyme activity can be modulated by the surrounding microenvironment.
• Charged milieu, such as cell membranes, presents a unique environment for enzyme function.
• Long-distance interactions between enzymes are crucial for complex biological processes.

Purpose of the Study:

• To investigate how an organized charged milieu (e.g., a membrane) affects long-distance interactions between bound enzymes.
• To determine if enzyme response depends on the spatial order of charges and enzyme molecules.
• To explore if electric interactions can induce hysteresis and oscillations in substrate concentration at membrane surfaces.

Main Methods:

• Theoretical analysis of enzyme-membrane interactions.
• Modeling of electrostatic effects on enzyme kinetics.
• Review of existing experimental data on membrane-bound enzyme systems.

Main Results:

• Enzyme response is influenced by the spatial arrangement of fixed charges and enzyme molecules.
• Electric interactions between charged matrices and substrates can lead to hysteresis loops in substrate concentration.
• Oscillations in substrate concentration at membrane surfaces are observed due to these electric interactions.

Conclusions:

• Observed effects (hysteresis, oscillations) are not intrinsic enzyme properties but arise from enzyme-membrane electric interactions.
• These phenomena highlight the role of supramolecular organization in modulating enzyme function.
• Membrane-bound enzyme systems can function as devices for storing information from the external environment.