In Vitro Application of Langmuir Monolayer Model: The interfacial Behavior of Myelin Basic Protein with a Plasma
Lei Zhang1, Xiao Tian2, Chenchen Wang2
1Department of Experimental Teaching Center for Optoelectronic Science and Information Engineering, Xi'an Aeronautical Institute, Xi'an, 710077, Shaanxi, China. 15229244102@163.com.
Abstract:
The stability and compactness of myelin structure and brain homeostasis depend on MBP and glial cell plasma membrane interactions. In order to get more detailed mechanisms of this interaction, the MBP of different concentrations interacting with plasma membrane (POPC/POPE/POPS/Cholesterol (Chol)) model to form bionic membrane was studied by atomic force microscopy (AFM) and Langmuir monolayer technology. The surface pressure(π)-area(A) curve is analyzed by the elastic modulus ([Formula: see text]) and two-dimensional virial equation of state (2D-VES), and the second virial coefficient of the interaction between MBP and plasma membrane molecules was calculated. (i) According to two-dimensional virial equation, it could be analyzed that with the increase of MBP concentration in the subphase, the value of the second virial coefficient increases also, which indicates that MBP is absorbed into lipid membrane of the plasma membrane model at low surface pressure and that the interaction between the molecules is spatial repulsive force, and (ii) in the monolayers with MBP, resulting in an increasing mean molecular area and monolayer stability due to hydrophobic and electrostatic interactions between the positively charged MBP with hydrophobic residues and negatively charged POPS and neutral lipid (POPC, POPE). AFM surface topographic results correspond to the results of the curve analysis, indicating that MBP of different concentrations has significant influences on alignment and conformation of plasma membrane, which is of great medical value and biological significance to the application of interaction between MBP and myelin lipid membrane in treatment of central nervous diseases. Adsorption model of interaction between MBP and plasma membrane model.
Insights
Myelin basic protein (MBP) interacts with brain cell membranes, influencing their structure and stability. This study reveals MBP
Area of Science:
- Biophysics
- Neuroscience
- Materials Science
Background:
- Myelin basic protein (MBP) is crucial for myelin structure and brain homeostasis.
- Understanding MBP's interaction with glial cell plasma membranes is key to elucidating disease mechanisms.
Purpose of the Study:
- To investigate the detailed mechanisms of MBP interacting with a model plasma membrane.
- To analyze the effects of varying MBP concentrations on membrane properties.
Main Methods:
- Utilized Langmuir monolayer technology and atomic force microscopy (AFM).
- Analyzed surface pressure-area curves using elastic modulus and the two-dimensional virial equation of state (2D-VES).
- Calculated the second virial coefficient to quantify MBP-membrane interactions.
Main Results:
- MBP adsorption into the lipid membrane model was observed at low surface pressure.
- Increased MBP concentration led to a repulsive force between molecules.
- MBP enhanced monolayer stability and molecular area through hydrophobic and electrostatic interactions.
- AFM confirmed MBP's significant influence on plasma membrane alignment and conformation.
Conclusions:
- MBP significantly alters plasma membrane structure and stability.
- The findings provide insights into MBP-myelin lipid membrane interactions.
- This research holds potential for treating central nervous system diseases.
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