MPBuilder: A PyMOL Plugin for Building and Refinement of Solubilized Membrane Proteins Against Small Angle X-ray...

Area of Science:

• Structural biology
• Biophysics
• Computational biology

Background:

• Membrane proteins (MPs) are crucial targets in biological, medical, and pharmaceutical research.
• High-throughput structural analysis of MPs and their ligand interactions is challenging, often requiring extensive experimental efforts.
• Existing methods for MP structural studies are often labor-intensive and may require significant sample preparation.

Purpose of the Study:

• To introduce MPBuilder, a user-friendly tool for generating and refining all-atom models of membrane protein complexes.
• To facilitate the structural analysis of membrane proteins in various solution environments using small-angle X-ray scattering (SAXS).
• To bridge the gap between experimental SAXS data and computational modeling for membrane protein systems.

Main Methods:

• Development of MPBuilder, a versatile tool integrated with the PyMOL molecular visualization system.
• MPBuilder enables the construction of models for protein-detergent, bicelle, and lipid-scaffold (nanodisc) complexes.
• Integration with ATSAS software package for model refinement and validation against experimental SAXS data.

Main Results:

• MPBuilder provides a simplified workflow for generating complex membrane protein models.
• The tool supports the creation of models relevant for SAXS-based structural studies.
• MPBuilder facilitates the refinement and validation of these models against experimental scattering data.

Conclusions:

• MPBuilder offers a robust and accessible solution for computational modeling of membrane protein systems.
• The tool enhances the efficiency of structural studies on membrane proteins, particularly when combined with SAXS.
• MPBuilder empowers researchers to investigate membrane protein structures and conformational changes in solution.