Current developments in Coot for macromolecular model building of Electron Cryo-microscopy and Crystallographic Data

Area of Science:

• Structural biology
• Biochemistry
• Computational biology

Background:

• Coot is a standard tool for macromolecular structure model building, refinement, and validation.
• Recent advancements in cryo-electron microscopy (cryo-EM) yield structures at resolutions (2.5–4 Å) requiring efficient model-building tools.

Purpose of the Study:

• To present the latest advancements and state-of-the-art usage of Coot for macromolecular structure analysis.
• To simplify and accelerate the model building process, particularly for cryo-EM data.
• To reduce the level of expertise required for effective structure refinement.

Main Methods:

• Introduction of new tools within Coot, including morphing and Geman-McClure restraints.
• Implementation of full-chain refinement capabilities.
• Development of Fourier-model based residue-type-specific Ramachandran restraints.

Main Results:

• Coot now offers enhanced capabilities for model building and refinement in macromolecular crystallography and cryo-EM.
• New tools streamline the process of building models into low-resolution cryo-EM maps.
• Improved restraints and refinement options enhance model accuracy and validation.

Conclusions:

• The latest version of Coot provides powerful, user-friendly tools for macromolecular structure determination.
• These Coot enhancements facilitate more accessible and efficient structural biology research.
• The ongoing development of Coot supports the increasing demand for high-resolution structural data from cryo-EM.