Version 1.2 of the Crystallography and NMR system

• Published in: Nature protocols Vol. 2; no. 11; pp. 2728 - 2733
• Main Author: Brunger, Axel T
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.11.2007; Nature Publishing Group
• Subjects: Algorithms; Analytical Chemistry; Applications software; Biochemistry - methods; Biological Techniques; Biomedical and Life Sciences; Computational Biology - methods; Computational Biology/Bioinformatics; Computer Simulation; Crystal lattices; Crystallography; Crystallography, X-Ray; Language; Life Sciences; Microarrays; Models, Molecular; NMR; Nuclear magnetic resonance; Nuclear magnetic resonance spectroscopy; Nuclear Magnetic Resonance, Biomolecular; Optimization; Organic Chemistry; protocol; Software; Solvents; United States
• ISSN: 1754-2189; 1750-2799; 1750-2799
• DOI: 10.1038/nprot.2007.406

Version 1.2 of the software system, termed Crystallography and NMR system (CNS), for crystallographic and NMR structure determination has been released. Since its first release, the goals of CNS have been (i) to create a flexible computational framework for exploration of new approaches to structure determination, (ii) to provide tools for structure solution of difficult or large structures, (iii) to develop models for analyzing structural and dynamical properties of macromolecules and (iv) to integrate all sources of information into all stages of the structure determination process. Version 1.2 includes an improved model for the treatment of disordered solvent for crystallographic refinement that employs a combined grid search and least-squares optimization of the bulk solvent model parameters. The method is more robust than previous implementations, especially at lower resolution, generally resulting in lower R values. Other advances include the ability to apply thermal factor sharpening to electron density maps. Consistent with the modular design of CNS, these additions and changes were implemented in the high-level computing language of CNS.