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Coot: model-building tools for molecular graphics

Acta Cryst. (2004). D60, 2126–2132 [doi:10.1107/S0907444904019158]

[a coot]
Coot is a new CCP4-friendly molecular graphics program for crystallographic model-building. It is built on a range of free software libraries, including Eugene Krissinel’s 'mmdb' and Kevin Cowtan’s 'Clipper'. An intuitive, modern user interface was an important design consideration. Coot currently provides functionality useful for both experienced and novice crystallographers, including rigid body refinement, interactive real space refinement using modified conjugate gradient (BFGS) minimization, 'continuous crystal' electron density and skeleton, interactive Ramachandran plots, NCS density comparison and other model-building and validation tools.

P. Emsley and K. Cowtan