Hi Murpholino,

reasons are similar to why crystallographic R factor never goes to zero.

Model-map CC is calculated between the map (the data, in case of cryo EM, or sort of data in case of Crystallography) and a model. As you know data always has errors and model is just an approximation to reality. So you have no chance to match them perfectly, unless overfit. Something along these lines..

Pavel

On 6/14/19 12:42, Murpholino Peligro wrote:
The links below show a plot of the results of phenix.real_space_correlation* for a nice lisozyme crystal and also the coot view.
https://drive.google.com/open?id=0B9tqXyDsq9YIdkRhcVFXU2dEdnhINXR6Y3hza2Y5NGpNM1hV
https://drive.google.com/open?id=0B9tqXyDsq9YIREd1OFZhNGZtRnN4aldtVU1mdk84NExVX2Vn

As you can see the electron density fits very well the model.
Why not a single residue gets a perfect correlation coefficient? (i.e. 1)


Just curious.

Thanks


* phenix.real_space_correlation pdbfile mtzfile --detail="residue" > outpu

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