Re: [ccp4bb] Method to calculate/measure the mean solvent electron density calculated from the crystallization conditions?

2014-02-06 Thread James Holton
We recently published a method for estimating F(000) by simply equating it to Fcalc(000), the sum of all the electrons in the refined model (including those in the bulk solvent): http://dx.doi.org/10.1073/pnas.1302823110 The results of this procedure compared favorably with the two experimen

Re: [ccp4bb] Method to calculate/measure the mean solvent electron density calculated from the crystallization conditions?

2014-02-05 Thread Michael C. Wiener
Starting with the density (or specific volume) of water, you can obtain rho(water)=0.33 e-/A^3. It's a nifty little bit of arithmetic and dimensional analysis. -MW Michael C. Wiener, Ph.D. Professor Department of Molecular Physiology and Biological Physics University of Virginia PO Box 800886

[ccp4bb] Method to calculate/measure the mean solvent electron density calculated from the crystallization conditions?

2014-02-05 Thread Joseph Noel
Dear All, Is there a way or program that is good at providing a solid estimate of F000 using the standard mean protein electron density of 0.433 e/A**3 and a mean solvent electron density calculated from the crystallization conditions? I am wondering how the latter might affect F000 if the con