Hi Guys -
I am having a very puzzling problem using the new Phenix (1.4-3). I have about 20 structures that I am preparing to deposit with an accepted manuscript, and decided to do a final refine using the phenix.refine_gui not only to see if I got better numbers, but to use the integrated validation tools, which I love. Unfortunately, often, but not always, when I refine the pdb against the *_refine_data.mtz the statistics are a bit worse, and when I open the resulting *.map_coeffs.mtz in Coot it appears to be shifted with tons of negative electron density. Needless to say, this is making my nervous, so I've tried a few things:
1) Tried refining the same .pdb and .mtz files in Refmac - I seem to get the same shifting.
2) Try using the old .def file left over from the final run (just to make sure I didn't screw up some setting) - and I get the same shifting.
3) Try refining against the original .sca file - and I get the same shifting.
4) Try molecular replacement of the refined .pdb against the original .sca file - and sometimes, but not always, get a shift.
I am nervous and concerned - can you help me figure out what happened? I am enclosing an example -
refine_001.pdb = pdb I refined in new phenix
refine_001map_coeffs.mtz = mtz output from new phenix refinement (lots of red)
oste44a_output.sca = original scale file from HKL2000
MR.1_refine_data.mtz = data from which I am refining
sgk_ost_temp_H_refine_004.pdb
Thanks -
Miles