JISCMail - CCP4BB Archives

to get feeling about how maps may look like at different resolutions do the following learning exercise: download a structure from PDB and compute Fcalc maps at different resolutions:

phenix.fmodel model.pdb high_res=1
phenix.fmodel model.pdb high_res=2

phenix.fmodel model.pdb high_res=3
phenix.fmodel model.pdb high_res=4

phenix.fmodel model.pdb high_res=5
...
phenix.fmodel model.pdb high_res=10

phenix.fmodel model.pdb high_res=20

then load them in Coot and you will get your answer.

But fake data will always look much better than real data - to start with, the B-factors will be all wrong.

There are actually a handful of PDB entries that are between 8.0 and 12.0 and have experimental data deposited:

1H1K, 1PNS, 1PNX, 1VCR,1ZBB, 2QIJ, 2QZV, 3LVH, 3PCQ

and 1VOQ, 1VOR, 1VOS, 1VOU, 1VOV, 1VOW, 1VOX, 1VOY, 1VOZ, 1VP0, which are all the same structure split over multiple files.

I'd suggest downloading a few of these and looking at the maps.

-Nat