From: Fred Berkovitch <fredb@MIT.EDU> - 2004-01-06 02:27:13
For some reason, I can't contour my CCP4 map (generated with Solve/Resolve)
around a ligand in my structure. I know there's electron density around my
ligand, because I can see it in O (convert the CCP4 map to an omap) or
XtalView (convert the ccp4 map to fsfour).
I used the old CCP4 program "extend" to cover the entire unit cell (XYZLIM
0.0 1.0 0.0 1.0 0.0 1.0), but I still can't see any electron density beyond
some random border in my unit cell. A huge volume in my unit cell isn't
covered by electron density!
I thought, perhaps, that I should calculate the electron density in the
previous unit cell as well ( XYZLIM -1.0 1.0 -1.0 1.0 -1.0 1.0), but no luck.
Anyone seen this before? How do I fix this?