This is presumably the issue of map asymmetric unit.
Unlike some older programs, Coot doesn't store a map covering some
predefined volume - say a model. It stores a single unique asymmetric
unit, and generates density for any position in crystal space on the fly
by use of the cell repeat and symmetry (and some fancy optimisation).
When you export the map, you get exactly what coot has - an asymmetric unit.
I'm guessing from your report that Chimera doesn't do the on-the-fly
repeat and symmetry. If that's correct, then you'll need to expand the
map before reading it into Chimera. One tool for doing this is the ccp4
utility 'mapmask' - in ccp4i go to 'Map and Mask Utilities', select
'Edit/Rotate map & mask', and pull down the first menu to pick 'Extend a
map/mask file'. Enter your map and pdb, and you'll get a map out
covering the model to the given radius.
Hope that helps
Kevin
On 07/21/2011 01:50 PM, Joachim wrote:
Hello!
I use wincoot. For reasons of importing an electrod density map into Chimera, I
export the map first form WinCoot:
Extensions>Maps...>Export Map...
However, i find that the exported map(.map) has fixed dimensions although I set
the Map radius to a higher value. This doesn't influence the exported map ,the
filesize is always the same.
Now I cannot see the whole ED map in Chimera. Is there a way to adjust the map
export parameters in WinCoot (or also in a Coot version for Linux)?
Many thanks for suggestions
best regards
Joachim
