[Chimera-users] Generated density maps

Tom Goddard goddard at cgl.ucsf.edu
Wed Dec 10 12:10:51 PST 2008

Hi Maya,

  Chimera does not write CCP4 format.  I am surprised that Coot does not 
read the MRC map.  Does it give an error message?  Have you tried 
changing the file suffix to whatever Coot expects (.map?).  The 
differences between MRC and CCP4 format are very small and usually do 
not prevent these file types being read interchangably.


maya shcushan wrote:
> Dear Tom,
> Indeed, the program Coot cannot open the .mrc map that Chimera produced.
> Since Chimera can deal with both .mrc and .ccp4, I guess you have some
> function inside Chimera that can convert the formats. Still, chimera allows
> to doesn't allow to save in .ccp4 format.
> The point is I need it in the .ccp4 format. Can something implanted in
> Chimera do that for me?
> Thanks,
> Best,
> Maya
> -----Original Message-----
> From: Tom Goddard [mailto:goddard at cgl.ucsf.edu] 
> Sent: Wednesday, December 10, 2008 7:45 PM
> To: maya shcushan
> Cc: chimera-users at cgl.ucsf.edu
> Subject: Re: [Chimera-users] Generated density maps
> Hi Maya,
>   The MRC format is almost identical to the CCP4 map format.  Most 
> software that expects a CCP4 map will have no trouble reading an MRC 
> map.   The main difference is in how they specify the positioning of the 
> map.  The MRC map written by Chimera may not align with the PDB if 
> opened in a program that is expecting a CCP4 map.  (I suspect it will 
> align in most other programs.)
>     Tom
> maya shcushan wrote:
>> Hello,
>> I generated a density map of 8A resolution from a PDB file. I would 
>> like to save the map in CCP4 format, but Chimera only allows me to 
>> save it in  .mrc, .nc, .cmap and .brix format.  IS there any way to 
>> save it in .ccp4 format, supported by chimer?
>> Thanks,
>> Best,
>> Maya Shuchsan, Tel-Aviv University
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