[Chimera-users] problems loading .mtz files

Terry Lang terry at lego.berkeley.edu
Tue Aug 24 14:31:09 PDT 2010

  Dear Rakesh,

         Chimera is not able to read mtz files directly.  You need to 
convert the mtz file into a ccp4 or XPLOR map format using a program 
like fft (distributed with the CCP4 suite).  Then Chimera should be able 
to read it in.  You may also want to ask for the feature to be added :O)


On 8/24/2010 2:27 PM, Elaine Meng wrote:
> Hi Rakesh,
> Our volume expert is away right now, but I would suggest using the "Help... Report a Bug" dialog
> and attaching an example of a file needed to reproduce this problem.  It may be that these files
> do not adhere to the MRC format, or at least as Chimera expects it.
> Please include your email address in the bugreport if you wish feedback when someone is able
> to look at this in more detail.
> I see a note in the documentation
> <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volumeviewer.html#mrcout>
> that MRC files output by Chimera are in MRC 2000 format, and
> "Older MRC-reading programs or programs expecting CCP4 format will read such files
> successfully but may not align the data correctly with other data sets."
> However, I don't know specifically what subtypes of MRC format are handled on input, or if
> some simple editing could solve the problem.
> Sorry I don't know more,
> Elaine
> ----------
> Elaine C. Meng, Ph.D.
> UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
> Department of Pharmaceutical Chemistry
> University of California, San Francisco
> On Aug 24, 2010, at 1:45 PM, rjoshi at purdue.edu wrote:
>> Hi,
>> i am having problems loading electron density files from CCP4 and Phenix. The
>> error message reads "Bad MRC grid size (129737328,-319356160,1145110528)". Please
>> advise.
>> Cheers
>> Rakesh
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PaulaTherese Lang
Postdoctoral Scholar
Alber Lab, UC Berkeley

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