MAPMAN contains several related options, e.g. CEll, SPacegroup, TRanslate and
GTranslate, PAste (see the manual for caveats -
http://xray.bmc.uu.se/usf/mapman_man.html ). Saving as an ASCII file and
editing may also work, if you know what you are doing.
--Gerard
On Tue, 20 May 2014, Edward A. Berry wrote:
> But, if you convert to structure factors and recalculate the map in a
> different cell,
> the features will be "stretched" to fill the cell, which I take it is the
> original problem.
>
> I found Kleywegt's RAVE package very convenient for doing this,
> but i believe the functionality is now available in
> ccp4 mapmask and maprot programs.
>
> The Phaser Wiki has a page with instructions
> for cutting out electron density within a mask,
> and putting it in a large P1 cell for use as a molecular
> replacement model. Perhaps you could modify that to achieve
> your aims.
>
> http://www.phaser.cimr.cam.ac.uk/index.php/Using_Electron_Density_as_a_Model
> eab
>
> On 05/20/2014 03:07 AM, [log in to unmask] wrote:
>> Dear Niu,
>>
>> Provided you have a complete asymmetric unit (unit cell in P1), you could
>> also convert this map to
>> structure factors and manipulate those, e.g. with sftools. To calculate
>> structure factors you could use
>> sfall and also clipper has utilities to convert a map to structure factors.
>>
>> Best,
>>
>> Herman
>>
>> *Von:*CCP4 bulletin board [mailto:[log in to unmask]] *Im Auftrag von
>> *Niu Tou
>> *Gesendet:* Montag, 19. Mai 2014 23:25
>> *An:* [log in to unmask]
>> *Betreff:* [ccp4bb] map manipulation questions
>>
>> Dear All,
>>
>> I have a ccp4 format map file in P1 spacegroup, I would like to manipulate
>> it in several ways:
>>
>> 1. enlarge the cell dimension . When I tried "CELL" keyword in MAPMAN, the
>> density scaled up together
>> with the cell dimension. Does anybody know how to do it without changing
>> the density?
>>
>> 2. Change the space group to P2.
>>
>> 3. Move the density away from its original place, i.e. apply a
>> translocation vector to it.
>>
>> Does anybody know the answers? Thanks in advance!
>>
>> Regards,
>>
>> Niu
>>
>
Best wishes,
--Gerard
******************************************************************
Gerard J. Kleywegt
http://xray.bmc.uu.se/gerard mailto:[log in to unmask]
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Little known gastromathematical curiosity: let "z" be the
radius and "a" the thickness of a pizza. Then the volume
of that pizza is equal to pi*z*z*a !
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