[phenixbb] NCS in mr_rosetta
Randy Read
rjr27 at cam.ac.uk
Wed May 14 08:49:01 PDT 2014
The MR step in mr_rosetta is carried out by Phaser, which doesn’t have any way to exploit prior knowledge of NCS. It’s one of many things on a very long wish-list of features, but at the moment it’s not near the top of that list. If we hear of enough people who are constrained by the lack of such a feature, that of course will influence the order of the list!
Best wishes,
Randy Read
On 14 May 2014, at 16:10, Terwilliger, Thomas C <terwilliger at lanl.gov> wrote:
> Hi Stefan,
>
> Normally mr_rosetta figures out the NCS from the MR solution itself, as opposed to using anything in the data. It would seem that the MR step should have found 3 copies and then mr_rosetta should have noticed that. I wonder if somehow the MR step didn't find multiple copies?
>
> All the best,
> Tom T
>
> On May 14, 2014, at 7:13 AM, Stefan Knight wrote:
>
>> Hi,
>>
>> Is there some way to make mr_rosetta use information about NCS present in the data? I have data from a crystal in sg P21 with a clear 3-fold axis perpendicular to the two-fold screw (as seen in self rotation function), and most likely 6 molecules in the asymmetric unit, but none of the mr_rosetta solutions that have appeared so far show 3-fold symmetry, and it doesn’t seem like the ncs is used in the search. The only info about ncs in mr_rosetta I have been able to find online pertains to extracting NCS from search models or mr_rosetta assembled models.
>>
>> Thanks,
>> Stefan
>>
>> -------------------------------------------------------------------------------------------------------
>> Stefan D. Knight, PhD
>> Professor of Biology
>> Department of Cell and Molecular Biology, Uppsala University
>> Uppsala Biomedical Centre, P.O. Box 596, S-751 24 Uppsala
>> Sweden
>>
>> Voice: +46 (0)18 471 45 54
>> Fax: +46 (0)18 53 03 96
>> E-mail: stefan at xray.bmc.uu.se
>>
>> -------------------------------------------------------------------------------------------------------
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>>
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------
Randy J. Read
Department of Haematology, University of Cambridge
Cambridge Institute for Medical Research Tel: + 44 1223 336500
Wellcome Trust/MRC Building Fax: + 44 1223 336827
Hills Road E-mail: rjr27 at cam.ac.uk
Cambridge CB2 0XY, U.K. www-structmed.cimr.cam.ac.uk
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