I think that starting with a direct methods program like shelxt would be fun. If that doesn’t work, it could be interesting to try to solve it by molecular replacement with fragments varying from a tetraplex, a base pair or even just single bases. (Assuming that Phoebe’s concern about twinning does not turn out to be correct…)
Best wishes,
Randy Read
-----
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: [log in to unmask]
Cambridge CB2 0XY, U.K. www-structmed.cimr.cam.ac.uk
> On 20 Apr 2018, at 20:09, Tim Gruene <[log in to unmask]> wrote:
>
> Dear Rafal,
>
> shelxt does not require the space group, it only needs the Laue group. If it
> finds a decent solution, it'll find also the space group for you.
>
> Best,
> Tim
>
> On Friday, April 20, 2018 3:30:36 PM CEST Rafal Dolot wrote:
>> Dear CCP4BB,
>>
>> I've recently collected data for 11mer build of DNA (9xG, 2xT). XDS, and
>> DIALS gave me similar solution - SG: I2(1)2(1)2(1) or I222, with cell
>> dimension 20.65, 22.96, 43.37, 90, 90, 90, what is too small for this
>> size of the molecule. 11mer is rich in G, so we expect the G-tetraplex
>> formation. Data were collected to almost 1 A, so it should be enough for
>> trials with direct methods/ab initio solution. What I should do first to
>> find correct SG and/or cell parameters?
>>
>> Best regards,
>>
>> Rafal
>
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> --
> Paul Scherrer Institut
> Tim Gruene
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> OSUA/204
> CH-5232 Villigen PSI
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