Hi
If you want to integrate anisotropically, Mosflm has allowed it since
late in the last Century.
However, the last time I mentioned it to Garib he said that he'd prefer
to have the data integrated isotropically (even the data that "aren't
there becasue they're too weak").
On 22 Nov 2007, at 13:43, Kay Diederichs wrote:
> Pierre Barraud schrieb:
>> Dear all,
>> I am working on a data set which is severely anisotropic, with
>> diffraction limits of 2.6 A along the a* and b* direction but only
>> 3.3 A along the c* direction. I attached a screen shot of the
>> Anisotropic analysis (FALLOFF) output graph from SCALA.
>> My question is : what is the best strategy (or what are the different
>> strategies) in the structure resolution process (from image
>> integration to refinement) to make use of the maximum high resolution
>> information ? Actually, I am a little disorientated by the
>> informations I have collected.
>> Best regards,
>> Pierre
>
> Pierre,
>
> as you found, data integration is not harmed by anisotropy.
>
> The relevant programs for structure solution and refinement (e.g.
> sharp, molrep, phaser, refmac etc.) deal explicitly with anisotropy; I
> don't think there there is a compelling need to do something fancy.
> Others will correct me.
>
> If you _do_ want an anisotropic resolution cutoff, you could use
> sftools. Load all your data (i.e. up to 2.6A) into sftools. Then
> multiply the length of the c axis by a factor of 2.6/3.3 , and let
> sftools delete all those reflections that are beyond 2.6A now. Then
> restore the original c axis and write out the remaining data.
>
> HTH,
>
> Kay
> --
> Kay Diederichs http://strucbio.biologie.uni-konstanz.de
> email: [log in to unmask] Tel +49 7531 88 4049 Fax 3183
> Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz
>
Harry
--
Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre, Hills
Road, Cambridge, CB2 2QH
|