Space groups F23 and P4132 are not subgroups of each other (without invoking pseudotranslational symmetry) so they cannot be related by twinning. The end of theoretical analysis.
Zbyszek Otwinowski > You need to say what the cell dimensions are for these 2 options.. > Eleanor > > On 29 May 2012 15:59, Andrey Lebedev <[email protected]> wrote: > >> Hi Mike. >> >> I would be more careful about "incorrect" space group. Yes, sometimes >> auto-indexing gives strange results. >> However, in your case two sets of crystals differ by two factors, >> diffraction quality and space group. >> Therefore it seems more likely that you have two crystal forms. >> Could you please send me log-files from pointless or ctruncate? Then I >> would be able to say something more definite. >> >> Regards >> >> Andrey >> >> On 28 May 2012, at 08:46, Mike John wrote: >> >> Hi, All, >> >> we got many datasets from crystals of our protein. when the crystal has >> high quality, it will be indexed as F23 (correct space group). While >> diffracting poorer, it will be indexed as incorrect space group P4132. >> The >> crystals are twined. My question is: >> Given twinning, why the correct space group F23 will be indexed as an >> incorrect space group P4132 for most of our crystals (most crystals has >> poorer quality)? Theoretical analysis of twin operator and symmetry >> operator to connect F23 and P4132 would be highly appreciated. Thanks >> >> Mike >> > Zbyszek Otwinowski UT Southwestern Medical Center at Dallas 5323 Harry Hines Blvd. Dallas, TX 75390-8816 Tel. 214-645-6385 Fax. 214-645-6353
