Good morning, 53 x 2 = 106 79 x 2 = 158
Awfully close to 156 and 105 in the C-group. Are you sure there is no tricky twinning or faulty indexing of some sort - in either of these space group assignments? On the other hand, I have seen two different habits and different spacegroups growing from the same drop. So maybe you are just lucky? Artem www.xtals.org 'crystals the size of cats, *every time*' - Cosmic Cats approve of this message On Fri, Oct 28, 2016 at 9:13 AM, Sam Tang <[email protected]> wrote: > Dear all > > Sorry for going a bit off-topic in this thread. > May I seek your advice as on whether you have experienced that crystals > being obtained from the same droplet, looking alike under microscope (rod > shape) and in fact growing possibly from a same nuclei, give two space > groups after indexing? > > I recently obtain crystals for a protein (co-crystallized with a nucleic > acid ligand) and collected two datasets from synchrotron. Although these > two crystals are from the same drop, the SG and unit cell dimensions are > very different: > > Xtal1: C121 (156 60 105 90 111 90) (L-test, Pointless shows that there is > no twinning), ~2.5 Angstrom > Xtal2: P1 (53 60 79 106 105 98), ~3 Angstorm > > Would it be possible that the ligand changes the SG of the crystal so that > only one of the forms contains the ligand? > > Any advice is appreciated and thanks a lot in advance for your input. > > Regards > > Sam Tang > Biochemistry Programme, School of Life Sciences, CUHK > >
