Hello all,
I just solved a NCS-tetrameric (biological assembly is just a dimer) crystal structures with ligand soak (same plate - same conditions). No density for ligand is observed in the first map. In the 2nd, I have 1 ligand bound. In the 3rd, I have 2 ligands bound. Is there any reason for this 'random' behaviour?
In addition, I observed just one crystal out of 20 gave a different unit cell. Pointless confirms to me
"Best Solution: space group C 2 2 2". REFMAC refinement shows R/Rfree ~ 20/25 %
Cell from mtz : 216.5 345.8 145.2 90.0 90.0 90.0
Space group from mtz: number - 21; name - C 2 2 2
All other datasets have:
Cell from mtz : 147.0 354.3 217.4 90.0 90.0 90.0
Space group from mtz: number - 20; name - C 2 2 21
I tried re-processing/refining the C2221 dataset in C222 but R/Rfree stays ~45%. Can I also consider the C2221 dataset as a 'different crystal form'?
