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I was surprised when I compared the high-resolution structures of lysozyme grown in three different space groups. The overall backbone RMSD were 0.7A. This seems large to me, I remember reading somewhere that 0.25A was more typical of identical proteins grown by different groups under different conditions. Is anyone aware of a systematic comparison of identical proteins in different space groups?
When looking for small changes in protein structure induced by ligand binding, one should ideally compare like space groups, but that is often not possible. The case is strengthened when similar changes are seen in different space groups. Does anyone have advice to offer on how to separate packing effects from true ligand-induced changes in ambiguous cases?
Richard Gillilan MacCHESS
