Figure 6
Irradiated crystal volume (Vcryst) scaled against scattering power (S) for a selected high-resolution single-crystal microdiffraction experiment (adapted from Riekel et al., 2005 ). The scattering power has been scaled to an average electron density: S = (F000/Vcell)2 × λ3 × V32cryst, where F000 is the zero-order structure factor, Vcell is the unit-cell volume, λ is the wavelength and Vcryst is the crystal volume. For experiments with a beam size smaller than the crystal size, Vcryst corresponds to the irradiated volume during a single exposure. The shaded zone indicates the previously predicted crystal-volume limit for protein crystallography. Open squares represent inorganic structures: 1, CaF2 (Burghammer, 1997 ); 2, kaolimite (Neder et al., 1996 ); 3, birnessite (Gaillot et al., 2003 ). Filled diamonds represent protein crystals: X, xylanase II; 4, rhodopsin (Li et al., 2004 ); 5, α-amylose (Popov et al., 2006 ); 6, amyloid-like fibrils (Nelson et al., 2005 ); 7, sensory rhodopsin II (Luecke et al., 2001 ); 8, bacteriorhodopsin (Pebay-Peyroula et al., 1997 ); 9, HIV-1 capsid protein (p24; Berthet-Colominas et al., 1999 ); 10: integrin α2β1-binding collagen peptide (Emsley et al., 2004 ). |