Table 1: Data collection and refinement statistics 2004-07-21809 Data Collection Ro 48-8071 Lanosterol Wavelength (Å) 0.92 0.98 Resolution1 (Å) 20-2.20 (2.26-2.20) 20-2.0 (2.09-2.0) Unique reflections1 60002 (4884) 79898 (9547) Completeness (%)1 98.0 (97.5) 99.2 (96.3) Rmerge (%)1,2 9.9 (37.6) 7.6 (48.9) <I/>1 7.7 (2.5) 14.4 (3.1) Unit Cell (Space group C2221) 189.9 Å 202.4 Å 62.6 Å 189.6 Å 201.5 Å 62.1 Å Refinement Refmac5 autoBUSTER Resolution (Å) 20-2.2 (2.26-2.20) 20-2.1 (2.155-2.10) Rcryst1,3 19.2 (26.2) 14.7 (18.8) Rfree1,4 22.5 (30.2) 18.8 (24.0) Average B-factor (Ų) 38.1 33.5 R.m.s. deviations from ideality Bond 0.01 / 1.1 0.01 / 1.6 92.3 / 6.4 / 0.3 93.3 / 5.9 / 0.3 lengths (Å) / angles (°) Main chain dihedral angles (%) Most favored / allowed / disallowed 5 1 Values in parentheses refer to the highest resolution bins. 2 Rmerge=I-<I>/I where I is intensity. 3 Rcryst=Fo-<Fc>/Fo where Fo is the observed and Fc is the calculated structure factor amplitude. 4 Rfree was calculated based on 5% of the total data omited during refinement. Rfree was not applied during the automated model building step. 5 Calculated with PROCHECK31. In both structures the only residues in the disallowed regions of the ramachandran plot are Glu519 and Lys69 1 31. Laskowski, R.A., MacArthur, M.W., Moss, D.S. & Thornton, J.M. PROCHECK: a program to check the stereochemical quality of protein structure. J. Appl. Crystallogr. 26, 283291 (1993). 2