The structure of a monoclinic form of bovine pancreatic trypsin inhibitor (BPTI) crystallized from a thiocyanate solution has been determined and refined at 2.7 A resolution. The space group is P21 with a = 71.56, b = 73.83, c = 64.47 A, beta = 93.9 degrees and Z = 20 ...
The structure of a monoclinic form of bovine pancreatic trypsin inhibitor (BPTI) crystallized from a thiocyanate solution has been determined and refined at 2.7 A resolution. The space group is P21 with a = 71.56, b = 73.83, c = 64.47 A, beta = 93.9 degrees and Z = 20. The ten independent molecules were located by a multi-body molecular-replacement search as developed in the AMoRe program, starting from a single monomer model (PDB code: 6PTI). The molecular arrangement of the subunits is a decamer resulting from the combination of two orthogonal fivefold and twofold non-crystallographic axes. This builds a globular micelle-like particle which minimizes hydrophobic interactions with the solvent. The refinement was conducted with non-crystallographic symmetry constraints up to a final residual of R = 0.20 (Rfree= 0.26). The root-mean-square deviations from ideal geometry were 0.015 A and 1.6 degrees on bond distances and bond angles, respectively. Several sites for thiocyanate ions were analyzed.
Related Citations:
Comparison of Solubilities and Molecular Interactions of Bpti Molecules Giving Different Polymorphs Lafont, S., Veesler, S., Astier, J.P., Boistelle, R. (1997) J Cryst Growth 173: 132
Structure of Hexagonal Turkey Egg-White Lysozyme at 1.65 A Resolution Howell, P.L. (1995) Acta Crystallogr D Biol Crystallogr 51: 654
Structure Determination of a Dimeric Form of Erabutoxin-B, Crystallized from a Thiocyanate Solution Saludjian, P., Prange, T., Navaza, J., Menez, R., Guilloteau, J.P., Ries-Kautt, M., Ducruix, A. (1992) Acta Crystallogr B 48: 520
Comparison of Two Highly Refined Structures of Bovine Pancreatic Trypsin Inhibitor Wlodawer, A., Deisenhofer, J., Huber, R. (1987) J Mol Biol 193: 145
Organizational Affiliation:
Laboratoire pour l'Utilisation du Rayonnement Electromagnétique (LURE), Bâtiment 209d, Université Paris-Sud, 91405 Orsay CEDEX, France.
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