title: Small angle X-ray scattering study of S100 proteins.
abstract: Small-angle X-ray scattering of both S100b and a mixture of S100a and S100ao (S100a,ao) was measured over a protein concentration range of 1.5 to 10.0 mg/ml. The addition of trifluoroperazine (TFP) to S100 solutions suppressed higher aggregation under the conditions studied. In the presence of TFP (1 mol TFP/mol of protein dimer), the radius of gyration of S100b and S100a,ao is found to be 19.5 +/- 0.3A and 20.2 +/- 0.3A, respectively, indicating that most S100 proteins may exist as dimers under the conditions studied. The observed difference (0.7 +/- 0.3A) in the radius of gyration between S100b and S100a,ao indicates that these dimers have different, asymmetrical shapes.
authors.affiliation: Department of Chemistry, Hokkaido University of Education, Asahikawa, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Matsuda
authors.forename: Y
authors.initials: Y
authors.lastname: Izumi
authors.forename: N
authors.initials: N
authors.lastname: Matsushima
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D002417:Cattle; D002746:Chlorpromazine / Q000378:metabolism; D011108:Polymers; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D009418:S100 Proteins / Q000737:chemistry* / Q000378:metabolism; D017356:Synchrotrons; D014268:Trifluoperazine / Q000378:metabolism
chemical_list: D011108:Polymers; D009418:S100 Proteins; D014268:Trifluoperazine; D002746:Chlorpromazine