title: Three-dimensional structure of Escherichia coli thioredoxin-S2 to 2.8 A resolution.
abstract: The three-dimensional structure of the electron transport protein thioredoxin-S2 from E. coli has been determined from a 2.8 A resolution electron density map. The molecule is built up of a central core of three parallel and two antiparallel strands of pleated sheet surrounded by four helices. Thr residues involved in the active center 14-membered disulfide ring of thioredoxin form a protrusion between one of the helices and the middle strand of the pleated sheet. This region of the molecule, comprising two parallel strands joined by the protrusion and a helix, is structurally very similar to corresponding functionally important regions in the nucleotide-binding domains of flavodoxin and the dehydrogenases. The molecule has about 75% of the residues in well-defined secondary structures. The structure indicates that the carboxy-terminal third of the molecule forms an independent folding unit consisting of two strands of antiparallel pleated sheet and a terminal alpha-helix. This agress with the noncovalent reconstitution experiments from thioredoxin peptide fragments. Thioredoxin is an example of a protein with the active center located on a protrusion rather than in a cleft, thus demonstrating the existence of male proteins.
mesh_terms: D001426:Bacterial Proteins / Q000032:analysis*; D001665:Binding Sites; D004220:Disulfides; D004926:Escherichia coli / Q000032:analysis*; D011487:Protein Conformation; D013879:Thioredoxins / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D001426:Bacterial Proteins; D004220:Disulfides; D013879:Thioredoxins