Three-dimensional structure of Escherichia coli thioredoxin-S2 to 2.8 A resolution.Holmgren, A., Soderberg, B.O., Eklund, H., Branden, C.I.
(1975) Proc Natl Acad Sci U S A 72: 2305-2309
- PubMed: 1094461
- DOI: 10.1073/pnas.72.6.2305
- Structures With Same Primary Citation
- PubMed Abstract:
- Structure of Oxidized Thioredoxin to 4.5 Angstroms Resolution
Soderberg, B.-O., Holmgren, A., Branden, C.-I.
(1974) J Mol Biol 90: 143
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 ...
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.
Center for Molecular Biology of RNA and Department of Molecular, Cell and Developmental Biology, University of California at Santa Cruz, Santa Cruz, CA 95064, USA.