1srx
From Proteopedia
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THREE-DIMENSIONAL STRUCTURE OF ESCHERICHIA COLI THIOREDOXIN-S2 TO 2.8 ANGSTROMS RESOLUTION
Overview
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.
About this Structure
1SRX is a Single protein structure of sequence from Escherichia coli b. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of Escherichia coli thioredoxin-S2 to 2.8 A resolution., Holmgren A, Soderberg BO, Eklund H, Branden CI, Proc Natl Acad Sci U S A. 1975 Jun;72(6):2305-9. PMID:1094461
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