Disulfide Bond Isomerase DsbA

"DsbA is a bacterial disulfide oxidoreductase. DsbA is a key component of the Dsb (disulfide bond) family of enzymes. DsbA forms intrachain disulfide bonds as peptides emerge into the cell's periplasm."
--http://en.wikipedia.org/wiki/DsbA

This model is a cartoon representation of DsbA from _E. coli_. The catalytic cysteine residues are represented as spheres. The protein contains a thioredoxin fold. Based on PDB entry 1DSB:
http://www.rcsb.org/pdb/explore.do?structureId=1DSB

STL file c