Structure of CcmG/DsbE at 1.14 A resolution: high-fidelity reducing activity in an indiscriminately oxidizing environment
Edeling, M.A., Guddat, L.W., Fabianek, R.A., Thony-Meyer, L., Martin, J.L.(2002) Structure 10: 973-979
- PubMed: 12121652 
- DOI: https://doi.org/10.1016/s0969-2126(02)00794-3
- Primary Citation of Related Structures:  
1KNG - PubMed Abstract: 
CcmG is unlike other periplasmic thioredoxin (TRX)-like proteins in that it has a specific reducing activity in an oxidizing environment and a high fidelity of interaction. These two unusual properties are required for its role in c-type cytochrome maturation. The crystal structure of CcmG reveals a modified TRX fold with an unusually acidic active site and a groove formed from two inserts in the fold. Deletion of one of the groove-forming inserts disrupts c-type cytochrome formation. Two unique structural features of CcmG-an acidic active site and an adjacent groove-appear to be necessary to convert an indiscriminately binding scaffold, the TRX fold, into a highly specific redox protein.
Organizational Affiliation: 
Centre for Drug Design and Development and Special Research Centre for Functional and Applied Genomics, Institute for Molecular Bioscience, Brisbane QLD 4072, Australia.