Download MendeleyStructural plasticity of the thioredoxin recognition site of yeast methionine S-sulfoxide reductase Mxr1
Ma, X.X., Guo, P.C., Shi, W.W., Luo, M., Tan, X.F., Chen, Y., Zhou, C.Z.(2011) J Biol Chem 286: 13430-13437
- PubMed: 21345799
- DOI: https://doi.org/10.1074/jbc.M110.205161
- Primary Citation of Related Structures:
3PIL, 3PIM, 3PIN - PubMed Abstract:
The methionine S-sulfoxide reductase MsrA catalyzes the reduction of methionine sulfoxide, a ubiquitous reaction depending on the thioredoxin system. To investigate interactions between MsrA and thioredoxin (Trx), we determined the crystal structures of yeast MsrA/Mxr1 in their reduced, oxidized, and Trx2-complexed forms, at 2.03, 1.90, and 2.70 Å, respectively. Comparative structure analysis revealed significant conformational changes of the three loops, which form a plastic "cushion" to harbor the electron donor Trx2. The flexible C-terminal loop enabled Mxr1 to access the methionine sulfoxide on various protein substrates. Moreover, the plasticity of the Trx binding site on Mxr1 provides structural insights into the recognition of diverse substrates by a universal catalytic motif of Trx.
Organizational Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, China.
