How a protein binds B12: A 3.0 A X-ray structure of B12-binding domains of methionine synthase.
Drennan, C.L., Huang, S., Drummond, J.T., Matthews, R.G., Ludwig, M.L.(1994) Science 266: 1669-1674
- PubMed: 7992050 
- DOI: 10.1126/science.7992050
- Primary Citation of Related Structures:  
1BMT - PubMed Abstract: 
The crystal structure of a 27-kilodalton methylcobalamin-containing fragment of methionine synthase from Escherichia coli was determined at 3.0 A resolution. This structure depicts cobalamin-protein interactions and reveals that the corrin macrocycle lies between a helical amino-terminal domain and an alpha/beta carboxyl-terminal domain that is a variant of the Rossmann fold ...