The X-ray structure of a cobalamin biosynthetic enzyme, cobalt-precorrin-4 methyltransferase.Schubert, H.L., Wilson, K.S., Raux, E., Woodcock, S.C., Warren, M.J.
(1998) Nat Struct Biol 5: 585-592
- PubMed: 9665173
- DOI: https://doi.org/10.1038/846
- Primary Citation of Related Structures:
- PubMed Abstract:
Biosynthesis of the corrin ring of vitamin B12 requires the action of six S-adenosyl-L-methionine (AdoMet) dependent transmethylases, closely related in sequence. The first X-ray structure of one of these, cobalt-precorrin-4 transmethylase, CbiF, from Bacillus megaterium has been determined to a resolution of 2.4 A. CbiF contains two alphabeta domains forming a trough in which S-adenosyl-L-homocysteine (AdoHcy) binds. The location of AdoHcy and a number of conserved residues, helps define the precorrin binding site. A second crystal form determined at 3.1 A resolution highlights the flexibility of two loops around this site. CbiF employs a unique mode of AdoHcy binding and represents a new class of transmethylase.
Department of Chemistry, University of York, Heslington, UK.