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  • Title: The X-ray structure of a cobalamin biosynthetic enzyme, cobalt-precorrin-4 methyltransferase.
    Author: Schubert HL, Wilson KS, Raux E, Woodcock SC, Warren MJ.
    Journal: Nat Struct Biol; 1998 Jul; 5(7):585-92. PubMed ID: 9665173.
    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.
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