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  • Title: In vitro synthesis of the iron-molybdenum cofactor of nitrogenase.
    Author: Shah VK, Imperial J, Ugalde RA, Ludden PW, Brill WJ.
    Journal: Proc Natl Acad Sci U S A; 1986 Mar; 83(6):1636-40. PubMed ID: 3006060.
    Abstract:
    Molybdate- and ATP-dependent in vitro synthesis of the iron-molybdenum cofactor (FeMo-co) of nitrogenase requires the protein products of at least the nifB, nifN, and nifE genes. Extracts of FeMo-co-negative mutants of Klebsiella pneumoniae and Azotobacter vinelandii with lesions in different genes can be complemented for FeMo-co synthesis. Both K. pneumoniae and A. vinelandii dinitrogenase (component I) deficient in FeMo-co can be activated by FeMo-co synthesized in vitro. Properties of the partially purified dinitrogenase activated by FeMo-co synthesized in vitro were comparable to those of dinitrogenase from the wild-type organism; e.g., ratios of acetylene- to nitrogen-reduction activities, as well as those of acetylene reduction activities to EPR spectrum peak height at g = 3.65, were very similar. A. vinelandii mutants UW45 and CA30 have mutations in a gene functionally equivalent to nifB of K. pneumoniae.
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