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The biosynthesis of the iron-molybdenum cofactor (FeMo-co) of nitrogenase was investigated using the purified in vitro FeMo-co synthesis system and 99 Mo. The purified system involves the addition of all components that are known to be required for FeMo-co synthesis in their purified forms. Here, we report the accumulation of a 99 Mo-containing FeMo-co precursor on NifNE. Apart from NifNE, NifH and NifX also accumulate 99 Mo label. We present evidence that suggests NifH may serve as the entrydoi:10.1074/jbc.m204581200 pmid:12176981 fatcat:nzssi5dcbza6nbqq7zqdr2fqyu