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. 1985 Dec;164(3):1064–1070. doi: 10.1128/jb.164.3.1064-1070.1985

Isolation and characterization of Paracoccus denitrificans mutants with defects in the metabolism of one-carbon compounds.

N Harms, G E de Vries, K Maurer, E Veltkamp, A H Stouthamer
PMCID: PMC219298  PMID: 3905763

Abstract

Mutants deficient in the metabolism of one-carbon compounds have been obtained by treating Paracoccus denitrificans with the mutagen N-methyl-N'-nitro-N-nitrosoguanidine. Mutants were selected without enrichment procedures by newly developed plate screening tests. The obtained mutants were characterized by their growth responses, cytochrome composition, enzyme activities, and immunogenic reaction with antisera against methanol dehydrogenase. By these criteria five mutant classes could be distinguished. Class I mutants are involved in the expression of methanol dehydrogenase. Three mutants of this class have a defect in the structural gene. A double mutant was found with defects in the expression of both methanol dehydrogenase and hydrogenase. Class II mutants have a defect in a regulatory gene involved in the regulation of both methanol dehydrogenase and methylamine dehydrogenase. Class III mutants are deficient in formaldehyde metabolism. A defect may exist in the expression of a second non-NAD-linked formaldehyde dehydrogenase which was postulated to be involved in C1 metabolism. Class IV mutants are deficient in cytochrome c. Mutants of class V have a defect in synthesis of the molybdenum cofactor essential for the function of formate dehydrogenase.

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Selected References

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