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L-Homocysteic acid is toxic to Escherichia coli K12. Sensitivity to this compound is higher in cells which can utilize glutamate as sole carbon source via the Na+-dependent glutamate transport system. Such cells become resistant by mutation at the gltS locus. Sensitivity of both wild-type and glutamate-utilizing strains is greater if cells are growing on acetate as compared with glucose as major carbon source.

Use of Homocysteic Acid for Selecting Mutants at the gltS Locus of Escherichia coli K12