METHIONINE LABELLING(STEADY STATE)
 

1. Grow an overnight culture of H103 (wildtype) in 10 ml of minimal medium containing 1/20 normal amount of sulfate.
2. Subculture the overnight 1/40 into fresh medium containing no sulfate.
3. Grow to OD₆₀₀ = 0.1-0.2.
4. Add unlabelled methionine to 1 mM (0.1 ml of 0.1 M stock of autoclaved unlabelled methionine into 10 ml of cells) and ³⁵S-methionine to a final concentration of 50 µCi/ml. Return cells to incubator.
5. To monitor uptake of label, remove 1 ml samples at 30 minute intervals, filter cells through 0.45 micron filters, wash twice with 0.1 M LiCl, dry and count filters.

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Updated 01 December 2000.