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Ribosomal protein S12 mutant K42R in streptomycin-resistant E. coli. (A) The deconvoluted electrospray mass spectrum was observed to give a mass of 13,681 Da for the mutated S12. This was an increase of 29 Da from the predicted S12 mass. (B) Tandem MS/MS analysis of the 837.46-Da peptide in the mutated S12 was then performed. The fragments observed in the spectrum matched well with the predicted fragments (C) of the peptide VYTTTPR. Matches are indicated in bold.
