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MS/MS spectra of S-acetyl-3-mercaptopropionic acid and S-acetyl-thioglycolic acid formed by acetyl-CoA synthetase (a), S-isobutyryl-3-mercaptopropionic acid, and S-isobutyryl-thioglycolic acid formed by AcsA (b) in the negative (N) ion mode. The theoretical m/z values of the fragments are given with the structures. The fragment ion at m/z 75 or m/z 103 suggests that each product is an S-acyl compound, respectively. CE, collision energy.
