Figure 4From: Nonnatural amino acid incorporation into the methionine 214 position of the metzincin Pseudomonas aeruginosa alkaline proteasePositive ion mode electrospray mass spectrum of DFM-AprA. The calculated molecular weight of the labelled protein with the initiating residue was 49 702 Da, and without, 49 535 Da. Possible sodium adducts (2Na+) are seen for both species at 49 747 Da and 49 581 Da.Back to article page