Fig. 5.

Mass spectrometry analysis of synthetic peptides corresponding to the COOH-terminal tail of human AQP2 did not detect any significant phosphorylation of the water channel by AMPK. Protease-treated peptides (trypsin or LysC) or full-length peptides are indicated with bold underlined amino acids, indicating where phosphorylation was detected. The no. in parentheses indicates the adjusted spectral count of that particular phosphorylation site. The adjusted spectral count is obtained by multiplying the spectral count of each site with its phosphorylated probability reported by PhosphoRS. The last column indicates the percent sequence coverage. SAMS peptide was used as a positive control.