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. 2020 Jan 13;287(14):2979–2997. doi: 10.1111/febs.15190

Figure 6.

Figure 6

Amino acid length and localization of phosphorylation sites on the identified phosphopeptides. (A) Localization of the phosphorylation on unique phosphopeptides from EndoPro, showing the highly preferred phosphorylation on the second to last amino acid on the peptide (i.e., Ser‐Pro or Thr‐Pro), and the disfavor for phosphorylation on the penultimate N‐terminal amino acid on the EndoPro peptides. (B) Localization of phosphorylation on unique phosphopeptides following trypsin digestion at pH = 8.5, revealing a strong disfavor for phosphorylation on the ultimate and penultimate N‐terminal amino acids on the peptides, and preferential phosphorylation on the third amino acid of the identified phosphopeptides.