Location of Plum pox virus (PPV) capsid protein (CP) phosphorylated residues. (A) Collision‐induced dissociation‐tandem mass spectrometry (CID‐MS/MS) spectra corresponding to phosphorylated PPV CP peptides. (B) Scheme of PPV CP and its post‐translational modifications (PTMs). Distribution of phosphorylated residues (red ellipses) and previously mapped O‐GlcNAcylated amino acids (blue hexagons; Pérez et al., 2013). Trypsin/Lys‐C peptides in which the PTMs were identified are specified beneath the PPV CP map. Putative surface‐exposed N‐ and C‐terminal domains, as well as the protein core region, are shown on grey backgrounds. PPV CP domains are defined on the basis of predictions for other potyviral CPs (Baratova et al., 2001, 2004; Ivanov et al., 2003). Nt, N‐terminus; Ct, C‐terminus.