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Treatment of bovine brain myelin basic protein with 42-kDa mitogen-activated protein kinase [p42 MAPK or extracellular signal-regulated kinase 2 (ERK2)] in the presence of ATP and Mg2+ results in phosphorylation of Thr94 and Thr97. Thr94 is not previously known to be an ERK2 phosphorylation site. Both residues are phosphorylated to about the same extent and are in the highly conserved segment Asn91...
Human acidic proline-rich salivary protein PRP-1 and its C-terminally truncated form PRP-3 were analyzed by electrospray tandem mass spectrometry. Post-translational modifications were detected and characterized. A pyroglutamic acid residue was demonstrated at the N-terminus, Ser-8 and Ser-22 were shown to be phosphorylated and an O-linked glucuronic acid conjugation was identified. The latter modification...
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