Figure 7: Proline-directed phosphorylation.
From: Quantitative maps of protein phosphorylation sites across 14 different rat organs and tissues
The fraction of localized phosphorylation sites that harbour a proline residue at the adjacent position +1 for six different cellular compartments (a) and for protein kinases and transcription factors (b) are depicted as histograms. The number of identified phosphorylation sites with a proline at position +1 for each category is indicated above the bars. Students t-test, ***P>0.001. (c) Amino-acid sequence pattern for phosphorylation sites on nuclear proteins with a proline at position +1 versus phosphorylation sites with a proline at position +1 on all non-nuclear proteins. (d) Amino-acid sequence pattern for phosphorylation sites on transcription factors compared with all other phosphorylation sites. ER, endoplasmic reticulum.
