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A, extracted ion chromatograms following incubation of FLRAPSWFDTG-NH2 and FLAPSWFDTG-NH2 (S = d-Ser) with MAPKAPK-2 reveal that d-Ser is not a viable phosphorylation substrate. B, relative degree of phosphorylation for Asp and Ser isomers of FLRAPSWFDTG-NH2. C, salt-bridge model (PDB 2YGD) of an N-terminal oligomeric interface involving Ser-59 and Asp-62. Hydrogen bonds are shown using dashed yellow lines.
