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. 2016 Mar 7;27(2):61–74. doi: 10.7171/jbt.16-2702-002

Figure 9.

Figure 9.

Figure 9.

MS/MS analysis and identification of the Nt tryptic peptide-dimethyl SMEELEVR in sample 831MT_F (A) and sample 831MT_T (B). C) We show the representation of the experimental data that identified the fragment of FMRP in samples 831MT_T and 831MT_F. All green residues have been confirmed with >95% probability by the Scaffold FDR algorithm. There was only 1 tryptic peptides that identifies the Nt-dimethylation: peptide spanning aa 1–10 of the expressed protein. Expressed fragment of the FMR_1 protein has 33 lysine residues. Experimental data map 26 lysines; 11/26 lysines are found to be dimethylated (see mapped, green regions with “dimethyl lysines”); and nearly all are internal (miscleaved) lysines. D and E) Sequencing result (de novo), confirming Nt-dimethylated peptides SMEELVVEVR for samples 831MT_T and 831MT_F, respectively, that identified FMRP.