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. Author manuscript; available in PMC: 2018 Jan 20.
Published in final edited form as: ACS Chem Biol. 2016 Dec 1;12(1):153–162. doi: 10.1021/acschembio.6b00729

Figure 1.

Figure 1

LC-MS base peak MS1 chromatogram and MS/MS spectra of unmodified yeast CTD heptads following digestion with trypsin and proteinase K. (A) LC-MS base peak MS1 chromatogram with peaks corresponding to the elution of unmodified heptad peptides (m/z 738) detected at time 13–14 min. (B and C) MS/MS (CID and UVPD) mass spectra acquired for protonated YSPTSPS. (D and E) MS/MS (CID and UVPD) mass spectra acquired for protonated SPSYSPT. Tyr side chain losses generated by UVPD are denoted m1 and m4 for YSPTSPS and SPSYSPT, respectively.