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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 4.

Figure 4

Gel shift assay and intact mass analysis results for CTD5 before and after treatment with Erk2. A) wild-type or native sequence and B) all tyrosine residues (Tyr) were mutated to alanine (Ala). A portion of the mass spectra of the intact proteins is shown to illustrate the addition of phosphate groups upon treatment with Erk2.