5NAL:
reference: Covalent Protein Labeling at Glutamic Acids., Martin-Gago P, Fansa EK, Winzker M, Murarka S, Janning P, Schultz-Fademrecht C, Baumann M, Wittinghofer A, Waldmann H, Cell Chem Biol. 2017 Apr 13. pii: S2451-9456(17)30098-3. doi:, 10.1016/j.chembiol.2017.03.015. PMID: 28434875

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