Total protein extracts were prepared as previously described [36 (link)] employing a combination of phenol/acetone/TCA extraction. Digested peptides were measured using a 15 cm C18 Zorbax column (Agilent, Santa Clara, CA, USA), a Dionex Ultimate 3000 RSLC nano-UPLC system (Thermo Fisher, Waltham, MA, USA), a qTOF maXis Impact mass spectrometer (Bruker, Bremen, Germany), or the Orbitrap Fusion Lumos Tribrid Mass Spectrometer (Thermo Fisher) as described previously [37 (link),38 (link)].
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