HEWL, penta-N-acetylchitopentaose (NAG5), dithiotreithol (DTT), iodoacetamide, calmodulin, equine cytochrome c, horse heart myoglobin, melittin and ubiquitin were purchased from Sigma-Aldrich (Poole, UK). Trypsin and AspN were obtained from Promega (Southhampton, UK). Lys48 poly-ubiquitin ladder, wild-type USP5 and Lys48 diubiquitin were purchased from Boston Biochem (Cambridge, MA, USA). C335A USP5 was expressed and purified as previously described34 (link). Photoleucine 1 was purchased from Thermo Fisher Scientific, Loughborough, UK, and aryldiazirine 2 synthesized as described above.
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