(Steinheim, Germany). Acetic acid, 2-aminobenzoic acid (2-AA), 2-picoline
borane (2-PB), ammonium acetate, ammonium bicarbonate (ABC), bovine
serum albumin (BSA), cesium iodide, cytochrome C (cyt C), dimethyl
sulfoxide (DMSO), disodium hydrogen phosphate dihydrate, Tris (2-carboxyethyl)phosphine
hydrochloride (TCEP), chloroacetamide (CAA), dithiothreitol (DTT),
iodoacetamide (IAA), nonidet P-40 substitute (NP-40), potassium dihydrogen
phosphate, sodium chloride, super-DHB, and urea were obtained from
Sigma-Aldrich (Steinheim, Germany). Formic acid (FA) and 2-propanol
(IPA) were supplied by Riedel-De Haen (Seelze, Germany). The HPLC-grade
acetonitrile (ACN) was purchased from Biosolve (Valkenswaard, The
Netherlands). TrifluoroAcetic acid (TFA) was obtained from Merck (Darmstadt,
Germany). Recombinant Peptide-N-Glycosidase F (PNGase F) was purchased
from Roche Diagnostics or Promega. Milli-Q water was provided by Purelab
ultra (ELGA Labwater, Ede, The Netherlands). EndoPro purified fromAspergillus nigerwas provided by DSM formulated in
50% glycerol.