Animal was boosted three times, at 2 weeks intervals, with the same

amount of antigen. The obtained serum, containing anti-PbSP polyclonal antibodies was sampled and stored at -20°C. Preimmune serum was obtained. Obtaining cell extracts and secreted proteins of P. brasiliensis Total protein extracts from P. brasiliensis yeast cells was obtained [31]. Briefly, frozen cells (3 g) were disrupted by complete grinding with a mortar and pestle in buffer (20 mM Tris-HCl, pH 8.8, 2 mM CaCl2) without protease inhibitors. The mixture was centrifuged at 15,000 g at 4°C, for 20 min; the supernatant was sampled, and stored at -80°C. Culture supernatant of yeast cells was obtained after 8 h incubation in liquid MMcM minimal medium. The cells were separated by centrifugation selleck chemical at 5,000 g for 15 min and the supernatant was filtered in a 0.22 μm filter. The culture supernatants were dialyzed with water during 4 h at 4 ºC. Secreted protein fraction was concentrated with ice-cold acetone (v/v) during 16 h, centrifugated at 15,000 g for 15 min and the pellet was washed with 70% (v/v) ice-cold acetone. Each 50 mL of culture supernatant was concentrated to 500 μL in Tris-HCl 25 mM pH 7.0. Protein concentration of all the samples was measured by using Bradford reagent (Sigma Aldrich) using BSA

Selleckchem LXH254 as standard. Western blot analysis SDS-polyacrylamide gel electrophoresis (SDS-PAGE) was performed as described [32]. Proteins were electroblotted to a nylon membrane and transfer was checked by Pounce S staining. The membrane was blocked with 5% (w/v) non-fat dried milk in PBS 1× (pH 7.4). Serine protease was detected with the polyclonal antibody to the recombinant protein. After reaction with alkaline phosphatase anti-mouse immunoglobulin G (IgG), the reaction was developed

with 5-bromo-4-cloro-3-indolylphosphate-nitroblue tetrazolium (BCIP-NBT). Negative controls were obtained with preimmune serum. Glycosylation analysis The glycosylation analysis was performed as described [11]. Total protein extract from yeast cells was incubated with recombinant Aurora Kinase endoglycosidase H (Endo H) from Streptomyces plicatus (AICAR chemical structure Sigma-Aldrich), for 16 h at 37°C. The reaction mixture (100 μl) contained 30 μg of the protein extract and 27 mU Endo H in 60 mM sodium acetate buffer pH 5.8. Samples were analyzed by western-blot. Azocasein assay The azocasein assays were performed as described [33] with modifications. Azocasein was diluted to 5 mg/mL in buffer containing 25 mM Tris-HCl, 200 mM NaCl, 25 mM CaCl2, 0.05% (v/v) Nonidet P-40 and 0.01% (w/v) NaN3. A total of 150 μg of P. brasiliensis total protein extract were used in each assay, performed in triplicate.