Protein of purified particles of phage
Bacteriophages particles by centrifugation through a glycerol step gradient were determined by Sambrook and Russell. (2001) after purified particles were subjected to SDS-PAGE on precast 4 to 15% gradient TRIS acrylamidegels (BioRad) along with protein molecular weight markers (Kropinski et al., 2012). The phage suspensions (approximately 1010 pfu/ml) were boiled for 5 min and separated by SDS-PAGE loading buffer (50 mM Tris-HCl, 3% SDS, 1% β-mercaptoethanol, 20% glycerol, 0.7% bromophenol blue pH 6.8) on 12.5% acrylamide gel. Electrophoresis was initiated at 80 V until samples had run through the stacking gel (approximately 30 min). The voltage was subsequently increased to 120 V and electrophoresis was continued until the tracking dye had reached the bottom of the gel (approximately 2 h). Proteins were stained with Coomassie Brilliant Blue R-250 (Sigma-Aldrich).