The bound crystallin was eluted with binding buffer containing imidazole Y-27632 mw in a step-gradient manner (100–500 mM). The crystallin protein peaks eluted with 250–350 mM imidazole were combined and dialyzed against buffer A (50 mM Tris–HCl, pH 8.0,

1 mM dithiothreitol, 50 mM NaCl, 5 mM MgCl2, 10% glycerol), followed by freezing at −70°C in a minimal aliquot. Protein concentrations were determined using a Bio-Rad protein assay kit with a bovine serum albumin (BSA) standard. To obtain anti-grouper crystallin rabbit polyclonal antibody, the (His)6-tagged crystallin were used to immunize two New Zealand White rabbits with a primary injection emulsified in Freund’s incomplete adjuvant at 1 mg/mL, and 1 mL was injected subcutaneously into two rabbits. The rabbits were boosted after 4, 8, and 12 weeks with the same amount of antigen in the adjuvant. The crystallin antibody was obtained after clotting overnight at 4°C

followed by centrifugation at 1200 rpm [26]. Healthy grouper eyes were crushed in liquid nitrogen and homogenized SCR7 price with 10% trichloroacetic acid and 0.07% β-mercaptoethanol in cold acetone. After centrifugation, each pellet was washed twice with cold acetone. Supernatants were discarded and the pellets were vacuum-dried to a protein powder. The powder was solubilized in 1 mL of lysis buffer [9.5 M urea, 2% (w/v) CHAPS, 0.8% (w/v) Pharmalyte pH 3–10, and 1% (w/v) dithiothreitol]. For isoelectric focusing, 50 μL of each sample was mixed with 300 μL of a rehydration solution Verteporfin [8 M urea, 2% (w/v) CHAPS, 0.8% (w/v), 15 mM dithiothreitol, and 0.5% (v/v) (Immobilized pH Gradient (IPG)-buffer pH 3–10)] to produce a final protein amount of 150 μg per sample. Isoelectric

focusing was performed using immobilized pH gradient strips. The IPG strips (13 cm, pH 3–10 NL) were rehydrated overnight at 50 V and focused for 3 h at 8000 V at 20 °C under mineral oil. Strips were then incubated for 10 min in equilibration buffer I [6 M urea, 30% (w/v) glycerol, 2% (w/v) sodium dodecyl sulfate (SDS), 1% (w/v) dithiothreitol in 0.05 M Tris–HCl buffer pH 8.8] following by incubation in equilibration buffer II [6 M urea, 30% (w/v) glycerol, 2% (w/v) SDS, and 4% (w/v) iodacetamide in 0.05 M Tris/HCl buffer pH 8.8]. After the equilibration steps the strips were transferred to a 22 cm×22 cm 10% SDS–polyacrylamide gel electrophoresis (SDS–PAGE) system. Electrophoresis in the second dimension was performed at 150 V and 150 mA at 20 °C for approximately 18 h [27]. Total RNA was isolated from post-hatch day 40–45 orange-spotted grouper, Epinephelus coioides, following the single-step acid guanidinium thiocyanate-phenol-chlorofrom extraction method [28]. Extracted cellular total RNA (5 μg) as template was incubated at 42 °C for 60 min in 20 μL of 1X reaction buffer containing 2 U Moloney murine leukemia virus (M-MLV) reverse transcriptase (Promega), 0.25 mM dNTP and 4 μM oligo(dT)15 primer, and 0.