In a parallel series, the cells were lyzed at 4°C in a saline buffer TBS with the presence of protease inhibitors by passing trough a 20-gauge needle fitted to a 1 mL syringe during one minute.
73 These results shed new light on the drastic loss of activity observed for immobilized HbHNL after incubation in organic solvent saturated with buffer in the presence of phenylpropanal.
The biocatalysis reactions were conducted at 30 °C in phosphate buffer (pH 7.4) with the presence of 30 mM EDTA.
Cell extracts were obtained with RIPA buffer in the presence of protease inhibitors (sodium pyrophosphate, sodium fluoride, phenylmethanesulfonyl fluoride, pepstatin A, aprotinin, leupeptin, antipain, benzamidine - all from Sigma).
Cells were lysed with RIPA buffer in the presence of proteases and phosphatase inhibitor mixture.
Cells were then washed and permeabilized with BD Perm/Wash buffer in the presence of 10% mouse non-specific immune serum.
The sample (10 μg) was added with laemmli buffer in the presence of 2% β-mercaptoethanol and heated at 100°C for 5 min before loading into gel.
This protocol is still valid today: isoelectric focusing (IEF) is performed and after equilibration with SDS buffer in the presence of DTT, the IEF gel is applied to a SDS gel which allows the resolution of hundreds or even thousands of proteins present in a particular cell, while allowing synthesis rates to be determined quantitatively, all in one experiment.
Human H4 neuroglioma cells were washed with cold phosphate buffered saline (PBS) 36 hours post transfection cells, and lysed with NP-40 buffer in the presence of protease inhibitor cocktail (Roche, Mannheim, Germany).
The cell lysates extracted from ES cells treated with or without Y27632 at 10 µM for 24 hrs were incubated with kinase reaction buffer in the presence of ATP at 10 µM, and subsequently added to the substrate (recombinant myosin-binding subunit of myosin phosphatase, MBS, C terminus: 654 880 -coated multiwell plate.
