Method B
Method B was the Mg/NP-40 extraction method. This
method was performrd as described by Kim et al. (2001)
with some modifications. The powdered sample was
homogenized in 10 mL of ice-cold Mg/NP-40 extraction
buffer containing 0.5 mol L-1 Tris-HCl, pH 8.3, 2%
(v/v) NP-40, 20 mmol L-1 MgCl2, 2% (v/v) β-ME, 1 mmol
L-1 phenylmethylsulfonyl fluoride (PMSF) and 1% (w/v)
PVPP. The mixture was sonicated in ice bath for 10
min and shaken on ice for 30 min. After centrifugation
at 12 000 × g for 15 min at 4°C, proteins in the supernatant
were precipitated by adding 4 times volume of cold
acetone containing 10% TCA and 0.07% β-ME at
-20°C for at least 3 h. The precipitated proteins were
pelleted and washed with ice-cold acetone containing
0.07% β-ME. The treatment was repeated until the
supernatant was colorless. Pellets were vacuum-dried
and stored at -80°C.
Method BMethod B was the Mg/NP-40 extraction method. Thismethod was performrd as described by Kim et al. (2001)with some modifications. The powdered sample washomogenized in 10 mL of ice-cold Mg/NP-40 extractionbuffer containing 0.5 mol L-1 Tris-HCl, pH 8.3, 2%(v/v) NP-40, 20 mmol L-1 MgCl2, 2% (v/v) β-ME, 1 mmolL-1 phenylmethylsulfonyl fluoride (PMSF) and 1% (w/v)PVPP. The mixture was sonicated in ice bath for 10min and shaken on ice for 30 min. After centrifugationat 12 000 × g for 15 min at 4°C, proteins in the supernatantwere precipitated by adding 4 times volume of coldacetone containing 10% TCA and 0.07% β-ME at-20°C for at least 3 h. The precipitated proteins werepelleted and washed with ice-cold acetone containing0.07% β-ME. The treatment was repeated until thesupernatant was colorless. Pellets were vacuum-driedand stored at -80°C.
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