Extraction and analysis of chlorophyll a/b binding protein (LHCP)
Leaf tissue was ground in liquid N, and then the mixture was
homogenized in 10 volumes of buffer containing 50 mM Tris–HCl
(pH 8.0) and 5 mM EDTA. The homogenate was centrifuged at
10,000
×g at 4 ◦C for 10 min. The pellet was suspended in sample
buffer consisting of 50 mM Tris–HCl (pH 6.8), 2% SDS, 0.6% mercaptoethanol,
and 10% glycerol, and cooled on ice for 10 min. The
suspension was centrifuged twice at 12,000
×
g at 4 ◦C for 10 min,
and then the supernatant was heated for 5 min in boiling water, and
then cooled immediately on ice for 2 min. Proteins were separated
by SDS-PAGE using 15% polyacrylamide gel. The gel was transferred
into the solution containing 20% methanol and 7.5% acetic acid, and
incubated for 30 min. Proteins were visualized with Coomassie brilliant
blue-G250 (CBB-G250) by incubating the gel in the solution
containing 5% methanol and 7% acetic acid after staining the gel
in the solution containing 0.25% CBB-G250, 50% methanol, and 5%
acetic acid for 30 min.