Heterologous expression of the recombinant AtCBR
protein in insect cells. A, SDS-PAGE was performed using a 16%
polyacrylamide slab gel, and proteins were visualized by staining with
Coomassie brilliant blue R-250. Lane 1, Molecular mass marker proteins;
lane 2, 100,000g precipitate of mock-infected Sf21
cells; lane 3, 100,000g precipitate of the Sf21 cells
infected with the recombinant virus containing the full-length AtCBR
cDNA; lane 4, 100,000g supernatant of the
AtCBR-expressing Sf21 cells; lane 5, solubilized fractions of
100,000g precipitate of the AtCBR-expressing Sf21 cells;
lane 6, the purified recombinant AtCBR. B, Absolute absorption spectrum
of the purified recombinant AtCBR in its oxidized form (solid line) and
reduced by the addition of 100 μm NADH (dashed line).