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Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and a 66-kD protein were co-purified from solubilized microsomal preparations of the green alga Botryococcus braunii by Green A agarose, sucrose density gradient, MonoQ, and gel filtration. The 66-kD protein remained intact after 6 M urea treatment and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It could be detected in the soluble fraction of the cell-free extract but appeared to be more abundant in the microsomal preparations. It cross-reacted with antibodies raised against Rubisco holoenzyme, large and small subunits, indicating that the 66-kD protein contains both the large and the small subunits of Rubisco. The N-terminal amino acid sequence of this protein and that of a proteolytic fragment showed high homology with the mature Rubisco small subunits, and the sequence of another proteolytic fragment showed high homology with that of the Rubisco large subunit. It is concluded that the 66-kD protein is produced by cross-linking of large and small sub-units of Rubisco in the cell.

plant physiology

Isolation of a Protein Containing Covalently Linked Large and Small Subunits of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase from Botryococcus braunii