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Electrophoretically homogeneous ribulose-1,5-bisphosphate (RuBP) carboxylase was obtained from autotropically grown Hydrogenomonas eutropha by sedimentation of the 105,000 X g supernatant in a discontinuous sucrose gradient and by ammonium sulfate fractionation followed by another sucrose gradient centrifugation. The molecular weight of the enzyme determined by light scattering was 490,000 +/- 15,000. The enzyme could be dissociated by sodium dodecyl sulfate into three types of subunits, and the molecular weights (+/- 10%) could be measured. There were two species of large subunits, L and L' (molecular weight 56,000 and 52,000, respectively) and one species of small subunits (molecular weight, 15,000). The mole ratio of L to L' was 5:3, and the overall mole ratio of the small to large subunits was 1.08. The simplest quaternary structure of the enzyme is L5L'3S8. The enzyme contained RuBP oxygenase activity as evidenced by the O2-dependent production of phosphoglycolate and 3-phosphoglyceric acid in equimolar quantities from RuBP.

Quaternary structure and oxygenase activity of D-ribulose-1,5-bisphosphate carboxylase from Hydrogenomonas eutropha