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. 1980 Feb;141(2):652–657. doi: 10.1128/jb.141.2.652-657.1980

Presence of two subunit types in ribulose 1,5-bisphosphate carboxylase from Thiobacillus intermedius.

L H Bowman, R Chollet
PMCID: PMC293671  PMID: 7364715

Abstract

Ribulose bisphosphate carboxylase (EC 4.1.1.39) has been purified to homogeneity from glutamate-CO2-thiosulfate-grown Thiobacillus intermedius by pelleting the protein from the 93,000 X g supernatant fluid followed by ammonium sulfate fractionation and sedimentation into a discontinuous sucrose density gradient. The molecular weight of the native protein approximated that of the higher plant enzyme (550,000) based on its relative electrophoretic mobility in polyacrylamide disc gels compared with that of standards of known molecular weight, including crystalline tobacco ribulose bisphosphate carboxylase. Sodium dodecyl sulfate electrophoresis in 12% polyacrylamide disc gels and Sephadex G-100 chromatography in the presence of sodium dodecyl sulfate indicated that the purified Thiobacillus protein, like the tobacco enzyme, consisted of two types of nonidentical subunits. The molecular weights of the large and small subunits were estimated to be about 55,000 and 13,000, respectively, by means of sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The carboxylase activity of the protein purified from spinach leaves and T. intermedius responded similarly to the effectors reduced nicotinamide adenine dinucleotide phosphate and 6-phosphogluconate. Contrary to a previous report (K. Purohit, B. A. McFadden, and A. L. Cohen, J. Bacteriol. 127:505-515, 1976), these results indicate that ribulose bisphosphate carboxylase purified from Thiobacillus intermedius closely resembles the higher plant enzyme with respect to quaternary structure, molecular weight, and regulatory properties.

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Selected References

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