Abstract
For purifying carboxysomes of Thiobacillus neapolitanus an isolation procedure was developed which resulted in carboxysomes free from whole cells, protoplasts and cell fragments. These purified carboxysomes are composed of 8 proteins and at the most of 13 polypeptides. The two most abundant proteins which make up more than 60% of the carboxysomes, are ribulose-1,5-bisphosphate carboxylase and a glycoprotein with a molecular weight of 54,000. The shell of the carboxysomes consists of four glycoproteins, one also with a molecular weight of 54,000. The other proteins are present in minor quantities. Ribulose-1,5-bisphosphate carboxylase is the only enzyme which could be detected in the carboxysomes and 3-phosphoglycerate was the only product formed during incubation with ribulose-1,5-diphosphate and bicarbonate. The supernatant of a broken and centrifuged carboxysome suspension contained the large subunit of ribulose-1,5-bisphosphate carboxylase. The small subunit of ribulose-1,5-bisphosphate carboxylase was found in the pellet together with the shell proteins which indicates that the small subunit of ribulose-1,5-bisphosphate carboxylase is connected to the shell.
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Abbreviations
- RuBisCO:
-
ribulose-1,5-bisphosphate carboxylase
- PMSF:
-
phenylmethylsulfonyl fluoride
- PAA:
-
gelectrophoresis, polyacrylamide gelelectrophoresis
- SDS:
-
sodium dodecyl sulphate
- CIE:
-
crossed immunoelectrophoresis
- IEF:
-
isoelectric focusing
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Holthuijzen, Y.A., van Breemen, J.F.L., Kuenen, J.G. et al. Protein composition of the carboxysomes of Thiobacillus neapolitanus . Arch. Microbiol. 144, 398–404 (1986). https://doi.org/10.1007/BF00409891
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DOI: https://doi.org/10.1007/BF00409891