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Ribulosc bisphosphate carboxylase/oxygenase was purified to apparent homogeneity from the carboxysomes of Prochlorothrix hollandica.The MW of the native enzyme was estimated to be 560,000 Dalton, comprising large subunits (LSU) of 57,000 Dalton and small subunits (SSU) of 13,000, probably in an 8LSU8SSU quaternary structure. Enzyme activity was maximal at pH 8.0 at 30°C. The requirement of activity for Mg 2+  could not be replaced by Mn 2+ , Co 2+ , Ca 2+  or Cu 2+ .Amino acid N-terminal sequence analysis of the LSU showed a high degree of conservation when compared to cyanobacterial and chloroplast LSU sequences but was too short to allow a reliable phylogenetic assignment of P. hollandica.

zeitschrift für naturforschung c

The Ribulose Bisphosphate Carboxylase/Oxygenase of Prochlorothrix hollandica: Purification, Subunit Structure and Partial N-Terminal Sequence Analysis of the Large Subunit