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research-article

Expressed genes for plant-type ribulose 1,5-bisphosphate carboxylase/oxygenase in the photosynthetic bacterium Chromatium vinosum, which possesses two complete sets of the genes.

Research Institute for Biochemical Regulation, School of Agriculture, Nagoya University, Japan.

ABSTRACT

Two sets of genes for the large and small subunits of ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) were detected in the photosynthetic purple sulfur bacterium Chromatium vinosum by hybridization analysis with RuBisCO gene probes, cloned by using the lambda Fix vector, and designated rbcL-rbcS and rbcA-rbcB. rbcL and rbcA encode the large subunits, and rbcS and rbcB encode the small subunits. rbcL-rbcS was the same as that reported previously (A. M. Viale, H. Kobayashi, T. Takabe, and T. Akazawa, FEBS Lett. 192:283-288, 1985). A DNA fragment bearing rbcA-rbcB was subcloned in plasmid vectors and sequenced. We found that rbcB was located 177 base pairs downstream of the rbcA coding region, and both genes were preceded by plausible procaryotic ribosome-binding sites. rbcA and rbcD encoded polypeptides of 472 and 118 amino acids, respectively. Edman degradation analysis of the subunits of RuBisCO isolated from C. vinosum showed that rbcA-rbcB encoded the enzyme present in this bacterium. The large- and small-subunit polypeptides were posttranslationally processed to remove 2 and 1 amino acid residues from their N-termini, respectively. Among hetero-oligomeric RuBisCOs, the C. vinosum large subunit exhibited higher homology to that from cyanobacteria, eucaryotic algae, and higher plants (71.6 to 74.2%) than to that from the chemolithotrophic bacterium Alcaligenes eutrophus (56.6%). A similar situation has been observed for the C. vinosum small subunit, although the homology among small subunits from different organisms was lower than that among the large subunits.

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