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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cotranscription, deduced primary structure, and expression of the chloroplast-encoded rbcL and rbcS genes of the marine diatom Cylindrotheca sp. strain N1.

The primary structure of ribulose-1,5-bisphosphate carboxylase/oxygenase from the marine diatom Cylindrotheca sp. strain N1 has been determined. Unlike higher plants and green algae, the genes encoding the large and the small subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase are chloroplast-encoded and closely associated (Hwang and Tabita, 1989). The rbcL and rbcS genes in strain N1 are cotranscribed and are separated by an intergenic region of 46 nucleotide base pairs. Ribosome binding sites and a potential promoter sequence were highly homologous to previously determined chloroplast sequences. Comparison of the deduced primary structure of the diatom large and small subunits indicated significant homology to previously determined sequences from bacteria; there was much less homology to large and small subunits from cyanobacteria, green algae, and higher plants. Although high levels of recombinant diatom large subunits could be expressed in Escherichia coli, the protein synthesized was primarily insoluble and incapable of forming an active hexadecameric enzyme. Edman degradation studies indicated that the amino terminus of the large subunit isolated from strain N1 was blocked, suggesting that the mechanism responsible for processing and subsequent assembly of large and small subunits resembles the situation found with other eucaryotic ribulose-1,5-bisphosphate carboxylase/oxygenase proteins, despite the distinctive procaryotic gene arrangement and sequence homology.[1]


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